What's the u prefix in a Python string?












170















Like in:



u'Hello'


My guess is that it indicates "Unicode", is it correct?



If so, since when is it available?










share|improve this question




















  • 34





    @S.Lott, Well is not always easy to spot the reference in the exact page and line, specially when you're new to a certain language. I find easier and faster to ask here. ( See: meta.stackexchange.com/questions/16353/… ) Btw, It's amazing how quick does google indexed this thread, it is now the third result: google.com/search?q=u+prefix+on+python

    – OscarRyz
    Mar 17 '10 at 19:02








  • 1





    @S.Lott: You're right. And now I know where that language reference is :)

    – OscarRyz
    Mar 17 '10 at 19:29






  • 12





    @OscarRyz is right. I made a google search for this 3 years later... and it got me to the answer with a sonic BOOM!

    – James Bedford
    Mar 29 '13 at 11:18






  • 17





    @JamesBedford, agreed. a search for "python u" came up with this result, which was just what I needed. The Python docs are great for the details, but locating something within them is a true, royal pain. A search for "u" on the python docs page returns a whole host of useless material. People who like to spout "read the docs" are ridiculously annoying, since searching the docs for something is so damn inefficient in the first place. If they weren't so bad at providing relevant results, that advice might be good.

    – Josh Brown
    Mar 19 '14 at 18:33






  • 2





    @S.Lott Google is my first resort. It found this page, which has the answer. Stackoverflow is far more reliable and understandable than any docs.

    – denson
    Jan 5 '17 at 15:40
















170















Like in:



u'Hello'


My guess is that it indicates "Unicode", is it correct?



If so, since when is it available?










share|improve this question




















  • 34





    @S.Lott, Well is not always easy to spot the reference in the exact page and line, specially when you're new to a certain language. I find easier and faster to ask here. ( See: meta.stackexchange.com/questions/16353/… ) Btw, It's amazing how quick does google indexed this thread, it is now the third result: google.com/search?q=u+prefix+on+python

    – OscarRyz
    Mar 17 '10 at 19:02








  • 1





    @S.Lott: You're right. And now I know where that language reference is :)

    – OscarRyz
    Mar 17 '10 at 19:29






  • 12





    @OscarRyz is right. I made a google search for this 3 years later... and it got me to the answer with a sonic BOOM!

    – James Bedford
    Mar 29 '13 at 11:18






  • 17





    @JamesBedford, agreed. a search for "python u" came up with this result, which was just what I needed. The Python docs are great for the details, but locating something within them is a true, royal pain. A search for "u" on the python docs page returns a whole host of useless material. People who like to spout "read the docs" are ridiculously annoying, since searching the docs for something is so damn inefficient in the first place. If they weren't so bad at providing relevant results, that advice might be good.

    – Josh Brown
    Mar 19 '14 at 18:33






  • 2





    @S.Lott Google is my first resort. It found this page, which has the answer. Stackoverflow is far more reliable and understandable than any docs.

    – denson
    Jan 5 '17 at 15:40














170












170








170


32






Like in:



u'Hello'


My guess is that it indicates "Unicode", is it correct?



If so, since when is it available?










share|improve this question
















Like in:



u'Hello'


My guess is that it indicates "Unicode", is it correct?



If so, since when is it available?







python syntax






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Oct 9 '17 at 18:51









Peter Mortensen

13.7k1986113




13.7k1986113










asked Mar 17 '10 at 18:43









OscarRyzOscarRyz

143k99338518




143k99338518








  • 34





    @S.Lott, Well is not always easy to spot the reference in the exact page and line, specially when you're new to a certain language. I find easier and faster to ask here. ( See: meta.stackexchange.com/questions/16353/… ) Btw, It's amazing how quick does google indexed this thread, it is now the third result: google.com/search?q=u+prefix+on+python

    – OscarRyz
    Mar 17 '10 at 19:02








  • 1





    @S.Lott: You're right. And now I know where that language reference is :)

    – OscarRyz
    Mar 17 '10 at 19:29






  • 12





    @OscarRyz is right. I made a google search for this 3 years later... and it got me to the answer with a sonic BOOM!

    – James Bedford
    Mar 29 '13 at 11:18






  • 17





    @JamesBedford, agreed. a search for "python u" came up with this result, which was just what I needed. The Python docs are great for the details, but locating something within them is a true, royal pain. A search for "u" on the python docs page returns a whole host of useless material. People who like to spout "read the docs" are ridiculously annoying, since searching the docs for something is so damn inefficient in the first place. If they weren't so bad at providing relevant results, that advice might be good.

    – Josh Brown
    Mar 19 '14 at 18:33






  • 2





    @S.Lott Google is my first resort. It found this page, which has the answer. Stackoverflow is far more reliable and understandable than any docs.

    – denson
    Jan 5 '17 at 15:40














  • 34





    @S.Lott, Well is not always easy to spot the reference in the exact page and line, specially when you're new to a certain language. I find easier and faster to ask here. ( See: meta.stackexchange.com/questions/16353/… ) Btw, It's amazing how quick does google indexed this thread, it is now the third result: google.com/search?q=u+prefix+on+python

    – OscarRyz
    Mar 17 '10 at 19:02








  • 1





    @S.Lott: You're right. And now I know where that language reference is :)

    – OscarRyz
    Mar 17 '10 at 19:29






  • 12





    @OscarRyz is right. I made a google search for this 3 years later... and it got me to the answer with a sonic BOOM!

    – James Bedford
    Mar 29 '13 at 11:18






  • 17





    @JamesBedford, agreed. a search for "python u" came up with this result, which was just what I needed. The Python docs are great for the details, but locating something within them is a true, royal pain. A search for "u" on the python docs page returns a whole host of useless material. People who like to spout "read the docs" are ridiculously annoying, since searching the docs for something is so damn inefficient in the first place. If they weren't so bad at providing relevant results, that advice might be good.

    – Josh Brown
    Mar 19 '14 at 18:33






  • 2





    @S.Lott Google is my first resort. It found this page, which has the answer. Stackoverflow is far more reliable and understandable than any docs.

    – denson
    Jan 5 '17 at 15:40








34




34





@S.Lott, Well is not always easy to spot the reference in the exact page and line, specially when you're new to a certain language. I find easier and faster to ask here. ( See: meta.stackexchange.com/questions/16353/… ) Btw, It's amazing how quick does google indexed this thread, it is now the third result: google.com/search?q=u+prefix+on+python

– OscarRyz
Mar 17 '10 at 19:02







@S.Lott, Well is not always easy to spot the reference in the exact page and line, specially when you're new to a certain language. I find easier and faster to ask here. ( See: meta.stackexchange.com/questions/16353/… ) Btw, It's amazing how quick does google indexed this thread, it is now the third result: google.com/search?q=u+prefix+on+python

– OscarRyz
Mar 17 '10 at 19:02






1




1





@S.Lott: You're right. And now I know where that language reference is :)

– OscarRyz
Mar 17 '10 at 19:29





@S.Lott: You're right. And now I know where that language reference is :)

– OscarRyz
Mar 17 '10 at 19:29




12




12





@OscarRyz is right. I made a google search for this 3 years later... and it got me to the answer with a sonic BOOM!

– James Bedford
Mar 29 '13 at 11:18





@OscarRyz is right. I made a google search for this 3 years later... and it got me to the answer with a sonic BOOM!

– James Bedford
Mar 29 '13 at 11:18




17




17





@JamesBedford, agreed. a search for "python u" came up with this result, which was just what I needed. The Python docs are great for the details, but locating something within them is a true, royal pain. A search for "u" on the python docs page returns a whole host of useless material. People who like to spout "read the docs" are ridiculously annoying, since searching the docs for something is so damn inefficient in the first place. If they weren't so bad at providing relevant results, that advice might be good.

– Josh Brown
Mar 19 '14 at 18:33





@JamesBedford, agreed. a search for "python u" came up with this result, which was just what I needed. The Python docs are great for the details, but locating something within them is a true, royal pain. A search for "u" on the python docs page returns a whole host of useless material. People who like to spout "read the docs" are ridiculously annoying, since searching the docs for something is so damn inefficient in the first place. If they weren't so bad at providing relevant results, that advice might be good.

– Josh Brown
Mar 19 '14 at 18:33




2




2





@S.Lott Google is my first resort. It found this page, which has the answer. Stackoverflow is far more reliable and understandable than any docs.

– denson
Jan 5 '17 at 15:40





@S.Lott Google is my first resort. It found this page, which has the answer. Stackoverflow is far more reliable and understandable than any docs.

– denson
Jan 5 '17 at 15:40












7 Answers
7






active

oldest

votes


















93














You're right, see 3.1.3. Unicode Strings.



It's been the syntax since Python 2.0.






share|improve this answer





















  • 1





    One should add that it is not necessary in Python 3 anymore, but still valid syntax.

    – Martin Thoma
    Nov 21 '18 at 8:31



















102














The u in u'Some String' means that your string is a Unicode string.



Q: I'm in a terrible, awful hurry and I landed here from Google Search. I'm trying to write this data to a file, I'm getting an error, and I need the dead simplest, probably flawed, solution this second.



A: You should really read Joel's Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!) essay on character sets.



Q: sry no time code pls



A: Fine. try str('Some String') or 'Some String'.encode('ascii', 'ignore'). But you should really read some of the answers and discussion on Converting a Unicode string and this excellent, excellent, primer on character encoding.






share|improve this answer





















  • 6





    This works if the string contains ASCII text only. In all other cases you'll have to explicitly encode.

    – Martijn Pieters
    Sep 13 '14 at 13:55






  • 2





    This treats the u'' as something "to get rid of". This tells me that you don't actually understand what it is. You generally do not just want to "get rid of" it, and the correct way to make a byte string from a Unicode string depends on what that string contains and in which context.

    – Lennart Regebro
    Dec 9 '14 at 12:32








  • 1





    @LennartRegebro totally agreed - this was a throwaway answer that was meant to be tongue in cheek, but it accumulated a sort of horrifying number of upvotes. edited to try to steer folks in the right direction.

    – Andrew
    Feb 5 '15 at 22:28





















47















My guess is that it indicates "Unicode", is it correct?




Yes.




If so, since when is it available?




Python 2.x.



In Python 3.x the strings use Unicode by default and there's no need for the u prefix. Note: in Python 3.0-3.2, the u is a syntax error. In Python 3.3+ it's legal again to make it easier to write 2/3 compatible apps.






share|improve this answer





















  • 7





    +1 For the 3.x note thank you

    – OscarRyz
    Mar 17 '10 at 18:47






  • 4





    It's even a Syntax Error in Python 3 to use the u prefix.

    – Tim Pietzcker
    Mar 17 '10 at 18:53






  • 12





    @TimPietzcker: Only in 3.0-3.2; in 3.3+ it's legal (and meaningless), to make it easier to write 2.6+/3.3+ single-codebase libraries and apps.

    – abarnert
    Sep 11 '14 at 23:59











  • @abarnert: Well, that comment is now four-and-a-half years old :)

    – Tim Pietzcker
    Sep 12 '14 at 7:59






  • 2





    @TimPietzcker: Sure, but just as your comment was a useful addendum for anyone finding this useful answer by search in 2010, I think it's useful to mention the change in 3.3 to anyone finding it in 2014. It might arguably be better to edit the answer, but I think it's a minor point that most people won't run into (because unless you're still using 3.0-3.2 in 2014, "no need for the prefix" is all you need to know).

    – abarnert
    Sep 12 '14 at 17:36



















2














The following should help:



http://docs.python.org/library/functions.html#unicode



http://www.amk.ca/python/howto/unicode (skip down to "Python's Unicode Support" if you're already familiar with Unicode principles)






share|improve this answer

































    2














    All strings meant for humans should use u"".



    I found that the following mindset helps a lot when dealing with Python strings: All Python manifest strings should use the u"" syntax. The "" syntax is for byte arrays, only.



    Before the bashing begins, let me explain. Most Python programs start out with using "" for strings. But then they need to support documentation off the Internet, so they start using "".decode and all of a sudden they are getting exceptions everywhere about decoding this and that - all because of the use of "" for strings. In this case, Unicode does act like a virus and will wreak havoc.



    But, if you follow my rule, you won't have this infection (because you will already be infected).






    share|improve this answer


























    • bash -c "echo Shouldn\'t you use b\"...\" for byte arrays?"

      – kennytm
      Mar 17 '10 at 19:06











    • @KennyTM Sounds good! Simply meant to say all strings meant for humans should use u"".

      – Frank Krueger
      Mar 17 '10 at 19:38











    • If you want to religiously use Unicode everywhere—which, for many applications (but not all), is a good thing—you almost certainly want Python 3.x, not 2.x. That may not have been true in 2010 when this was written, but in 2014, most libraries or platforms that prevent you from upgrading to 3.x will also prevent you from using Unicode properly…

      – abarnert
      Sep 12 '14 at 0:01



















    2














    It's Unicode.



    Just put the variable between str(), and it will work fine.



    But in case you have two lists like the following:



    a = ['co32','co36']
    b = [u'co32',u'co36']


    If you check set(a)==set(b), it will come as False, but if you do as follows:



    b = str(b)
    set(a)==set(b)


    Now, the result will be True.






    share|improve this answer


























    • Danger, danger. You should never encode a Unicode (str() or u'€'.encode()) without passing an encoding. If the string contains non-ASCII the user will receive a UnicodeEncodeException.

      – Alastair McCormack
      Dec 26 '16 at 17:21






    • 1





      Further, your code doesn't work. b = str(b) just gives the string repr() of the list, i.e. b = "[u'co32', u'co36']". Then set(a)==set(b) = False

      – Alastair McCormack
      Dec 26 '16 at 17:23





















    1














    I came here because I had funny-char-syndrome on my requests output. I thought response.text would give me a properly decoded string, but in the output I found funny double-chars where German umlauts should have been.



    Turns out response.encoding was empty somehow and so the response did not know how to properly decode the content and just treated it as ASCII (I guess).



    My solution was to get the raw bytes with 'response.content' and manually apply decode('utf_8') to it. The result was schöne Umlaute.



    The correctly decoded




    für




    vs. the improperly decoded




    fĂźr







    share|improve this answer























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      7 Answers
      7






      active

      oldest

      votes








      7 Answers
      7






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      93














      You're right, see 3.1.3. Unicode Strings.



      It's been the syntax since Python 2.0.






      share|improve this answer





















      • 1





        One should add that it is not necessary in Python 3 anymore, but still valid syntax.

        – Martin Thoma
        Nov 21 '18 at 8:31
















      93














      You're right, see 3.1.3. Unicode Strings.



      It's been the syntax since Python 2.0.






      share|improve this answer





















      • 1





        One should add that it is not necessary in Python 3 anymore, but still valid syntax.

        – Martin Thoma
        Nov 21 '18 at 8:31














      93












      93








      93







      You're right, see 3.1.3. Unicode Strings.



      It's been the syntax since Python 2.0.






      share|improve this answer















      You're right, see 3.1.3. Unicode Strings.



      It's been the syntax since Python 2.0.







      share|improve this answer














      share|improve this answer



      share|improve this answer








      edited Oct 9 '17 at 18:52









      Peter Mortensen

      13.7k1986113




      13.7k1986113










      answered Mar 17 '10 at 18:45









      Stefan KendallStefan Kendall

      41.5k56212370




      41.5k56212370








      • 1





        One should add that it is not necessary in Python 3 anymore, but still valid syntax.

        – Martin Thoma
        Nov 21 '18 at 8:31














      • 1





        One should add that it is not necessary in Python 3 anymore, but still valid syntax.

        – Martin Thoma
        Nov 21 '18 at 8:31








      1




      1





      One should add that it is not necessary in Python 3 anymore, but still valid syntax.

      – Martin Thoma
      Nov 21 '18 at 8:31





      One should add that it is not necessary in Python 3 anymore, but still valid syntax.

      – Martin Thoma
      Nov 21 '18 at 8:31













      102














      The u in u'Some String' means that your string is a Unicode string.



      Q: I'm in a terrible, awful hurry and I landed here from Google Search. I'm trying to write this data to a file, I'm getting an error, and I need the dead simplest, probably flawed, solution this second.



      A: You should really read Joel's Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!) essay on character sets.



      Q: sry no time code pls



      A: Fine. try str('Some String') or 'Some String'.encode('ascii', 'ignore'). But you should really read some of the answers and discussion on Converting a Unicode string and this excellent, excellent, primer on character encoding.






      share|improve this answer





















      • 6





        This works if the string contains ASCII text only. In all other cases you'll have to explicitly encode.

        – Martijn Pieters
        Sep 13 '14 at 13:55






      • 2





        This treats the u'' as something "to get rid of". This tells me that you don't actually understand what it is. You generally do not just want to "get rid of" it, and the correct way to make a byte string from a Unicode string depends on what that string contains and in which context.

        – Lennart Regebro
        Dec 9 '14 at 12:32








      • 1





        @LennartRegebro totally agreed - this was a throwaway answer that was meant to be tongue in cheek, but it accumulated a sort of horrifying number of upvotes. edited to try to steer folks in the right direction.

        – Andrew
        Feb 5 '15 at 22:28


















      102














      The u in u'Some String' means that your string is a Unicode string.



      Q: I'm in a terrible, awful hurry and I landed here from Google Search. I'm trying to write this data to a file, I'm getting an error, and I need the dead simplest, probably flawed, solution this second.



      A: You should really read Joel's Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!) essay on character sets.



      Q: sry no time code pls



      A: Fine. try str('Some String') or 'Some String'.encode('ascii', 'ignore'). But you should really read some of the answers and discussion on Converting a Unicode string and this excellent, excellent, primer on character encoding.






      share|improve this answer





















      • 6





        This works if the string contains ASCII text only. In all other cases you'll have to explicitly encode.

        – Martijn Pieters
        Sep 13 '14 at 13:55






      • 2





        This treats the u'' as something "to get rid of". This tells me that you don't actually understand what it is. You generally do not just want to "get rid of" it, and the correct way to make a byte string from a Unicode string depends on what that string contains and in which context.

        – Lennart Regebro
        Dec 9 '14 at 12:32








      • 1





        @LennartRegebro totally agreed - this was a throwaway answer that was meant to be tongue in cheek, but it accumulated a sort of horrifying number of upvotes. edited to try to steer folks in the right direction.

        – Andrew
        Feb 5 '15 at 22:28
















      102












      102








      102







      The u in u'Some String' means that your string is a Unicode string.



      Q: I'm in a terrible, awful hurry and I landed here from Google Search. I'm trying to write this data to a file, I'm getting an error, and I need the dead simplest, probably flawed, solution this second.



      A: You should really read Joel's Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!) essay on character sets.



      Q: sry no time code pls



      A: Fine. try str('Some String') or 'Some String'.encode('ascii', 'ignore'). But you should really read some of the answers and discussion on Converting a Unicode string and this excellent, excellent, primer on character encoding.






      share|improve this answer















      The u in u'Some String' means that your string is a Unicode string.



      Q: I'm in a terrible, awful hurry and I landed here from Google Search. I'm trying to write this data to a file, I'm getting an error, and I need the dead simplest, probably flawed, solution this second.



      A: You should really read Joel's Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!) essay on character sets.



      Q: sry no time code pls



      A: Fine. try str('Some String') or 'Some String'.encode('ascii', 'ignore'). But you should really read some of the answers and discussion on Converting a Unicode string and this excellent, excellent, primer on character encoding.







      share|improve this answer














      share|improve this answer



      share|improve this answer








      edited Oct 9 '17 at 18:56









      Peter Mortensen

      13.7k1986113




      13.7k1986113










      answered May 24 '13 at 18:55









      AndrewAndrew

      6,80883453




      6,80883453








      • 6





        This works if the string contains ASCII text only. In all other cases you'll have to explicitly encode.

        – Martijn Pieters
        Sep 13 '14 at 13:55






      • 2





        This treats the u'' as something "to get rid of". This tells me that you don't actually understand what it is. You generally do not just want to "get rid of" it, and the correct way to make a byte string from a Unicode string depends on what that string contains and in which context.

        – Lennart Regebro
        Dec 9 '14 at 12:32








      • 1





        @LennartRegebro totally agreed - this was a throwaway answer that was meant to be tongue in cheek, but it accumulated a sort of horrifying number of upvotes. edited to try to steer folks in the right direction.

        – Andrew
        Feb 5 '15 at 22:28
















      • 6





        This works if the string contains ASCII text only. In all other cases you'll have to explicitly encode.

        – Martijn Pieters
        Sep 13 '14 at 13:55






      • 2





        This treats the u'' as something "to get rid of". This tells me that you don't actually understand what it is. You generally do not just want to "get rid of" it, and the correct way to make a byte string from a Unicode string depends on what that string contains and in which context.

        – Lennart Regebro
        Dec 9 '14 at 12:32








      • 1





        @LennartRegebro totally agreed - this was a throwaway answer that was meant to be tongue in cheek, but it accumulated a sort of horrifying number of upvotes. edited to try to steer folks in the right direction.

        – Andrew
        Feb 5 '15 at 22:28










      6




      6





      This works if the string contains ASCII text only. In all other cases you'll have to explicitly encode.

      – Martijn Pieters
      Sep 13 '14 at 13:55





      This works if the string contains ASCII text only. In all other cases you'll have to explicitly encode.

      – Martijn Pieters
      Sep 13 '14 at 13:55




      2




      2





      This treats the u'' as something "to get rid of". This tells me that you don't actually understand what it is. You generally do not just want to "get rid of" it, and the correct way to make a byte string from a Unicode string depends on what that string contains and in which context.

      – Lennart Regebro
      Dec 9 '14 at 12:32







      This treats the u'' as something "to get rid of". This tells me that you don't actually understand what it is. You generally do not just want to "get rid of" it, and the correct way to make a byte string from a Unicode string depends on what that string contains and in which context.

      – Lennart Regebro
      Dec 9 '14 at 12:32






      1




      1





      @LennartRegebro totally agreed - this was a throwaway answer that was meant to be tongue in cheek, but it accumulated a sort of horrifying number of upvotes. edited to try to steer folks in the right direction.

      – Andrew
      Feb 5 '15 at 22:28







      @LennartRegebro totally agreed - this was a throwaway answer that was meant to be tongue in cheek, but it accumulated a sort of horrifying number of upvotes. edited to try to steer folks in the right direction.

      – Andrew
      Feb 5 '15 at 22:28













      47















      My guess is that it indicates "Unicode", is it correct?




      Yes.




      If so, since when is it available?




      Python 2.x.



      In Python 3.x the strings use Unicode by default and there's no need for the u prefix. Note: in Python 3.0-3.2, the u is a syntax error. In Python 3.3+ it's legal again to make it easier to write 2/3 compatible apps.






      share|improve this answer





















      • 7





        +1 For the 3.x note thank you

        – OscarRyz
        Mar 17 '10 at 18:47






      • 4





        It's even a Syntax Error in Python 3 to use the u prefix.

        – Tim Pietzcker
        Mar 17 '10 at 18:53






      • 12





        @TimPietzcker: Only in 3.0-3.2; in 3.3+ it's legal (and meaningless), to make it easier to write 2.6+/3.3+ single-codebase libraries and apps.

        – abarnert
        Sep 11 '14 at 23:59











      • @abarnert: Well, that comment is now four-and-a-half years old :)

        – Tim Pietzcker
        Sep 12 '14 at 7:59






      • 2





        @TimPietzcker: Sure, but just as your comment was a useful addendum for anyone finding this useful answer by search in 2010, I think it's useful to mention the change in 3.3 to anyone finding it in 2014. It might arguably be better to edit the answer, but I think it's a minor point that most people won't run into (because unless you're still using 3.0-3.2 in 2014, "no need for the prefix" is all you need to know).

        – abarnert
        Sep 12 '14 at 17:36
















      47















      My guess is that it indicates "Unicode", is it correct?




      Yes.




      If so, since when is it available?




      Python 2.x.



      In Python 3.x the strings use Unicode by default and there's no need for the u prefix. Note: in Python 3.0-3.2, the u is a syntax error. In Python 3.3+ it's legal again to make it easier to write 2/3 compatible apps.






      share|improve this answer





















      • 7





        +1 For the 3.x note thank you

        – OscarRyz
        Mar 17 '10 at 18:47






      • 4





        It's even a Syntax Error in Python 3 to use the u prefix.

        – Tim Pietzcker
        Mar 17 '10 at 18:53






      • 12





        @TimPietzcker: Only in 3.0-3.2; in 3.3+ it's legal (and meaningless), to make it easier to write 2.6+/3.3+ single-codebase libraries and apps.

        – abarnert
        Sep 11 '14 at 23:59











      • @abarnert: Well, that comment is now four-and-a-half years old :)

        – Tim Pietzcker
        Sep 12 '14 at 7:59






      • 2





        @TimPietzcker: Sure, but just as your comment was a useful addendum for anyone finding this useful answer by search in 2010, I think it's useful to mention the change in 3.3 to anyone finding it in 2014. It might arguably be better to edit the answer, but I think it's a minor point that most people won't run into (because unless you're still using 3.0-3.2 in 2014, "no need for the prefix" is all you need to know).

        – abarnert
        Sep 12 '14 at 17:36














      47












      47








      47








      My guess is that it indicates "Unicode", is it correct?




      Yes.




      If so, since when is it available?




      Python 2.x.



      In Python 3.x the strings use Unicode by default and there's no need for the u prefix. Note: in Python 3.0-3.2, the u is a syntax error. In Python 3.3+ it's legal again to make it easier to write 2/3 compatible apps.






      share|improve this answer
















      My guess is that it indicates "Unicode", is it correct?




      Yes.




      If so, since when is it available?




      Python 2.x.



      In Python 3.x the strings use Unicode by default and there's no need for the u prefix. Note: in Python 3.0-3.2, the u is a syntax error. In Python 3.3+ it's legal again to make it easier to write 2/3 compatible apps.







      share|improve this answer














      share|improve this answer



      share|improve this answer








      edited Mar 26 '18 at 17:39









      Jacinda

      3,42222035




      3,42222035










      answered Mar 17 '10 at 18:45









      kennytmkennytm

      406k80914920




      406k80914920








      • 7





        +1 For the 3.x note thank you

        – OscarRyz
        Mar 17 '10 at 18:47






      • 4





        It's even a Syntax Error in Python 3 to use the u prefix.

        – Tim Pietzcker
        Mar 17 '10 at 18:53






      • 12





        @TimPietzcker: Only in 3.0-3.2; in 3.3+ it's legal (and meaningless), to make it easier to write 2.6+/3.3+ single-codebase libraries and apps.

        – abarnert
        Sep 11 '14 at 23:59











      • @abarnert: Well, that comment is now four-and-a-half years old :)

        – Tim Pietzcker
        Sep 12 '14 at 7:59






      • 2





        @TimPietzcker: Sure, but just as your comment was a useful addendum for anyone finding this useful answer by search in 2010, I think it's useful to mention the change in 3.3 to anyone finding it in 2014. It might arguably be better to edit the answer, but I think it's a minor point that most people won't run into (because unless you're still using 3.0-3.2 in 2014, "no need for the prefix" is all you need to know).

        – abarnert
        Sep 12 '14 at 17:36














      • 7





        +1 For the 3.x note thank you

        – OscarRyz
        Mar 17 '10 at 18:47






      • 4





        It's even a Syntax Error in Python 3 to use the u prefix.

        – Tim Pietzcker
        Mar 17 '10 at 18:53






      • 12





        @TimPietzcker: Only in 3.0-3.2; in 3.3+ it's legal (and meaningless), to make it easier to write 2.6+/3.3+ single-codebase libraries and apps.

        – abarnert
        Sep 11 '14 at 23:59











      • @abarnert: Well, that comment is now four-and-a-half years old :)

        – Tim Pietzcker
        Sep 12 '14 at 7:59






      • 2





        @TimPietzcker: Sure, but just as your comment was a useful addendum for anyone finding this useful answer by search in 2010, I think it's useful to mention the change in 3.3 to anyone finding it in 2014. It might arguably be better to edit the answer, but I think it's a minor point that most people won't run into (because unless you're still using 3.0-3.2 in 2014, "no need for the prefix" is all you need to know).

        – abarnert
        Sep 12 '14 at 17:36








      7




      7





      +1 For the 3.x note thank you

      – OscarRyz
      Mar 17 '10 at 18:47





      +1 For the 3.x note thank you

      – OscarRyz
      Mar 17 '10 at 18:47




      4




      4





      It's even a Syntax Error in Python 3 to use the u prefix.

      – Tim Pietzcker
      Mar 17 '10 at 18:53





      It's even a Syntax Error in Python 3 to use the u prefix.

      – Tim Pietzcker
      Mar 17 '10 at 18:53




      12




      12





      @TimPietzcker: Only in 3.0-3.2; in 3.3+ it's legal (and meaningless), to make it easier to write 2.6+/3.3+ single-codebase libraries and apps.

      – abarnert
      Sep 11 '14 at 23:59





      @TimPietzcker: Only in 3.0-3.2; in 3.3+ it's legal (and meaningless), to make it easier to write 2.6+/3.3+ single-codebase libraries and apps.

      – abarnert
      Sep 11 '14 at 23:59













      @abarnert: Well, that comment is now four-and-a-half years old :)

      – Tim Pietzcker
      Sep 12 '14 at 7:59





      @abarnert: Well, that comment is now four-and-a-half years old :)

      – Tim Pietzcker
      Sep 12 '14 at 7:59




      2




      2





      @TimPietzcker: Sure, but just as your comment was a useful addendum for anyone finding this useful answer by search in 2010, I think it's useful to mention the change in 3.3 to anyone finding it in 2014. It might arguably be better to edit the answer, but I think it's a minor point that most people won't run into (because unless you're still using 3.0-3.2 in 2014, "no need for the prefix" is all you need to know).

      – abarnert
      Sep 12 '14 at 17:36





      @TimPietzcker: Sure, but just as your comment was a useful addendum for anyone finding this useful answer by search in 2010, I think it's useful to mention the change in 3.3 to anyone finding it in 2014. It might arguably be better to edit the answer, but I think it's a minor point that most people won't run into (because unless you're still using 3.0-3.2 in 2014, "no need for the prefix" is all you need to know).

      – abarnert
      Sep 12 '14 at 17:36











      2














      The following should help:



      http://docs.python.org/library/functions.html#unicode



      http://www.amk.ca/python/howto/unicode (skip down to "Python's Unicode Support" if you're already familiar with Unicode principles)






      share|improve this answer






























        2














        The following should help:



        http://docs.python.org/library/functions.html#unicode



        http://www.amk.ca/python/howto/unicode (skip down to "Python's Unicode Support" if you're already familiar with Unicode principles)






        share|improve this answer




























          2












          2








          2







          The following should help:



          http://docs.python.org/library/functions.html#unicode



          http://www.amk.ca/python/howto/unicode (skip down to "Python's Unicode Support" if you're already familiar with Unicode principles)






          share|improve this answer















          The following should help:



          http://docs.python.org/library/functions.html#unicode



          http://www.amk.ca/python/howto/unicode (skip down to "Python's Unicode Support" if you're already familiar with Unicode principles)







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Mar 8 '12 at 13:31









          Bill the Lizard

          295k157499792




          295k157499792










          answered Mar 17 '10 at 18:50









          Brian LuftBrian Luft

          1,065712




          1,065712























              2














              All strings meant for humans should use u"".



              I found that the following mindset helps a lot when dealing with Python strings: All Python manifest strings should use the u"" syntax. The "" syntax is for byte arrays, only.



              Before the bashing begins, let me explain. Most Python programs start out with using "" for strings. But then they need to support documentation off the Internet, so they start using "".decode and all of a sudden they are getting exceptions everywhere about decoding this and that - all because of the use of "" for strings. In this case, Unicode does act like a virus and will wreak havoc.



              But, if you follow my rule, you won't have this infection (because you will already be infected).






              share|improve this answer


























              • bash -c "echo Shouldn\'t you use b\"...\" for byte arrays?"

                – kennytm
                Mar 17 '10 at 19:06











              • @KennyTM Sounds good! Simply meant to say all strings meant for humans should use u"".

                – Frank Krueger
                Mar 17 '10 at 19:38











              • If you want to religiously use Unicode everywhere—which, for many applications (but not all), is a good thing—you almost certainly want Python 3.x, not 2.x. That may not have been true in 2010 when this was written, but in 2014, most libraries or platforms that prevent you from upgrading to 3.x will also prevent you from using Unicode properly…

                – abarnert
                Sep 12 '14 at 0:01
















              2














              All strings meant for humans should use u"".



              I found that the following mindset helps a lot when dealing with Python strings: All Python manifest strings should use the u"" syntax. The "" syntax is for byte arrays, only.



              Before the bashing begins, let me explain. Most Python programs start out with using "" for strings. But then they need to support documentation off the Internet, so they start using "".decode and all of a sudden they are getting exceptions everywhere about decoding this and that - all because of the use of "" for strings. In this case, Unicode does act like a virus and will wreak havoc.



              But, if you follow my rule, you won't have this infection (because you will already be infected).






              share|improve this answer


























              • bash -c "echo Shouldn\'t you use b\"...\" for byte arrays?"

                – kennytm
                Mar 17 '10 at 19:06











              • @KennyTM Sounds good! Simply meant to say all strings meant for humans should use u"".

                – Frank Krueger
                Mar 17 '10 at 19:38











              • If you want to religiously use Unicode everywhere—which, for many applications (but not all), is a good thing—you almost certainly want Python 3.x, not 2.x. That may not have been true in 2010 when this was written, but in 2014, most libraries or platforms that prevent you from upgrading to 3.x will also prevent you from using Unicode properly…

                – abarnert
                Sep 12 '14 at 0:01














              2












              2








              2







              All strings meant for humans should use u"".



              I found that the following mindset helps a lot when dealing with Python strings: All Python manifest strings should use the u"" syntax. The "" syntax is for byte arrays, only.



              Before the bashing begins, let me explain. Most Python programs start out with using "" for strings. But then they need to support documentation off the Internet, so they start using "".decode and all of a sudden they are getting exceptions everywhere about decoding this and that - all because of the use of "" for strings. In this case, Unicode does act like a virus and will wreak havoc.



              But, if you follow my rule, you won't have this infection (because you will already be infected).






              share|improve this answer















              All strings meant for humans should use u"".



              I found that the following mindset helps a lot when dealing with Python strings: All Python manifest strings should use the u"" syntax. The "" syntax is for byte arrays, only.



              Before the bashing begins, let me explain. Most Python programs start out with using "" for strings. But then they need to support documentation off the Internet, so they start using "".decode and all of a sudden they are getting exceptions everywhere about decoding this and that - all because of the use of "" for strings. In this case, Unicode does act like a virus and will wreak havoc.



              But, if you follow my rule, you won't have this infection (because you will already be infected).







              share|improve this answer














              share|improve this answer



              share|improve this answer








              edited Oct 9 '17 at 18:54









              Peter Mortensen

              13.7k1986113




              13.7k1986113










              answered Mar 17 '10 at 18:51









              Frank KruegerFrank Krueger

              44.9k41143198




              44.9k41143198













              • bash -c "echo Shouldn\'t you use b\"...\" for byte arrays?"

                – kennytm
                Mar 17 '10 at 19:06











              • @KennyTM Sounds good! Simply meant to say all strings meant for humans should use u"".

                – Frank Krueger
                Mar 17 '10 at 19:38











              • If you want to religiously use Unicode everywhere—which, for many applications (but not all), is a good thing—you almost certainly want Python 3.x, not 2.x. That may not have been true in 2010 when this was written, but in 2014, most libraries or platforms that prevent you from upgrading to 3.x will also prevent you from using Unicode properly…

                – abarnert
                Sep 12 '14 at 0:01



















              • bash -c "echo Shouldn\'t you use b\"...\" for byte arrays?"

                – kennytm
                Mar 17 '10 at 19:06











              • @KennyTM Sounds good! Simply meant to say all strings meant for humans should use u"".

                – Frank Krueger
                Mar 17 '10 at 19:38











              • If you want to religiously use Unicode everywhere—which, for many applications (but not all), is a good thing—you almost certainly want Python 3.x, not 2.x. That may not have been true in 2010 when this was written, but in 2014, most libraries or platforms that prevent you from upgrading to 3.x will also prevent you from using Unicode properly…

                – abarnert
                Sep 12 '14 at 0:01

















              bash -c "echo Shouldn\'t you use b\"...\" for byte arrays?"

              – kennytm
              Mar 17 '10 at 19:06





              bash -c "echo Shouldn\'t you use b\"...\" for byte arrays?"

              – kennytm
              Mar 17 '10 at 19:06













              @KennyTM Sounds good! Simply meant to say all strings meant for humans should use u"".

              – Frank Krueger
              Mar 17 '10 at 19:38





              @KennyTM Sounds good! Simply meant to say all strings meant for humans should use u"".

              – Frank Krueger
              Mar 17 '10 at 19:38













              If you want to religiously use Unicode everywhere—which, for many applications (but not all), is a good thing—you almost certainly want Python 3.x, not 2.x. That may not have been true in 2010 when this was written, but in 2014, most libraries or platforms that prevent you from upgrading to 3.x will also prevent you from using Unicode properly…

              – abarnert
              Sep 12 '14 at 0:01





              If you want to religiously use Unicode everywhere—which, for many applications (but not all), is a good thing—you almost certainly want Python 3.x, not 2.x. That may not have been true in 2010 when this was written, but in 2014, most libraries or platforms that prevent you from upgrading to 3.x will also prevent you from using Unicode properly…

              – abarnert
              Sep 12 '14 at 0:01











              2














              It's Unicode.



              Just put the variable between str(), and it will work fine.



              But in case you have two lists like the following:



              a = ['co32','co36']
              b = [u'co32',u'co36']


              If you check set(a)==set(b), it will come as False, but if you do as follows:



              b = str(b)
              set(a)==set(b)


              Now, the result will be True.






              share|improve this answer


























              • Danger, danger. You should never encode a Unicode (str() or u'€'.encode()) without passing an encoding. If the string contains non-ASCII the user will receive a UnicodeEncodeException.

                – Alastair McCormack
                Dec 26 '16 at 17:21






              • 1





                Further, your code doesn't work. b = str(b) just gives the string repr() of the list, i.e. b = "[u'co32', u'co36']". Then set(a)==set(b) = False

                – Alastair McCormack
                Dec 26 '16 at 17:23


















              2














              It's Unicode.



              Just put the variable between str(), and it will work fine.



              But in case you have two lists like the following:



              a = ['co32','co36']
              b = [u'co32',u'co36']


              If you check set(a)==set(b), it will come as False, but if you do as follows:



              b = str(b)
              set(a)==set(b)


              Now, the result will be True.






              share|improve this answer


























              • Danger, danger. You should never encode a Unicode (str() or u'€'.encode()) without passing an encoding. If the string contains non-ASCII the user will receive a UnicodeEncodeException.

                – Alastair McCormack
                Dec 26 '16 at 17:21






              • 1





                Further, your code doesn't work. b = str(b) just gives the string repr() of the list, i.e. b = "[u'co32', u'co36']". Then set(a)==set(b) = False

                – Alastair McCormack
                Dec 26 '16 at 17:23
















              2












              2








              2







              It's Unicode.



              Just put the variable between str(), and it will work fine.



              But in case you have two lists like the following:



              a = ['co32','co36']
              b = [u'co32',u'co36']


              If you check set(a)==set(b), it will come as False, but if you do as follows:



              b = str(b)
              set(a)==set(b)


              Now, the result will be True.






              share|improve this answer















              It's Unicode.



              Just put the variable between str(), and it will work fine.



              But in case you have two lists like the following:



              a = ['co32','co36']
              b = [u'co32',u'co36']


              If you check set(a)==set(b), it will come as False, but if you do as follows:



              b = str(b)
              set(a)==set(b)


              Now, the result will be True.







              share|improve this answer














              share|improve this answer



              share|improve this answer








              edited Oct 9 '17 at 18:58









              Peter Mortensen

              13.7k1986113




              13.7k1986113










              answered Dec 9 '14 at 12:28









              user3251882user3251882

              348414




              348414













              • Danger, danger. You should never encode a Unicode (str() or u'€'.encode()) without passing an encoding. If the string contains non-ASCII the user will receive a UnicodeEncodeException.

                – Alastair McCormack
                Dec 26 '16 at 17:21






              • 1





                Further, your code doesn't work. b = str(b) just gives the string repr() of the list, i.e. b = "[u'co32', u'co36']". Then set(a)==set(b) = False

                – Alastair McCormack
                Dec 26 '16 at 17:23





















              • Danger, danger. You should never encode a Unicode (str() or u'€'.encode()) without passing an encoding. If the string contains non-ASCII the user will receive a UnicodeEncodeException.

                – Alastair McCormack
                Dec 26 '16 at 17:21






              • 1





                Further, your code doesn't work. b = str(b) just gives the string repr() of the list, i.e. b = "[u'co32', u'co36']". Then set(a)==set(b) = False

                – Alastair McCormack
                Dec 26 '16 at 17:23



















              Danger, danger. You should never encode a Unicode (str() or u'€'.encode()) without passing an encoding. If the string contains non-ASCII the user will receive a UnicodeEncodeException.

              – Alastair McCormack
              Dec 26 '16 at 17:21





              Danger, danger. You should never encode a Unicode (str() or u'€'.encode()) without passing an encoding. If the string contains non-ASCII the user will receive a UnicodeEncodeException.

              – Alastair McCormack
              Dec 26 '16 at 17:21




              1




              1





              Further, your code doesn't work. b = str(b) just gives the string repr() of the list, i.e. b = "[u'co32', u'co36']". Then set(a)==set(b) = False

              – Alastair McCormack
              Dec 26 '16 at 17:23







              Further, your code doesn't work. b = str(b) just gives the string repr() of the list, i.e. b = "[u'co32', u'co36']". Then set(a)==set(b) = False

              – Alastair McCormack
              Dec 26 '16 at 17:23













              1














              I came here because I had funny-char-syndrome on my requests output. I thought response.text would give me a properly decoded string, but in the output I found funny double-chars where German umlauts should have been.



              Turns out response.encoding was empty somehow and so the response did not know how to properly decode the content and just treated it as ASCII (I guess).



              My solution was to get the raw bytes with 'response.content' and manually apply decode('utf_8') to it. The result was schöne Umlaute.



              The correctly decoded




              für




              vs. the improperly decoded




              fĂźr







              share|improve this answer




























                1














                I came here because I had funny-char-syndrome on my requests output. I thought response.text would give me a properly decoded string, but in the output I found funny double-chars where German umlauts should have been.



                Turns out response.encoding was empty somehow and so the response did not know how to properly decode the content and just treated it as ASCII (I guess).



                My solution was to get the raw bytes with 'response.content' and manually apply decode('utf_8') to it. The result was schöne Umlaute.



                The correctly decoded




                für




                vs. the improperly decoded




                fĂźr







                share|improve this answer


























                  1












                  1








                  1







                  I came here because I had funny-char-syndrome on my requests output. I thought response.text would give me a properly decoded string, but in the output I found funny double-chars where German umlauts should have been.



                  Turns out response.encoding was empty somehow and so the response did not know how to properly decode the content and just treated it as ASCII (I guess).



                  My solution was to get the raw bytes with 'response.content' and manually apply decode('utf_8') to it. The result was schöne Umlaute.



                  The correctly decoded




                  für




                  vs. the improperly decoded




                  fĂźr







                  share|improve this answer













                  I came here because I had funny-char-syndrome on my requests output. I thought response.text would give me a properly decoded string, but in the output I found funny double-chars where German umlauts should have been.



                  Turns out response.encoding was empty somehow and so the response did not know how to properly decode the content and just treated it as ASCII (I guess).



                  My solution was to get the raw bytes with 'response.content' and manually apply decode('utf_8') to it. The result was schöne Umlaute.



                  The correctly decoded




                  für




                  vs. the improperly decoded




                  fĂźr








                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Nov 14 '17 at 16:14









                  ChrisChris

                  1,80311323




                  1,80311323






























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                      Why https connections are so slow when debugging (stepping over) in Java?