sys.stdin.read() returns empty string
I am on Python 3.5 inside Spyder 3.1.3. When I enter the following code, x has an empty string. I am not asked for any user input. Cursor directly goes to the next line
import sys
x = sys.stdin.read()
print(x)
So after executing this code, x = '' So what is happening here ?
python-3.x
asked Nov 20 '18 at 8:43
user9026user9026
114214
add a comment |
I am on Python 3.5 inside Spyder 3.1.3. When I enter the following code, x has an empty string. I am not asked for any user input. Cursor directly goes to the next line
import sys
x = sys.stdin.read()
print(x)
So after executing this code, x = '' So what is happening here ?
python-3.x
asked Nov 20 '18 at 8:43
user9026user9026
114214
add a comment |
I am on Python 3.5 inside Spyder 3.1.3. When I enter the following code, x has an empty string. I am not asked for any user input. Cursor directly goes to the next line
import sys
x = sys.stdin.read()
print(x)
So after executing this code, x = '' So what is happening here ?
python-3.x
asked Nov 20 '18 at 8:43
user9026user9026
114214
I am on Python 3.5 inside Spyder 3.1.3. When I enter the following code, x has an empty string. I am not asked for any user input. Cursor directly goes to the next line
import sys
x = sys.stdin.read()
print(x)
So after executing this code, x = '' So what is happening here ?
python-3.x
python-3.x
asked Nov 20 '18 at 8:43
user9026user9026
114214
asked Nov 20 '18 at 8:43
user9026user9026
114214
asked Nov 20 '18 at 8:43
user9026user9026
114214
asked Nov 20 '18 at 8:43
user9026user9026
114214
asked Nov 20 '18 at 8:43
user9026user9026
114214
114214
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
When the cursor jumps to the newline, it has started to read from stdin, so anything you type would be passed to variable x and then re-printed once you break out from stdin.
If you want user input you can use:
x = input('Say something: ')
answered Nov 20 '18 at 8:46
AdamAdam
32210
actually, when I run the program in the command prompt in windows, it does print the the value ofx, but inside the Spyder console, the cursor just goes to the next line without waiting for the input. and if I typexthere , it will just print an empty string
– user9026
Nov 20 '18 at 9:00
so it seems that the Spyder console does not behave like a system terminal. How can I have Spyder console behave like system terminal in windows ?
– user9026
Nov 20 '18 at 9:05
Sorry I don't know Spyder
– Adam
Nov 20 '18 at 9:13
add a comment |
The stdin and stdout are references to file descriptors for the host OS. You didn't state the system you were running on, however in Linux; any process that is a child of the initializing process would share the same stdin / stdout.
As an example, when running from the command line or terminal, you can pipe information into it.
echo "Say something: " | ./yourscript.py
yourscript.py
#!/usr/bin/python
import sys
for line in sys.stdin.readlines():
print('boom', line)
answered Nov 20 '18 at 9:22
Jimmy NewsomJimmy Newsom
361
so is Spyder console different from command prompt on windows ?
– user9026
Nov 20 '18 at 10:10
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
When the cursor jumps to the newline, it has started to read from stdin, so anything you type would be passed to variable x and then re-printed once you break out from stdin.
If you want user input you can use:
x = input('Say something: ')
answered Nov 20 '18 at 8:46
AdamAdam
32210
actually, when I run the program in the command prompt in windows, it does print the the value ofx, but inside the Spyder console, the cursor just goes to the next line without waiting for the input. and if I typexthere , it will just print an empty string
– user9026
Nov 20 '18 at 9:00
so it seems that the Spyder console does not behave like a system terminal. How can I have Spyder console behave like system terminal in windows ?
– user9026
Nov 20 '18 at 9:05
Sorry I don't know Spyder
– Adam
Nov 20 '18 at 9:13
add a comment |
When the cursor jumps to the newline, it has started to read from stdin, so anything you type would be passed to variable x and then re-printed once you break out from stdin.
If you want user input you can use:
x = input('Say something: ')
answered Nov 20 '18 at 8:46
AdamAdam
32210
actually, when I run the program in the command prompt in windows, it does print the the value ofx, but inside the Spyder console, the cursor just goes to the next line without waiting for the input. and if I typexthere , it will just print an empty string
– user9026
Nov 20 '18 at 9:00
so it seems that the Spyder console does not behave like a system terminal. How can I have Spyder console behave like system terminal in windows ?
– user9026
Nov 20 '18 at 9:05
Sorry I don't know Spyder
– Adam
Nov 20 '18 at 9:13
add a comment |
When the cursor jumps to the newline, it has started to read from stdin, so anything you type would be passed to variable x and then re-printed once you break out from stdin.
If you want user input you can use:
x = input('Say something: ')
answered Nov 20 '18 at 8:46
AdamAdam
32210
When the cursor jumps to the newline, it has started to read from stdin, so anything you type would be passed to variable x and then re-printed once you break out from stdin.
If you want user input you can use:
x = input('Say something: ')
answered Nov 20 '18 at 8:46
AdamAdam
32210
answered Nov 20 '18 at 8:46
AdamAdam
32210
answered Nov 20 '18 at 8:46
AdamAdam
32210
answered Nov 20 '18 at 8:46
AdamAdam
32210
32210
actually, when I run the program in the command prompt in windows, it does print the the value ofx, but inside the Spyder console, the cursor just goes to the next line without waiting for the input. and if I typexthere , it will just print an empty string
– user9026
Nov 20 '18 at 9:00
so it seems that the Spyder console does not behave like a system terminal. How can I have Spyder console behave like system terminal in windows ?
– user9026
Nov 20 '18 at 9:05
Sorry I don't know Spyder
– Adam
Nov 20 '18 at 9:13
add a comment |
actually, when I run the program in the command prompt in windows, it does print the the value ofx, but inside the Spyder console, the cursor just goes to the next line without waiting for the input. and if I typexthere , it will just print an empty string
– user9026
Nov 20 '18 at 9:00
so it seems that the Spyder console does not behave like a system terminal. How can I have Spyder console behave like system terminal in windows ?
– user9026
Nov 20 '18 at 9:05
Sorry I don't know Spyder
– Adam
Nov 20 '18 at 9:13
actually, when I run the program in the command prompt in windows, it does print the the value of
x, but inside the Spyder console, the cursor just goes to the next line without waiting for the input. and if I type x there , it will just print an empty string– user9026
Nov 20 '18 at 9:00
actually, when I run the program in the command prompt in windows, it does print the the value of
x, but inside the Spyder console, the cursor just goes to the next line without waiting for the input. and if I type x there , it will just print an empty string– user9026
Nov 20 '18 at 9:00
so it seems that the Spyder console does not behave like a system terminal. How can I have Spyder console behave like system terminal in windows ?
– user9026
Nov 20 '18 at 9:05
so it seems that the Spyder console does not behave like a system terminal. How can I have Spyder console behave like system terminal in windows ?
– user9026
Nov 20 '18 at 9:05
Sorry I don't know Spyder
– Adam
Nov 20 '18 at 9:13
Sorry I don't know Spyder
– Adam
Nov 20 '18 at 9:13
add a comment |
The stdin and stdout are references to file descriptors for the host OS. You didn't state the system you were running on, however in Linux; any process that is a child of the initializing process would share the same stdin / stdout.
As an example, when running from the command line or terminal, you can pipe information into it.
echo "Say something: " | ./yourscript.py
yourscript.py
#!/usr/bin/python
import sys
for line in sys.stdin.readlines():
print('boom', line)
answered Nov 20 '18 at 9:22
Jimmy NewsomJimmy Newsom
361
so is Spyder console different from command prompt on windows ?
– user9026
Nov 20 '18 at 10:10
add a comment |
The stdin and stdout are references to file descriptors for the host OS. You didn't state the system you were running on, however in Linux; any process that is a child of the initializing process would share the same stdin / stdout.
As an example, when running from the command line or terminal, you can pipe information into it.
echo "Say something: " | ./yourscript.py
yourscript.py
#!/usr/bin/python
import sys
for line in sys.stdin.readlines():
print('boom', line)
answered Nov 20 '18 at 9:22
Jimmy NewsomJimmy Newsom
361
so is Spyder console different from command prompt on windows ?
– user9026
Nov 20 '18 at 10:10
add a comment |
The stdin and stdout are references to file descriptors for the host OS. You didn't state the system you were running on, however in Linux; any process that is a child of the initializing process would share the same stdin / stdout.
As an example, when running from the command line or terminal, you can pipe information into it.
echo "Say something: " | ./yourscript.py
yourscript.py
#!/usr/bin/python
import sys
for line in sys.stdin.readlines():
print('boom', line)
answered Nov 20 '18 at 9:22
Jimmy NewsomJimmy Newsom
361
The stdin and stdout are references to file descriptors for the host OS. You didn't state the system you were running on, however in Linux; any process that is a child of the initializing process would share the same stdin / stdout.
As an example, when running from the command line or terminal, you can pipe information into it.
echo "Say something: " | ./yourscript.py
yourscript.py
#!/usr/bin/python
import sys
for line in sys.stdin.readlines():
print('boom', line)
answered Nov 20 '18 at 9:22
Jimmy NewsomJimmy Newsom
361
answered Nov 20 '18 at 9:22
Jimmy NewsomJimmy Newsom
361
answered Nov 20 '18 at 9:22
Jimmy NewsomJimmy Newsom
361
answered Nov 20 '18 at 9:22
Jimmy NewsomJimmy Newsom
361
361
so is Spyder console different from command prompt on windows ?
– user9026
Nov 20 '18 at 10:10
add a comment |
so is Spyder console different from command prompt on windows ?
– user9026
Nov 20 '18 at 10:10
so is Spyder console different from command prompt on windows ?
– user9026
Nov 20 '18 at 10:10
so is Spyder console different from command prompt on windows ?
– user9026
Nov 20 '18 at 10:10
add a comment |
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