Agfdhyk

I look some solution in this site but those not works in python 3.7.
So, I asked a new question.

Hex string of "the" is "746865"

I want to a solution to convert "the" to "746865" and "746865" to "the"

    #!/usr/bin/python3

    """

    Program name:  txt_to_ASC.py



    The program transfers

    a string of letters -> the corresponding

      string of hexadecimal ASCII-codes,

    eg.  the -> 746865



    Only letters in [abc...xyzABC...XYZ] should be input.



    """

    print("Transfer letters to hex ASCII-codes")

    print("Input range is [abc...xyzABC...XYZ].")

    print()

    string = input("Input set of letters, eg. the: ")

    print("hex ASCII-code: " + " "*15, end = "")



    def str_to_hasc(x):

        global glo



        byt = bytes(x, 'utf-8')

        bythex = byt.hex()



        for b1 in bythex:

            y = print(b1, end = "")

            glo = str(y)

        return glo



    str_to_hasc(string)

Given that your string contains ascii only (each char is in range 0-0xff), you can use the following snippet:

In [28]: s = '746865'



In [29]: import math



In [30]: int(s, base=16).to_bytes(math.ceil(len(s) / 2), byteorder='big').decode('ascii')

Out[30]: 'the'

Firstly you need to convert a string into integer with base of 16, then convert it to bytes (assuming 2 chars per byte) and then convert bytes back to string using decode

If you have a byte string, then:

>>> import binascii

>>> binascii.hexlify(b'the')

b'746865'

If you have a Unicode string, you can encode it:

>>> s = 'the'

>>> binascii.hexlify(s)

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

TypeError: a bytes-like object is required, not 'str'

>>> binascii.hexlify(s.encode())

b'746865'

The result is a byte string, you can decode it to get a Unicode string:

>>> binascii.hexlify(s.encode()).decode()

'746865'

The reverse, of course, is:

>>> binascii.unhexlify(b'746865')

b'the'

    #!/usr/bin/python3

    """

    Program name:  ASC_to_txt.py

    The program's input is a string of hexadecimal digits.

    The string is a bytes object, and each byte is supposed to be

    the hex ASCII-code of a (capital or small) letter.



    The program's output is the string of the corresponding letters.



    Example

    Input:            746865

    First subresult:  ['7','4','6','8','6','5']

    Second subresult: ['0x74', '0x68', '0x65']

    Third subresult:  [116, 104, 101]

    Final result:     the



    References

    Contribution by alhelal to stackoverflow.com (20180901)

    Contribution by QintenG to stackoverflow.com (20170104)

    Mark Pilgrim, Dive into Python 3, section 4.6

    """

    import string



    print("The program converts a string of hex ASCII-codes")

    print("into the corresponding string of letters.")

    print("Input range is [41, 42, ..., 5a] U [61, 62, ..., 7a]. n")

    x = input("Input the hex ASCII-codes, eg. 746865: ")



    result_1 = 

    for i in range(0,len(x)//2):

        for j in range(0,2):

            result_1.extend(x[2*i+j])

            # First subresult



    lenres_1 = len(result_1)



    result_2 = 

    for i in range(0,len(result_1) - 1,2):

        temp = ""

        temp = temp + "0x" + result_1[i]      #0, 2, 4

        temp = temp +        result_1[i + 1]  #1, 3, 5

        result_2.append(temp)

        # Second subresult



    result_3 = 

    for i in range(0,len(result_2)):

        result_3.append(int(result_2[i],16))

        # Third subresult



    by = bytes(result_3)

    result_4 = by.decode('utf-8')

    # Final result



    print("Corresponding string of letters:" + " "*6, result_4, end = "n")