I am reading out a file, calculate the ord-number which can be used together with the ord() function.
After that I unhexlify this number to get the byte representation of this character, because I work with non-ASCII characters and write these into a file.
Everything is working fine until I'm is reading out an "CR" better known as carriage return.
My Program raises the error:
Traceback (most recent call last):
File "C:\Users\#######", line xx:
x2 = binascii.unhexlify(format(Echr,"x"))
binascii.Error: Odd-length string
Do you got any idea why this error raises and how to fix this? Till now jut the CR is raising this error.
You are trying to pass an odd-length string to unhexlify, which can only handle hex characters in pairs.
If you produced your hex from an integer value in the range 0-255, make sure to pad your hex string with a 0:
x2 = binascii.unhexlify(format(Echr, "02x"))
The 02x formatted tells the format() function to fit your number in to a field of width 2, with leading zeros if the actual value is shorter:
>>> format(13, '02x')
'0d'
>>> binascii.unhexlify(format(10, '02x'))
'\r'
Using binascii.unhexlify together with format() is rather a roundabout way to create the bytes however. You can skip all that and go straight to the chr() function, which produces a character from an integer:
>>> chr(13)
'\r'