TypeError: a bytes-like object is required, not 'str' when writing to a file in Python3

Question

I\'ve very recently migrated to Py 3.5. This code was working properly in Python 2.7:

with open(fname, \'rb\') as f:
    lines = [x.strip() for x in f.readli         


        

Answer 1

Like it has been already mentioned, you are reading the file in binary mode and then creating a list of bytes. In your following for loop you are comparing string to bytes and that is where the code is failing.

Decoding the bytes while adding to the list should work. The changed code should look as follows:

with open(fname, 'rb') as f:
    lines = [x.decode('utf8').strip() for x in f.readlines()]

The bytes type was introduced in Python 3 and that is why your code worked in Python 2. In Python 2 there was no data type for bytes:

>>> s=bytes('hello')
>>> type(s)