function in textwrap (Expected type 'str', got 'set[int | object]' instead)

Question

I have this function, but I am getting this error. I have tried but am not able to fix this.

size -= len(prefix)
    if size % 2:
        size -= 1
    return '\n'.join([prefix + line for line in textwrap.wrap({size, string})])

Answer 1

It seems like you're trying to do something like this:

import textwrap

s = 'abcdefghijklmnopqrstuvwxyz'
prefix = '>>> '

desired_width = 15
width_without_prefix = desired_width - len(prefix)

print('\n'.join(prefix + l for l in textwrap.wrap(s, width_without_prefix)))

which returns:

>>> abcdefghijk
>>> lmnopqrstuv
>>> wxyz

However, you are passing {size, string} as a parameter to the textwrap.wrap method while the wrap method expects the first parameter to be a string:

textwrap.wrap(text, width=70, *, initial_indent='', subsequent_indent=''

To illustrate this we can check the type of the object you are passing (which is a set object):

v = {s, width_without_prefix}
print(type(v))

returns <class 'set'>.

As it happens, this can all be simplified if you use textwrap.fill instead of wrap:

print(textwrap.fill(s, initial_indent=prefix, subsequent_indent=prefix, width=desired_width))