Convert True/False value read from file to boolean

Question

I\'m reading a True - False value from a file and I need to convert it to boolean. Currently it always converts it to True even if the value is set

Answer 1

you can use distutils.util.strtobool

>>> from distutils.util import strtobool

>>> strtobool('True')
1
>>> strtobool('False')
0

True values are y, yes, t, true, on and 1; False values are n, no, f, false, off and 0. Raises ValueError if val is anything else.

Answer 2

If you want to be case-insensitive, you can just do:

b = True if bool_str.lower() == 'true' else False

Example usage:

>>> bool_str = 'False'
>>> b = True if bool_str.lower() == 'true' else False
>>> b
False
>>> bool_str = 'true'
>>> b = True if bool_str.lower() == 'true' else False
>>> b
True

Answer 3

Using dicts to convert "True" in True:

def str_to_bool(s: str):
    status = {"True": True,
                "False": False}
    try:
        return status[s]
    except KeyError as e:
        #logging

Answer 4

You can use dict to convert string to boolean. Change this line flag = bool(reader[0]) to:

flag = {'True': True, 'False': False}.get(reader[0], False) # default is False

Answer 5

The cleanest solution that I've seen is:

from distutils.util import strtobool
def string_to_bool(string):
    return bool(strtobool(str(string)))

Sure, it requires an import, but it has proper error handling and requires very little code to be written (and tested).

Answer 6

pip install str2bool

>>> from str2bool import str2bool
>>> str2bool('Yes')
True
>>> str2bool('FaLsE')
False