invalid-str-returned.md

Pattern: __str__ does not return string

Issue: -

Description

Used when a __str__ method returns something which is not a string.

Example of incorrect code:

class BadStr(object):
    """ __str__ returns bytes """

    def __str__(self):  # [invalid-str-returned]
        return b"123"

Example of correct code:

class GoodStr(object):
    """__str__ returns <type 'str'>"""

    def __str__(self):
        return "some str"