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invalid-str-return-type (PLE0307)#

Derived from the Pylint linter.

What it does#

Checks for __str__ implementations that return a type other than str.

Why is this bad?#

The __str__ method should return a str object. Returning a different type may cause unexpected behavior.


class Foo:
    def __str__(self):
        return True

Use instead:

class Foo:
    def __str__(self):
        return "Foo"