__init__.py 文件源码

def to_python(self, value):
        if value is None:
            return None
        if value in (True, False):
            return bool(value)
        if value in ('None',):
            return None
        if value in ('t', 'True', '1'):
            return True
        if value in ('f', 'False', '0'):
            return False
        raise exceptions.ValidationError(
            self.error_messages['invalid'],
            code='invalid',
            params={'value': value},
        )