truthyish.py

#!/usr/bin/env python

from unittest import TestCase


def truthyish(value):
    """
    same as standard python truthyness except that strings are different.
    True, t, yes, y and 1 (case insensitive) are considered truthy.
    """
    if isinstance(value, str):
        return value.lower() in ('true', 't', 'yes', 'y', '1')
    else:
        return bool(value)


# python -m unittest truthyish
class TestTruthyish(TestCase):
    def test_truthyish(self):
        self.assertTrue(truthyish('t'))
        self.assertTrue(truthyish('T'))
        self.assertTrue(truthyish('true'))
        self.assertTrue(truthyish('True'))
        self.assertTrue(truthyish('TRUE'))
        self.assertTrue(truthyish('1'))
        self.assertTrue(truthyish('Y'))
        self.assertTrue(truthyish('y'))
        self.assertTrue(truthyish('yes'))
        self.assertTrue(truthyish('YES'))

    def test_falseyish(self):
        self.assertFalse(truthyish('f'))
        self.assertFalse(truthyish('F'))
        self.assertFalse(truthyish('false'))
        self.assertFalse(truthyish('False'))
        self.assertFalse(truthyish('FALSE'))
        self.assertFalse(truthyish('0'))
        self.assertFalse(truthyish('N'))
        self.assertFalse(truthyish('n'))
        self.assertFalse(truthyish('no'))
        self.assertFalse(truthyish('NO'))