Method assertIs

Lib/unittest/case.py:1201–1206

Just like self.assertTrue(a is b), but with a nicer default message.

(self, expr1, expr2, msg=None)

            self.fail(self._formatMessage(msg, standardMsg))

    def assertIs(self, expr1, expr2, msg=None):
        """Just like self.assertTrue(a is b), but with a nicer default message."""
        if expr1 is not expr2:
            standardMsg = '%s is not %s' % (safe_repr(expr1),
                                             safe_repr(expr2))
            self.fail(self._formatMessage(msg, standardMsg))

    def assertIsNot(self, expr1, expr2, msg=None):
        """Just like self.assertTrue(a is not b), but with a nicer default message."""