Method assertStartsWith

Lib/unittest/case.py:1474–1487

(self, s, prefix, msg=None)

                            f'Expected bytes, not {type(s).__name__}'))

    def assertStartsWith(self, s, prefix, msg=None):
        try:
            if s.startswith(prefix):
                return
        except (AttributeError, TypeError):
            self._tail_type_check(s, prefix, msg)
            raise
        a = safe_repr(s, short=True)
        b = safe_repr(prefix)
        if isinstance(prefix, tuple):
            standardMsg = f"{a} doesn't start with any of {b}"
        else:
            standardMsg = f"{a} doesn't start with {b}"
        self.fail(self._formatMessage(msg, standardMsg))

    def assertNotStartsWith(self, s, prefix, msg=None):
        try: