python.py 文件源码

def __exit__(self, *tp):
        __tracebackhide__ = True
        if tp[0] is None:
            pytest.fail(self.message)
        if sys.version_info < (2, 7):
            # py26: on __exit__() exc_value often does not contain the
            # exception value.
            # http://bugs.python.org/issue7853
            if not isinstance(tp[1], BaseException):
                exc_type, value, traceback = tp
                tp = exc_type, exc_type(value), traceback
        self.excinfo.__init__(tp)
        return issubclass(self.excinfo.type, self.expected_exception)

# builtin pytest.approx helper