test_import.py 文件源码

def test_issue3221(self):
        # Note for mergers: the 'absolute' tests from the 2.x branch
        # are missing in Py3k because implicit relative imports are
        # a thing of the past
        #
        # Regression test for http://bugs.python.org/issue3221.
        def check_relative():
            exec("from . import relimport", ns)

        # Check relative import OK with __package__ and __name__ correct
        ns = dict(__package__='test', __name__='test.notarealmodule')
        check_relative()

        # Check relative import OK with only __name__ wrong
        ns = dict(__package__='test', __name__='notarealpkg.notarealmodule')
        check_relative()

        # Check relative import fails with only __package__ wrong
        ns = dict(__package__='foo', __name__='test.notarealmodule')
        self.assertRaises(SystemError, check_relative)

        # Check relative import fails with __package__ and __name__ wrong
        ns = dict(__package__='foo', __name__='notarealpkg.notarealmodule')
        self.assertRaises(SystemError, check_relative)

        # Check relative import fails with package set to a non-string
        ns = dict(__package__=object())
        self.assertRaises(ValueError, check_relative)