test_import.py 文件源码

def test_issue3221(self):
        # Regression test for http://bugs.python.org/issue3221.
        def check_absolute():
            exec "from os import path" in ns
        def check_relative():
            exec "from . import relimport" in ns

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

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

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

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

        # Check both fail with package set to a non-string
        ns = dict(__package__=object())
        self.assertRaises(ValueError, check_absolute)
        self.assertRaises(ValueError, check_relative)