importlib.__import__() now raises ValueError when level < 0.

This is to bring it more in line with what PEP 328 set out to do with
removing ambiguous absolute/relative import semantics.

1 files changed, 7 insertions, 0 deletions

diff --git a/Lib/importlib/test/import_/test_api.py b/Lib/importlib/test/import_/test_api.py
index 9075d42..2fa1f90 100644
--- a/Lib/importlib/test/import_/test_api.py
+++ b/Lib/importlib/test/import_/test_api.py
@@ -12,6 +12,13 @@ class APITest(unittest.TestCase):
         with self.assertRaises(TypeError):
             util.import_(42)
 
+    def test_negative_level(self):
+        # Raise ValueError when a negative level is specified.
+        # PEP 328 did away with sys.module None entries and the ambiguity of
+        # absolute/relative imports.
+        with self.assertRaises(ValueError):
+            util.import_('os', globals(), level=-1)
+
 
 def test_main():
     from test.support import run_unittest