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Issue #13591: import_module potentially imports a module twice.

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Meador Inge 2011-12-14 22:23:46 -06:00
parent 061c0289af
commit 416f12ddb3
4 changed files with 29 additions and 2 deletions
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17
Lib/importlib/test/test_api.py
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@ -67,6 +67,23 @@ class ImportModuleTests(unittest.TestCase):
importlib.import_module('.support')
def test_loaded_once(self):
# Issue #13591: Modules should only be loaded once when
# initializing the parent package attempts to import the
# module currently being imported.
b_load_count = 0
def load_a():
importlib.import_module('a.b')
def load_b():
nonlocal b_load_count
b_load_count += 1
code = {'a': load_a, 'a.b': load_b}
modules = ['a.__init__', 'a.b']
with util.mock_modules(*modules, module_code=code) as mock:
with util.import_state(meta_path=[mock]):
importlib.import_module('a.b')
self.assertEqual(b_load_count, 1)
def test_main():
from test.support import run_unittest
run_unittest(ImportModuleTests)