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Issue #15056: imp.cache_from_source() and source_from_cache() raise

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NotimplementedError when sys.implementation.cache_tag is None.

Thanks to Pranav Ravichandran for taking an initial stab at the patch.
This commit is contained in:
Brett Cannon 2012-07-09 13:58:07 -04:00
parent bf7eab077f
commit 19a2f5961c
6 changed files with 3875 additions and 3802 deletions
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18
Lib/test/test_imp.py
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@ -231,6 +231,8 @@ class PEP3147Tests(unittest.TestCase):
tag = imp.get_tag()
@unittest.skipUnless(sys.implementation.cache_tag is not None,
'requires sys.implementation.cache_tag not be None')
def test_cache_from_source(self):
# Given the path to a .py file, return the path to its PEP 3147
# defined .pyc file (i.e. under __pycache__).
@ -239,6 +241,12 @@ class PEP3147Tests(unittest.TestCase):
'qux.{}.pyc'.format(self.tag))
self.assertEqual(imp.cache_from_source(path, True), expect)
def test_cache_from_source_no_cache_tag(self):
# Non cache tag means NotImplementedError.
with support.swap_attr(sys.implementation, 'cache_tag', None):
with self.assertRaises(NotImplementedError):
imp.cache_from_source('whatever.py')
def test_cache_from_source_no_dot(self):
# Directory with a dot, filename without dot.
path = os.path.join('foo.bar', 'file')
@ -283,6 +291,9 @@ class PEP3147Tests(unittest.TestCase):
imp.cache_from_source('\\foo\\bar\\baz/qux.py', True),
'\\foo\\bar\\baz\\__pycache__\\qux.{}.pyc'.format(self.tag))
@unittest.skipUnless(sys.implementation.cache_tag is not None,
'requires sys.implementation.cache_tag to not be '
'None')
def test_source_from_cache(self):
# Given the path to a PEP 3147 defined .pyc file, return the path to
# its source. This tests the good path.
@ -291,6 +302,13 @@ class PEP3147Tests(unittest.TestCase):
expect = os.path.join('foo', 'bar', 'baz', 'qux.py')
self.assertEqual(imp.source_from_cache(path), expect)
def test_source_from_cache_no_cache_tag(self):
# If sys.implementation.cache_tag is None, raise NotImplementedError.
path = os.path.join('blah', '__pycache__', 'whatever.pyc')
with support.swap_attr(sys.implementation, 'cache_tag', None):
with self.assertRaises(NotImplementedError):
imp.source_from_cache(path)
def test_source_from_cache_bad_path(self):
# When the path to a pyc file is not in PEP 3147 format, a ValueError
# is raised.