diff options
Diffstat (limited to 'Lib/imp.py')
| -rw-r--r-- | Lib/imp.py | 5 |
1 files changed, 4 insertions, 1 deletions
@@ -58,9 +58,12 @@ def source_from_cache(path): The .pyc/.pyo file does not need to exist; this simply returns the path to the .py file calculated to correspond to the .pyc/.pyo file. If path does - not conform to PEP 3147 format, ValueError will be raised. + not conform to PEP 3147 format, ValueError will be raised. If + sys.implementation.cache_tag is None then NotImplementedError is raised. """ + if sys.implementation.cache_tag is None: + raise NotImplementedError('sys.implementation.cache_tag is None') head, pycache_filename = os.path.split(path) head, pycache = os.path.split(head) if pycache != _bootstrap._PYCACHE: |