| import imp |
| import os |
| import sys |
| |
| |
| def module_has_submodule(package, module_name): |
| """See if 'module' is in 'package'.""" |
| name = ".".join([package.__name__, module_name]) |
| if name in sys.modules: |
| return True |
| for finder in sys.meta_path: |
| if finder.find_module(name): |
| return True |
| for entry in package.__path__: # No __path__, then not a package. |
| try: |
| # Try the cached finder. |
| finder = sys.path_importer_cache[entry] |
| if finder is None: |
| # Implicit import machinery should be used. |
| try: |
| file_, _, _ = imp.find_module(module_name, [entry]) |
| if file_: |
| file_.close() |
| return True |
| except ImportError: |
| continue |
| # Else see if the finder knows of a loader. |
| elif finder.find_module(name): |
| return True |
| else: |
| continue |
| except KeyError: |
| # No cached finder, so try and make one. |
| for hook in sys.path_hooks: |
| try: |
| finder = hook(entry) |
| # XXX Could cache in sys.path_importer_cache |
| if finder.find_module(name): |
| return True |
| else: |
| # Once a finder is found, stop the search. |
| break |
| except ImportError: |
| # Continue the search for a finder. |
| continue |
| else: |
| # No finder found. |
| # Try the implicit import machinery if searching a directory. |
| if os.path.isdir(entry): |
| try: |
| file_, _, _ = imp.find_module(module_name, [entry]) |
| if file_: |
| file_.close() |
| return True |
| except ImportError: |
| pass |
| # XXX Could insert None or NullImporter |
| else: |
| # Exhausted the search, so the module cannot be found. |
| return False |
