cpython/Lib/test/test_importlib/import_
Brett Cannon b1611e2772 Issue #15767: Introduce ModuleNotFoundError, a subclass of
ImportError.

The exception is raised by import when a module could not be found.
Technically this is defined as no viable loader could be found for the
specified module. This includes ``from ... import`` statements so that
the module usage is consistent for all situations where import
couldn't find what was requested.

This should allow for the common idiom of::

  try:
    import something
  except ImportError:
    pass

to be updated to using ModuleNotFoundError and not accidentally mask
ImportError messages that should propagate (e.g. issues with a
loader).

This work was driven by the fact that the ``from ... import``
statement needed to be able to tell the difference between an
ImportError that simply couldn't find a module (and thus silence the
exception so that ceval can raise it) and an ImportError that
represented an actual problem.
2013-06-12 16:59:46 -04:00
..
__init__.py
test___loader__.py Normalize whitespace 2013-03-13 10:45:33 -07:00
test___package__.py
test_api.py Issue #15767: Introduce ModuleNotFoundError, a subclass of 2013-06-12 16:59:46 -04:00
test_caching.py
test_fromlist.py Issue #15767: Introduce ModuleNotFoundError, a subclass of 2013-06-12 16:59:46 -04:00
test_meta_path.py
test_packages.py
test_path.py Do a better job of preserving the state of sys.modules. 2012-11-20 17:10:10 -05:00
test_relative_imports.py
util.py