https://docs.python.org/3/library/functions.html#__import__
and 
https://docs.python.org/3/library/importlib.html#importlib.import_module
do not list which Exceptions are raised in case the module cannot be imported.

The two exceptions are listed here
https://docs.python.org/3/library/exceptions.html#ImportError
ModuleNotFoundError

Could you add a half-sentence "and raises an ModuleNotFoundError if import was unsuccessful." to the function docs?

ModuleNotFoundError is a subclass of ImportError, so it's probably enough to just document the functions as raising ImportError on failure, as in the case of https://docs.python.org/3/library/importlib.html#importlib.abc.Loader.load_module.

Thanks! I've opened a PR for this issue.

Note that importlib.import_module, and the import statement itself, can raise an arbitrary exception when that exception is raised while executing the module body.

This is easily observed by creating a module that just raises an error in its body:

# t.py
1/0
# EOF

``importlib.import_module("t")`` will raise ZeroDivisionError.

Oh, I didn't realize that. Then maybe we don't need to document ImportError in https://docs.python.org/3/library/importlib.html#importlib.import_module?

Good question. Hopefully one of the documentation or importlib experts can chime in about that.  I may also have uncovered a new issue in importlib ;-)

Personally I'd say that documenting raising ImportError is still useful because that's the common exception, and an exception that's not mentioned in the rest of the documentation for importlib.  That does require a careful formulation to avoid implying that this the only exception that can be raised.

Maybe we can add something like:

```
If the module cannot be imported,:exc:`ImportError` is usually raised.

.. note::
   
   Sometimes other errors are raised if the module cannot be imported successfully. See https://docs.python.org/3/library/exceptions.html for more information.

```

> ``importlib.import_module("t")`` will raise ZeroDivisionError.

I've tested ``__import__`` with the same code, and it will raise ZeroDivisionError too.

So.. maybe changing ``the module cannot be imported`` to ``the module is not found``?