importer which imports .py files only
Question: I need a Python <http://legacy.python.org/dev/peps/pep-0302/> finder and
importer class which works on a specific directory, but it can load only `.py`
files (i.e. no `.so`, no `.dll`, no `.pyc`).

The specified directory contains several packages (with `__path__` specified
and overridden from the default `__path__` added for `__init__.py`).

Also I need a loader which doesn't create `.pyc` files, and doesn't use any of
the Python 2.6-specific solutions (e.g. `sys.dont_write_bytecode = True`,
`python -B` or `PYTHONDONTWRITEBYTECODE`).


Answer: Since I couldn't find an existing implementation, I wrote one:
<https://github.com/pts/import_only_py/blob/master/import_only_py.py>

