===================== objspace.lonepycfiles ===================== * **name:** lonepycfiles * **description:** Import pyc files with no matching py file * **command-line:** --objspace-lonepycfiles * **command-line for negation:** --no-objspace-lonepycfiles * **option type:** boolean option * **default:** False If turned on, PyPy accepts to import a module ``x`` if it finds a file ``x.pyc`` even if there is no file ``x.py``. This is the way that CPython behaves, but it is disabled by default for PyPy because it is a common cause of issues: most typically, the ``x.py`` file is removed (manually or by a version control system) but the ``x`` module remains accidentally importable because the ``x.pyc`` file stays around. The usual reason for wanting this feature is to distribute non-open-source Python programs by distributing ``pyc`` files only, but this use case is not practical for PyPy at the moment because multiple versions of PyPy compiled with various optimizations might be unable to load each other's ``pyc`` files.