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# 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
- requirements:
  - objspace.usepycfiles must be set to ‘True’

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.

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