How to avoid .pyc files?

python

Solution

From "What’s New in Python 2.6 - Interpreter Changes":

Python can now be prevented from writing .pyc or .pyo files by supplying the -B switch to the Python interpreter, or by setting the PYTHONDONTWRITEBYTECODE environment variable before running the interpreter. This setting is available to Python programs as the `sys.dont_write_bytecode` variable, and Python code can change the value to modify the interpreter’s behaviour.

So run your program as `python -B prog.py`.

Update 2010-11-27: Python 3.2 addresses the issue of cluttering source folders with `.pyc` files by introducing a special `__pycache__` subfolder, see What's New in Python 3.2 - PYC Repository Directories.

NOTE: The default behavior is to generate the bytecode and is done for "performance" reasons (for more information see here for python2 and see here for python3).

- The generation of bytecode .pyc files is a form of caching (i.e. greatly improves average performance).

- Configuring python with `PYTHONDONTWRITEBYTECODE=1` can be bad for python performance (for python2 see https://www.python.org/dev/peps/pep-0304/ and for python3 see https://www.python.org/dev/peps/pep-3147/ ).

- If you are interested in the performance impact please see here https://github.com/python/cpython .

Problem

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