Python does not detect .pyc files

Question

I am using Python 3.2 (both for building and executing), and here is my question.

I intend to ship my python application with the following setup:

There is a main script (say, Main.py), that is using a compiled module, say Module1.pyc). To be precise, the directory structure is:

.Main.py
.__pycache__Module1.cpython-32.pyc

When I use the python interpreter to run the main script, it fails to find the module with the following error:

Traceback (most recent call last):
  File "Main.py", line 10, in <module>
    import Module1
ImportError: No module named Module1

Note that I have added the current directory to PYTHONPATH environment variable, and is part of sys.path. Also, the inner __pycache__ directory is also added, and is visible in sys.path.

Not sure why Module1 is not found. Am guessing, it could be because of the different file name – Module1.cpython-32.pyc? But, then that is how the Python 3.2 interpreter generates it.

Asked By: Kiran M N

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Source

Answer 1

Have a look at PEP-3147. They describe how the python-lookup mechanism works.

enter image description here

So in your concrete case: Put the file Module1.pyc directly in the root folder.

Answered By: gecco

Answer 2

As stated below, two steps resolved the issue:
Step 1: Copy the Module.cpython-32.pyc file from .__pycache__ directory to .
Step 2: Rename the file to Module.pyc

PS: Thanks to gecco for sharing the detail.

Answered By: Kiran M N

Answer 3

The problem is that python expects the foo.pyc files in the same directory as foo.py. In python3, the .pyc files have been moved to __pycache__/foo.pyc (or something similar).

You can compile all .py files and save them where they should be discovered using compileall:

python -m compileall -d ../ .

where -d ../ is an argument to save the .pyc files one level above __pycache__.

Answered By: anon01

Python does not detect .pyc files

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