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Home/ Questions/Q 6927493
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Editorial Team
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Editorial Team
Asked: May 27, 20262026-05-27T11:03:46+00:00 2026-05-27T11:03:46+00:00

I have a Python extension written in C and I wonder if I should

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I have a Python extension written in C and I wonder if I should use the file extension DLL or PYD under Windows. (And what would I use in Linux?)

Are there any differences (besides the filename)?

I found an unofficial article. Is this the secret of pyc?
Why can’t I find any official article on this topic?

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  1. Editorial Team
    Editorial Team
    2026-05-27T11:03:47+00:00Added an answer on May 27, 2026 at 11:03 am

    pyd files are just dll files ready for python importing.

    To distinguish them from normal dlls, I recommend .pyd not .dll in windows.

    Here is the official doc about this issue:

    http://docs.python.org/faq/windows.html#is-a-pyd-file-the-same-as-a-dll

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