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Asked: 2026-05-31T09:25:24+00:00

I saw some there are some typedef in CPython as shown below, what does

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I saw some there are some typedef in CPython as shown below, what does ty mean in the type name? A short form of type?

typedef struct _mod *mod_ty;
typedef struct _stmt *stmt_ty;
typedef struct _expr *expr_ty;
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  1. Editorial Team

    Given that it’s a typedef and the new type is simply the structure name with _ty appended, I think you’ve hit the nail on the head.

    It’s just a short form of type so that you can instantly tell that a variable of type xyzzy_ty is simply a pointer to a variable of type struct _xyyzy.

    The rules you follow for this sort of thing aren’t set in stone but it’s useful to be consistent.

    PEP7 is the style guideline for CPython C source code, similar to PEP8 for the Python source code.

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