咨询NumPy中arange与array函数的源码定义位置

Hey there, let's clear up where to find these two functions in NumPy's codebase—your initial search probably missed them because a lot of NumPy's core functionality lives in C extensions, not pure Python files.

arange #

• Core C implementation: The main logic for generating the range array lives in numpy/core/src/multiarray/ctors.c, in the C function PyArray_Arange. This is where the actual value calculation and array allocation happens.
• Python wrapper/entry point: You won't spot a straightforward def arange in most Python files under numpy/core because arange is exported directly from the C extension module numpy.core.multiarray. There is a thin wrapper in numpy/core/fromnumeric.py that handles argument parsing and routes calls to the C implementation, but it's not the primary definition.

array #

• Python user-facing definition: The array function you call in Python is explicitly defined with def array(...) in numpy/core/array.py. This layer takes care of input validation, handling different argument types, and preparing data for the lower-level code.
• Core C implementation: The heavy lifting of creating the array from input data is done by the C function PyArray_FromAny, which lives in numpy/core/src/multiarray/ctors.c—the Python array function calls this under the hood.

Why your initial GitHub search didn't work #

When you searched for "def arange" path:numpy/core, you came up empty because arange isn't defined with a pure Python def in that directory. It's a C-implemented function that's exposed to Python via the extension module system, so the string "def arange" doesn't exist in the Python source files you were searching. NumPy uses this approach for performance-critical functions to keep operations fast.

内容的提问来源于stack exchange，提问作者FreshAir