How can I see Python's __builtins__ source cod

Question

Can I get python to print the source code for __builtins__ directly?

OR (more preferably):

What is the pathname of the source code for __builtins__?

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I at least know the following things:

• __builtins__ is a module, by typing type(__builtins__).

• I have tried the best-answer-suggestions to a more general case of this SO question: "Finding the source code for built-in Python functions?". But no luck:

  • print inspect.getdoc(__builtins__) just gives me a description.

  • inspect.getfile(__builtins__) just gives me an error: TypeError: <module '__builtin__' (built-in)> is a built-in module

  • https://hg.python.org/cpython/file/c6880edaf6f3/# does not seem to contain an entry for __builtins__. I've tried "site:" search and browsed several of the directories but gave up after a few.

Answer 1

I can't try it right now, but python default ide is able to open core modules easily (I tried with math and some more)

https://docs.python.org/2/library/idle.html

On menus. Open module.

Answer 2

The __builtin__ module is implemented in Python/bltinmodule.c, a rather unusual location for a rather unusual module.