finding _collections in python source

Question

I wanted to have a look at the python deque class. When I checked the source code , I found the following at line 10

 from _collections import deque, defaultdict

where exactly can I find this _collections module? I searched on my copy of the python source, but couldn't spot it.

Where is this class located?

Answer 1

_collections is builtin extension module.

You can find source for _collection module here.

Setup.dist contains mapping between builtin extension module name to source file.