How does Python call the system/primitive calls ?

[James Yu]

Dear Sirs,
 
I am trying to learn the way Python invokes system or primitive calls.
I tried to locate the function in Python's source that handles such 
requests, but I found it's like picking a needle in ocean.
Maybe you can let me know where to look for the documents and background 
readings ?

-- 
James Yu
cyu021 at gmail.com
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