CPython

pythonsourcecodeinterpretergithub

Reading python source code

• Start with Python C API
  • Py_INCREF

Tasks

• [ ] Compiler python from source

Python C API

Use inside of python to build new python

Hello World Extension

Why write in C?

• speed
• Legacy
• Integration
• Community

• Used to build Python
• ~600 Entrypoints
• only applies to CPython
• Any built-in function or type
• Deal with with C messyness
  • write something and then say we wrote it.
• Building C Extensions - distutils know how to do that
  • ext_modules
• PyObject* pointer
• Type-specific functions
  • bunch of dedicated C functions, just for dicts
  • lists etc.
• Py_BuildValues like sprintf
• PyArg_ParseTuples - reading arguments

def hello_world():
    return "Hello World"

#include "python.h"

static PyObject *

Memory Management

most messy part

• Reference counting protocol
  • counting borrowed references
  • Pt_DECREF

Making a Type

1. Create structure
2. Write init and dealloc
3. decalre members
4. Write functions
5. Declare functions
6. Make the type ready

References

• POSIX

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