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Title: Introduction — Python 3.15.0a5 documentation

Open Graph Title: Introduction

Description: The Application Programmer’s Interface to Python gives C and C++ programmers access to the Python interpreter at a variety of levels. The API is equally usable from C++, but for brevity it is gener...

Open Graph Description: The Application Programmer’s Interface to Python gives C and C++ programmers access to the Python interpreter at a variety of levels. The API is equally usable from C++, but for brevity it is gener...

Opengraph URL: https://docs.python.org/3/c-api/intro.html

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Domain: docs.python.org

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og:site_name	Python documentation
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og:image	https://docs.python.org/3.15/_images/social_previews/summary_c-api_intro_c17506fc.png
og:image:alt	The Application Programmer’s Interface to Python gives C and C++ programmers access to the Python interpreter at a variety of levels. The API is equally usable from C++, but for brevity it is gener...
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Links:

	https://www.python.org/
Table of Contents	https://docs.python.org/dev/contents.html
Introduction	https://docs.python.org/dev/c-api/intro.html
Language version compatibility	https://docs.python.org/dev/c-api/intro.html#language-version-compatibility
Coding standards	https://docs.python.org/dev/c-api/intro.html#coding-standards
Include Files	https://docs.python.org/dev/c-api/intro.html#include-files
System includes	https://docs.python.org/dev/c-api/intro.html#system-includes
Useful macros	https://docs.python.org/dev/c-api/intro.html#useful-macros
Objects, Types and Reference Counts	https://docs.python.org/dev/c-api/intro.html#objects-types-and-reference-counts
Reference Counts	https://docs.python.org/dev/c-api/intro.html#reference-counts
Reference Count Details	https://docs.python.org/dev/c-api/intro.html#reference-count-details
Types	https://docs.python.org/dev/c-api/intro.html#types
Exceptions	https://docs.python.org/dev/c-api/intro.html#exceptions
Embedding Python	https://docs.python.org/dev/c-api/intro.html#embedding-python
Debugging Builds	https://docs.python.org/dev/c-api/intro.html#debugging-builds
Recommended third party tools	https://docs.python.org/dev/c-api/intro.html#recommended-third-party-tools
Python/C API Reference Manual	https://docs.python.org/dev/c-api/index.html
C API and ABI Stability	https://docs.python.org/dev/c-api/stable.html
Report a bug	https://docs.python.org/dev/bugs.html
Show source	https://github.com/python/cpython/blob/main/Doc/c-api/intro.rst?plain=1
index	https://docs.python.org/dev/genindex.html
modules	https://docs.python.org/dev/py-modindex.html
next	https://docs.python.org/dev/c-api/stable.html
previous	https://docs.python.org/dev/c-api/index.html
Python	https://www.python.org/
3.15.0a5 Documentation	https://docs.python.org/dev/index.html
Python/C API Reference Manual	https://docs.python.org/dev/c-api/index.html
Introduction	https://docs.python.org/dev/c-api/intro.html
¶	https://docs.python.org/dev/c-api/intro.html#introduction
¶	https://docs.python.org/dev/c-api/intro.html#language-version-compatibility
¶	https://docs.python.org/dev/c-api/intro.html#coding-standards
PEP 7	https://peps.python.org/pep-0007/
¶	https://docs.python.org/dev/c-api/intro.html#include-files
Parsing arguments and building values	https://docs.python.org/dev/c-api/arg.html#arg-parsing
prefix	https://docs.python.org/dev/using/configure.html#cmdoption-prefix
exec_prefix	https://docs.python.org/dev/using/configure.html#cmdoption-exec-prefix
prefix	https://docs.python.org/dev/using/configure.html#cmdoption-prefix
exec_prefix	https://docs.python.org/dev/using/configure.html#cmdoption-exec-prefix
¶	https://docs.python.org/dev/c-api/intro.html#system-includes
Limited API	https://docs.python.org/dev/c-api/stable.html#limited-c-api
Limited API	https://docs.python.org/dev/c-api/stable.html#limited-c-api
¶	https://docs.python.org/dev/c-api/intro.html#useful-macros
Py_RETURN_NONE	https://docs.python.org/dev/c-api/none.html#c.Py_RETURN_NONE
PyMODINIT_FUNC	https://docs.python.org/dev/c-api/extension-modules.html#c.PyMODINIT_FUNC
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_ABS
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_ALWAYS_INLINE
built in debug mode	https://docs.python.org/dev/using/configure.html#debug-build
Py_DEBUG	https://docs.python.org/dev/c-api/intro.html#c.Py_DEBUG
Py_ALWAYS_INLINE	https://docs.python.org/dev/c-api/intro.html#c.Py_ALWAYS_INLINE
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_CHARMASK
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_DEPRECATED
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_GETENV
-E	https://docs.python.org/dev/using/cmdline.html#cmdoption-E
PyConfig.use_environment	https://docs.python.org/dev/c-api/init_config.html#c.PyConfig.use_environment
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_LOCAL
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_LOCAL_INLINE
Py_LOCAL	https://docs.python.org/dev/c-api/intro.html#c.Py_LOCAL
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_LOCAL_SYMBOL
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_MAX
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_MEMBER_SIZE
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_MEMCPY
soft deprecated	https://docs.python.org/dev/glossary.html#term-soft-deprecated
soft deprecated	https://docs.python.org/dev/glossary.html#term-soft-deprecated
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_MIN
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_NO_INLINE
bpo-33720	https://bugs.python.org/issue?@action=redirect&bpo=33720
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_STRINGIFY
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_UNREACHABLE
Py_FatalError()	https://docs.python.org/dev/c-api/sys.html#c.Py_FatalError
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_UNUSED
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_BUILD_ASSERT
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_BUILD_ASSERT_EXPR
¶	https://docs.python.org/dev/c-api/intro.html#c.PyDoc_STRVAR
PyDoc_STRVAR	https://docs.python.org/dev/c-api/intro.html#c.PyDoc_STRVAR
PEP 7	https://peps.python.org/pep-0007/
¶	https://docs.python.org/dev/c-api/intro.html#c.PyDoc_STR
PyDoc_STR	https://docs.python.org/dev/c-api/intro.html#c.PyDoc_STR
PEP 7	https://peps.python.org/pep-0007/
¶	https://docs.python.org/dev/c-api/intro.html#c.PyDoc_VAR
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_ARRAY_LENGTH
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_EXPORTED_SYMBOL
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_IMPORTED_SYMBOL
¶	https://docs.python.org/dev/c-api/intro.html#c.PyAPI_FUNC
¶	https://docs.python.org/dev/c-api/intro.html#c.PyAPI_DATA
¶	https://docs.python.org/dev/c-api/intro.html#objects-types-and-reference-counts
PyObject	https://docs.python.org/dev/c-api/structures.html#c.PyObject
PyObject	https://docs.python.org/dev/c-api/structures.html#c.PyObject
PyObject	https://docs.python.org/dev/c-api/structures.html#c.PyObject
PyTypeObject	https://docs.python.org/dev/c-api/type.html#c.PyTypeObject
The standard type hierarchy	https://docs.python.org/dev/reference/datamodel.html#types
¶	https://docs.python.org/dev/c-api/intro.html#reference-counts
strong reference	https://docs.python.org/dev/glossary.html#term-strong-reference
strong reference	https://docs.python.org/dev/glossary.html#term-strong-reference
Py_INCREF()	https://docs.python.org/dev/c-api/refcounting.html#c.Py_INCREF
Py_DECREF()	https://docs.python.org/dev/c-api/refcounting.html#c.Py_DECREF
Py_DECREF()	https://docs.python.org/dev/c-api/refcounting.html#c.Py_DECREF
strong reference	https://docs.python.org/dev/glossary.html#term-strong-reference
strong reference	https://docs.python.org/dev/glossary.html#term-strong-reference
Py_DECREF()	https://docs.python.org/dev/c-api/refcounting.html#c.Py_DECREF
strong reference	https://docs.python.org/dev/glossary.html#term-strong-reference
Py_DECREF()	https://docs.python.org/dev/c-api/refcounting.html#c.Py_DECREF
¶	https://docs.python.org/dev/c-api/intro.html#reference-count-details
Py_DECREF()	https://docs.python.org/dev/c-api/refcounting.html#c.Py_DECREF
Py_XDECREF()	https://docs.python.org/dev/c-api/refcounting.html#c.Py_XDECREF
borrowed reference	https://docs.python.org/dev/glossary.html#term-borrowed-reference
PyList_SetItem()	https://docs.python.org/dev/c-api/list.html#c.PyList_SetItem
PyTuple_SetItem()	https://docs.python.org/dev/c-api/tuple.html#c.PyTuple_SetItem
PyLong_FromLong()	https://docs.python.org/dev/c-api/long.html#c.PyLong_FromLong
PyTuple_SetItem()	https://docs.python.org/dev/c-api/tuple.html#c.PyTuple_SetItem
Py_INCREF()	https://docs.python.org/dev/c-api/refcounting.html#c.Py_INCREF
PyTuple_SetItem()	https://docs.python.org/dev/c-api/tuple.html#c.PyTuple_SetItem
PySequence_SetItem()	https://docs.python.org/dev/c-api/sequence.html#c.PySequence_SetItem
PyObject_SetItem()	https://docs.python.org/dev/c-api/object.html#c.PyObject_SetItem
PyTuple_SetItem()	https://docs.python.org/dev/c-api/tuple.html#c.PyTuple_SetItem
PyList_New()	https://docs.python.org/dev/c-api/list.html#c.PyList_New
PyList_SetItem()	https://docs.python.org/dev/c-api/list.html#c.PyList_SetItem
Py_BuildValue()	https://docs.python.org/dev/c-api/arg.html#c.Py_BuildValue
PyObject_SetItem()	https://docs.python.org/dev/c-api/object.html#c.PyObject_SetItem
PyObject_GetItem()	https://docs.python.org/dev/c-api/object.html#c.PyObject_GetItem
PySequence_GetItem()	https://docs.python.org/dev/c-api/sequence.html#c.PySequence_GetItem
PyList_GetItem()	https://docs.python.org/dev/c-api/list.html#c.PyList_GetItem
PySequence_GetItem()	https://docs.python.org/dev/c-api/sequence.html#c.PySequence_GetItem
PyList_GetItem()	https://docs.python.org/dev/c-api/list.html#c.PyList_GetItem
PySequence_GetItem()	https://docs.python.org/dev/c-api/sequence.html#c.PySequence_GetItem
¶	https://docs.python.org/dev/c-api/intro.html#types
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_ssize_t
Stable ABI	https://docs.python.org/dev/c-api/stable.html#stable
PEP 353	https://peps.python.org/pep-0353/
Py_ssize_t	https://docs.python.org/dev/c-api/intro.html#c.Py_ssize_t
¶	https://docs.python.org/dev/c-api/intro.html#exceptions
PyErr_Occurred()	https://docs.python.org/dev/c-api/exceptions.html#c.PyErr_Occurred
PyErr_Occurred()	https://docs.python.org/dev/c-api/exceptions.html#c.PyErr_Occurred
PyErr_SetString()	https://docs.python.org/dev/c-api/exceptions.html#c.PyErr_SetString
PyErr_Clear()	https://docs.python.org/dev/c-api/exceptions.html#c.PyErr_Clear
try	https://docs.python.org/dev/reference/compound_stmts.html#try
except	https://docs.python.org/dev/reference/compound_stmts.html#except
sys.exc_info()	https://docs.python.org/dev/library/sys.html#sys.exc_info
PyErr_ExceptionMatches()	https://docs.python.org/dev/c-api/exceptions.html#c.PyErr_ExceptionMatches
PyErr_Clear()	https://docs.python.org/dev/c-api/exceptions.html#c.PyErr_Clear
Py_XDECREF()	https://docs.python.org/dev/c-api/refcounting.html#c.Py_XDECREF
Py_DECREF()	https://docs.python.org/dev/c-api/refcounting.html#c.Py_DECREF
¶	https://docs.python.org/dev/c-api/intro.html#embedding-python
Py_Initialize()	https://docs.python.org/dev/c-api/init.html#c.Py_Initialize
builtins	https://docs.python.org/dev/library/builtins.html#module-builtins
__main__	https://docs.python.org/dev/library/__main__.html#module-__main__
sys	https://docs.python.org/dev/library/sys.html#module-sys
Py_Initialize()	https://docs.python.org/dev/c-api/init.html#c.Py_Initialize
PyConfig.argv	https://docs.python.org/dev/c-api/init_config.html#c.PyConfig.argv
PyConfig.parse_argv	https://docs.python.org/dev/c-api/init_config.html#c.PyConfig.parse_argv
Python Initialization Configuration	https://docs.python.org/dev/c-api/init_config.html#init-config
Py_Initialize()	https://docs.python.org/dev/c-api/init.html#c.Py_Initialize
PYTHONHOME	https://docs.python.org/dev/using/cmdline.html#envvar-PYTHONHOME
PYTHONPATH	https://docs.python.org/dev/using/cmdline.html#envvar-PYTHONPATH
PyConfig.program_name	https://docs.python.org/dev/c-api/init_config.html#c.PyConfig.program_name
Py_InitializeFromConfig()	https://docs.python.org/dev/c-api/init.html#c.Py_InitializeFromConfig
PYTHONHOME	https://docs.python.org/dev/using/cmdline.html#envvar-PYTHONHOME
PYTHONPATH	https://docs.python.org/dev/using/cmdline.html#envvar-PYTHONPATH
Py_Initialize()	https://docs.python.org/dev/c-api/init.html#c.Py_Initialize
Py_FinalizeEx()	https://docs.python.org/dev/c-api/init.html#c.Py_FinalizeEx
Py_IsInitialized()	https://docs.python.org/dev/c-api/init.html#c.Py_IsInitialized
Py_FinalizeEx()	https://docs.python.org/dev/c-api/init.html#c.Py_FinalizeEx
¶	https://docs.python.org/dev/c-api/intro.html#debugging-builds
¶	https://docs.python.org/dev/c-api/intro.html#c.Py_DEBUG
a debug build of Python	https://docs.python.org/dev/using/configure.html#debug-build
--with-pydebug	https://docs.python.org/dev/using/configure.html#cmdoption-with-pydebug
-d	https://docs.python.org/dev/using/cmdline.html#cmdoption-d
Python Debug Build	https://docs.python.org/dev/using/configure.html#debug-build
configure --with-trace-refs option	https://docs.python.org/dev/using/configure.html#cmdoption-with-trace-refs
PyObject	https://docs.python.org/dev/c-api/structures.html#c.PyObject
¶	https://docs.python.org/dev/c-api/intro.html#recommended-third-party-tools
Cython	https://cython.org/
cffi	https://cffi.readthedocs.io
HPy	https://hpyproject.org/
nanobind	https://github.com/wjakob/nanobind
Numba	https://numba.pydata.org/
pybind11	https://pybind11.readthedocs.io/
PyO3	https://pyo3.rs/
SWIG	https://www.swig.org
Python Packaging User Guide: Binary Extensions	https://packaging.python.org/guides/packaging-binary-extensions/
Table of Contents	https://docs.python.org/dev/contents.html
Introduction	https://docs.python.org/dev/c-api/intro.html
Language version compatibility	https://docs.python.org/dev/c-api/intro.html#language-version-compatibility
Coding standards	https://docs.python.org/dev/c-api/intro.html#coding-standards
Include Files	https://docs.python.org/dev/c-api/intro.html#include-files
System includes	https://docs.python.org/dev/c-api/intro.html#system-includes
Useful macros	https://docs.python.org/dev/c-api/intro.html#useful-macros
Objects, Types and Reference Counts	https://docs.python.org/dev/c-api/intro.html#objects-types-and-reference-counts
Reference Counts	https://docs.python.org/dev/c-api/intro.html#reference-counts
Reference Count Details	https://docs.python.org/dev/c-api/intro.html#reference-count-details
Types	https://docs.python.org/dev/c-api/intro.html#types
Exceptions	https://docs.python.org/dev/c-api/intro.html#exceptions
Embedding Python	https://docs.python.org/dev/c-api/intro.html#embedding-python
Debugging Builds	https://docs.python.org/dev/c-api/intro.html#debugging-builds
Recommended third party tools	https://docs.python.org/dev/c-api/intro.html#recommended-third-party-tools
Python/C API Reference Manual	https://docs.python.org/dev/c-api/index.html
C API and ABI Stability	https://docs.python.org/dev/c-api/stable.html
Report a bug	https://docs.python.org/dev/bugs.html
Show source	https://github.com/python/cpython/blob/main/Doc/c-api/intro.rst?plain=1
index	https://docs.python.org/dev/genindex.html
modules	https://docs.python.org/dev/py-modindex.html
next	https://docs.python.org/dev/c-api/stable.html
previous	https://docs.python.org/dev/c-api/index.html
Python	https://www.python.org/
3.15.0a5 Documentation	https://docs.python.org/dev/index.html
Python/C API Reference Manual	https://docs.python.org/dev/c-api/index.html
Introduction	https://docs.python.org/dev/c-api/intro.html
Copyright	https://docs.python.org/dev/copyright.html
History and License	https://docs.python.org/license.html
Please donate.	https://www.python.org/psf/donations/
Found a bug	https://docs.python.org/bugs.html
Sphinx	https://www.sphinx-doc.org/

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