Type of the functions used to implement Python callables in C

with signature :const:`METH_VARARGS | METH_KEYWORDS`.

.. c:type:: _PyCFunctionFast

Type of the functions used to implement Python callables in C

with signature :const:`METH_FASTCALL`.

.. c:type:: _PyCFunctionFastWithKeywords

Type of the functions used to implement Python callables in C

with signature :const:`METH_FASTCALL | METH_KEYWORDS`.

convention.

There are four basic calling conventions for positional arguments

and two of them can be combined with :const:`METH_KEYWORDS` to support

also keyword arguments. So there are a total of 6 calling conventions:

.. data:: METH_VARARGS | METH_KEYWORDS

The function expects three parameters: *self*, *args*, *kwargs* where

*kwargs* is a dictionary of all the keyword arguments or possibly *NULL*

if there are no keyword arguments. The parameters are typically processed

using :c:func:`PyArg_ParseTupleAndKeywords`.

.. data:: METH_FASTCALL

Fast calling convention supporting only positional arguments.

The methods have the type :c:type:`_PyCFunctionFast`.

The first parameter is *self*, the second parameter is a C array

of :c:type:`PyObject\*` values indicating the arguments and the third

parameter is the number of arguments (the length of the array).

This is not part of the :ref:`limited API <stable>`.

.. versionadded:: 3.7

.. data:: METH_FASTCALL | METH_KEYWORDS

Extension of :const:`METH_FASTCALL` supporting also keyword arguments,

with methods of type :c:type:`_PyCFunctionFastWithKeywords`.

Keyword arguments are passed the same way as in the vectorcall protocol:

there is an additional fourth :c:type:`PyObject\*` parameter

which is a tuple representing the names of the keyword arguments

or possibly *NULL* if there are no keywords. The values of the keyword

arguments are stored in the *args* array, after the positional arguments.

This is not part of the :ref:`limited API <stable>`.

.. versionadded:: 3.7