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.. highlightlang:: c
.. _mapping:
Mapping Protocol
================
.. cfunction:: int PyMapping_Check(PyObject *o)
Return ``1`` if the object provides mapping protocol, and ``0`` otherwise. This
function always succeeds.
.. cfunction:: Py_ssize_t PyMapping_Size(PyObject *o)
Py_ssize_t PyMapping_Length(PyObject *o)
.. index:: builtin: len
Returns the number of keys in object *o* on success, and ``-1`` on failure. For
objects that do not provide mapping protocol, this is equivalent to the Python
expression ``len(o)``.
.. versionchanged:: 2.5
These functions returned an :ctype:`int` type. This might require
changes in your code for properly supporting 64-bit systems.
.. cfunction:: int PyMapping_DelItemString(PyObject *o, char *key)
Remove the mapping for object *key* from the object *o*. Return ``-1`` on
failure. This is equivalent to the Python statement ``del o[key]``.
.. cfunction:: int PyMapping_DelItem(PyObject *o, PyObject *key)
Remove the mapping for object *key* from the object *o*. Return ``-1`` on
failure. This is equivalent to the Python statement ``del o[key]``.
.. cfunction:: int PyMapping_HasKeyString(PyObject *o, char *key)
On success, return ``1`` if the mapping object has the key *key* and ``0``
otherwise. This is equivalent to ``o[key]``, returning ``True`` on success
and ``False`` on an exception. This function always succeeds.
.. cfunction:: int PyMapping_HasKey(PyObject *o, PyObject *key)
Return ``1`` if the mapping object has the key *key* and ``0`` otherwise.
This is equivalent to ``o[key]``, returning ``True`` on success and ``False``
on an exception. This function always succeeds.
.. cfunction:: PyObject* PyMapping_Keys(PyObject *o)
On success, return a list of the keys in object *o*. On failure, return *NULL*.
This is equivalent to the Python expression ``o.keys()``.
.. cfunction:: PyObject* PyMapping_Values(PyObject *o)
On success, return a list of the values in object *o*. On failure, return
*NULL*. This is equivalent to the Python expression ``o.values()``.
.. cfunction:: PyObject* PyMapping_Items(PyObject *o)
On success, return a list of the items in object *o*, where each item is a tuple
containing a key-value pair. On failure, return *NULL*. This is equivalent to
the Python expression ``o.items()``.
.. cfunction:: PyObject* PyMapping_GetItemString(PyObject *o, char *key)
Return element of *o* corresponding to the object *key* or *NULL* on failure.
This is the equivalent of the Python expression ``o[key]``.
.. cfunction:: int PyMapping_SetItemString(PyObject *o, char *key, PyObject *v)
Map the object *key* to the value *v* in object *o*. Returns ``-1`` on failure.
This is the equivalent of the Python statement ``o[key] = v``.
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