cpython/Doc/c-api/mapping.rst

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.. highlightlang:: c
.. _mapping:
Mapping Protocol
================
.. c:function:: int PyMapping_Check(PyObject *o)
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Return ``1`` if the object provides mapping protocol, and ``0`` otherwise. This
function always succeeds.
.. c:function:: Py_ssize_t PyMapping_Size(PyObject *o)
Merged revisions 71898-71900,71910,71914-71919 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r71898 | jeroen.ruigrok | 2009-04-25 16:24:30 +0200 (za, 25 apr 2009) | 2 lines Reformat prior to editing. ........ r71899 | jeroen.ruigrok | 2009-04-25 16:27:00 +0200 (za, 25 apr 2009) | 3 lines The type for ppos has been Py_ssize_t since 2.5, reflect this in the documentation. ........ r71900 | jeroen.ruigrok | 2009-04-25 16:28:02 +0200 (za, 25 apr 2009) | 2 lines Reformat paragraph. ........ r71910 | jeroen.ruigrok | 2009-04-25 19:59:03 +0200 (za, 25 apr 2009) | 4 lines Issue #4129: Belatedly document which C API functions had their argument(s) or return type changed from int or int * to Py_ssize_t or Py_ssize_t * as this might cause problems on 64-bit platforms. ........ r71914 | jeroen.ruigrok | 2009-04-25 20:31:20 +0200 (za, 25 apr 2009) | 2 lines Reformat prior to editing. ........ r71915 | jeroen.ruigrok | 2009-04-25 20:46:03 +0200 (za, 25 apr 2009) | 2 lines Issue #4129: Document more int -> Py_ssize_t changes. ........ r71916 | jeroen.ruigrok | 2009-04-25 20:53:48 +0200 (za, 25 apr 2009) | 2 lines Reformat prior to editing. ........ r71917 | jeroen.ruigrok | 2009-04-25 20:57:32 +0200 (za, 25 apr 2009) | 2 lines Reference to an int type, whereas it's a Py_ssize_t as the synopsis states. ........ r71918 | jeroen.ruigrok | 2009-04-25 21:04:15 +0200 (za, 25 apr 2009) | 2 lines Since I edited this file, reformat for future edits. ........ r71919 | jeroen.ruigrok | 2009-04-25 21:10:52 +0200 (za, 25 apr 2009) | 2 lines Reformat prior to editing. ........
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Py_ssize_t PyMapping_Length(PyObject *o)
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.. 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)``.
.. c:function:: int PyMapping_DelItemString(PyObject *o, const char *key)
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Remove the mapping for object *key* from the object *o*. Return ``-1`` on
failure. This is equivalent to the Python statement ``del o[key]``.
.. c:function:: int PyMapping_DelItem(PyObject *o, PyObject *key)
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Remove the mapping for object *key* from the object *o*. Return ``-1`` on
failure. This is equivalent to the Python statement ``del o[key]``.
.. c:function:: int PyMapping_HasKeyString(PyObject *o, const char *key)
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On success, return ``1`` if the mapping object has the key *key* and ``0``
otherwise. This is equivalent to the Python expression ``key in o``.
This function always succeeds.
.. c:function:: int PyMapping_HasKey(PyObject *o, PyObject *key)
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Return ``1`` if the mapping object has the key *key* and ``0`` otherwise. This
is equivalent to the Python expression ``key in o``. This function always
succeeds.
.. c:function:: PyObject* PyMapping_Keys(PyObject *o)
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On success, return a list of the keys in object *o*. On failure, return
*NULL*.
.. versionchanged:: 3.7
Previously, the function returned a list or a tuple.
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.. c:function:: PyObject* PyMapping_Values(PyObject *o)
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On success, return a list of the values in object *o*. On failure, return
*NULL*.
.. versionchanged:: 3.7
Previously, the function returned a list or a tuple.
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.. c:function:: PyObject* PyMapping_Items(PyObject *o)
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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*.
.. versionchanged:: 3.7
Previously, the function returned a list or a tuple.
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.. c:function:: PyObject* PyMapping_GetItemString(PyObject *o, const char *key)
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Return element of *o* corresponding to the object *key* or *NULL* on failure.
This is the equivalent of the Python expression ``o[key]``.
.. c:function:: int PyMapping_SetItemString(PyObject *o, const char *key, PyObject *v)
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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``.