104 lines
3.4 KiB
ReStructuredText
104 lines
3.4 KiB
ReStructuredText
.. highlight:: c
|
|
|
|
.. _mapping:
|
|
|
|
Mapping Protocol
|
|
================
|
|
|
|
See also :c:func:`PyObject_GetItem`, :c:func:`PyObject_SetItem` and
|
|
:c:func:`PyObject_DelItem`.
|
|
|
|
|
|
.. c:function:: int PyMapping_Check(PyObject *o)
|
|
|
|
Return ``1`` if the object provides mapping protocol or supports slicing,
|
|
and ``0`` otherwise. Note that it returns ``1`` for Python classes with
|
|
a :meth:`__getitem__` method since in general case it is impossible to
|
|
determine what the type of keys it supports. This function always
|
|
succeeds.
|
|
|
|
|
|
.. c:function:: 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.
|
|
This is equivalent to the Python expression ``len(o)``.
|
|
|
|
|
|
.. c:function:: PyObject* PyMapping_GetItemString(PyObject *o, const char *key)
|
|
|
|
Return element of *o* corresponding to the string *key* or *NULL* on failure.
|
|
This is the equivalent of the Python expression ``o[key]``.
|
|
See also :c:func:`PyObject_GetItem`.
|
|
|
|
|
|
.. c:function:: int PyMapping_SetItemString(PyObject *o, const char *key, PyObject *v)
|
|
|
|
Map the string *key* to the value *v* in object *o*. Returns ``-1`` on
|
|
failure. This is the equivalent of the Python statement ``o[key] = v``.
|
|
See also :c:func:`PyObject_SetItem`.
|
|
|
|
|
|
.. c:function:: int PyMapping_DelItem(PyObject *o, PyObject *key)
|
|
|
|
Remove the mapping for the object *key* from the object *o*. Return ``-1``
|
|
on failure. This is equivalent to the Python statement ``del o[key]``.
|
|
This is an alias of :c:func:`PyObject_DelItem`.
|
|
|
|
|
|
.. c:function:: int PyMapping_DelItemString(PyObject *o, const char *key)
|
|
|
|
Remove the mapping for the string *key* from the object *o*. Return ``-1``
|
|
on failure. This is equivalent to the Python statement ``del o[key]``.
|
|
|
|
|
|
.. c:function:: int PyMapping_HasKey(PyObject *o, PyObject *key)
|
|
|
|
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.
|
|
|
|
Note that exceptions which occur while calling the :meth:`__getitem__`
|
|
method will get suppressed.
|
|
To get error reporting use :c:func:`PyObject_GetItem()` instead.
|
|
|
|
|
|
.. c:function:: int PyMapping_HasKeyString(PyObject *o, const char *key)
|
|
|
|
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.
|
|
|
|
Note that exceptions which occur while calling the :meth:`__getitem__`
|
|
method and creating a temporary string object will get suppressed.
|
|
To get error reporting use :c:func:`PyMapping_GetItemString()` instead.
|
|
|
|
|
|
.. c:function:: PyObject* PyMapping_Keys(PyObject *o)
|
|
|
|
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.
|
|
|
|
|
|
.. c:function:: PyObject* PyMapping_Values(PyObject *o)
|
|
|
|
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.
|
|
|
|
|
|
.. c:function:: 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*.
|
|
|
|
.. versionchanged:: 3.7
|
|
Previously, the function returned a list or a tuple.
|