Mapping Protocol — Python 2.7.18 documentation

This document is for an old version of Python that is no longer supported. You should upgrade and read the Python documentation for the current stable release.

Mapping Protocol¶

int PyMapping_Check(PyObject *o)¶: Return 1 if the object provides mapping protocol, and 0 otherwise. This function always succeeds.

Py_ssize_t PyMapping_Size(PyObject *o)¶
Py_ssize_t PyMapping_Length(PyObject *o)¶: 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).

Changed in version 2.5: These functions returned an int type. This might require changes in your code for properly supporting 64-bit systems.

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].

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].

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.

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.

PyObject* PyMapping_Keys(PyObject *o)¶: Return value: New reference.
On success, return a list of the keys in object o. On failure, return NULL. This is equivalent to the Python expression o.keys().

PyObject* PyMapping_Values(PyObject *o)¶: Return value: New reference.
On success, return a list of the values in object o. On failure, return NULL. This is equivalent to the Python expression o.values().

PyObject* PyMapping_Items(PyObject *o)¶: Return value: New reference.
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().

PyObject* PyMapping_GetItemString(PyObject *o, char *key)¶: Return value: New reference.
Return element of o corresponding to the object key or NULL on failure. This is the equivalent of the Python expression o[key].

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.