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Showing content from https://docs.python.org/2.7/c-api/mapping.html below:

Mapping Protocol — Python 2.7.18 documentation

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.

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