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6.4 Mapping Protocol

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

int `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)`".

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 the Python expression "`o.has_key(key)`". 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 the Python expression "`o.has_key(key)`". 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`".