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Python/C API Reference Manual

Previous: 6.3 Sequence Protocol Up: 6. Abstract Objects Layer Next: 6.5 Iterator Protocol

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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".

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Python/C API Reference Manual

Previous: 6.3 Sequence Protocol Up: 6. Abstract Objects Layer Next: 6.5 Iterator Protocol

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Release 2.2.3, documentation updated on 30 May 2003.