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https://github.com/python/cpython
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add16f1a5e
Add the following functions: * PyObject_HasAttrWithError() * PyObject_HasAttrStringWithError() * PyMapping_HasKeyWithError() * PyMapping_HasKeyStringWithError()
152 lines
4.9 KiB
ReStructuredText
152 lines
4.9 KiB
ReStructuredText
.. highlight:: c
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.. _mapping:
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Mapping Protocol
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================
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See also :c:func:`PyObject_GetItem`, :c:func:`PyObject_SetItem` and
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:c:func:`PyObject_DelItem`.
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.. c:function:: int PyMapping_Check(PyObject *o)
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Return ``1`` if the object provides the mapping protocol or supports slicing,
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and ``0`` otherwise. Note that it returns ``1`` for Python classes with
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a :meth:`~object.__getitem__` method, since in general it is impossible to
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determine what type of keys the class supports. This function always succeeds.
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.. c:function:: Py_ssize_t PyMapping_Size(PyObject *o)
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Py_ssize_t PyMapping_Length(PyObject *o)
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.. index:: pair: built-in function; len
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Returns the number of keys in object *o* on success, and ``-1`` on failure.
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This is equivalent to the Python expression ``len(o)``.
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.. c:function:: PyObject* PyMapping_GetItemString(PyObject *o, const char *key)
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This is the same as :c:func:`PyObject_GetItem`, but *key* is
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specified as a :c:expr:`const char*` UTF-8 encoded bytes string,
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rather than a :c:expr:`PyObject*`.
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.. c:function:: int PyMapping_GetOptionalItem(PyObject *obj, PyObject *key, PyObject **result)
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Variant of :c:func:`PyObject_GetItem` which doesn't raise
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:exc:`KeyError` if the key is not found.
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If the key is found, return ``1`` and set *\*result* to a new
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:term:`strong reference` to the corresponding value.
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If the key is not found, return ``0`` and set *\*result* to ``NULL``;
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the :exc:`KeyError` is silenced.
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If an error other than :exc:`KeyError` is raised, return ``-1`` and
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set *\*result* to ``NULL``.
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.. versionadded:: 3.13
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.. c:function:: int PyMapping_GetOptionalItemString(PyObject *obj, const char *key, PyObject **result)
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This is the same as :c:func:`PyMapping_GetOptionalItem`, but *key* is
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specified as a :c:expr:`const char*` UTF-8 encoded bytes string,
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rather than a :c:expr:`PyObject*`.
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.. versionadded:: 3.13
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.. c:function:: int PyMapping_SetItemString(PyObject *o, const char *key, PyObject *v)
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This is the same as :c:func:`PyObject_SetItem`, but *key* is
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specified as a :c:expr:`const char*` UTF-8 encoded bytes string,
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rather than a :c:expr:`PyObject*`.
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.. c:function:: int PyMapping_DelItem(PyObject *o, PyObject *key)
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This is an alias of :c:func:`PyObject_DelItem`.
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.. c:function:: int PyMapping_DelItemString(PyObject *o, const char *key)
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This is the same as :c:func:`PyObject_DelItem`, but *key* is
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specified as a :c:expr:`const char*` UTF-8 encoded bytes string,
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rather than a :c:expr:`PyObject*`.
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.. c:function:: int PyMapping_HasKeyWithError(PyObject *o, PyObject *key)
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Return ``1`` if the mapping object has the key *key* and ``0`` otherwise.
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This is equivalent to the Python expression ``key in o``.
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On failure, return ``-1``.
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.. versionadded:: 3.13
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.. c:function:: int PyMapping_HasKeyStringWithError(PyObject *o, const char *key)
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This is the same as :c:func:`PyMapping_HasKeyWithError`, but *key* is
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specified as a :c:expr:`const char*` UTF-8 encoded bytes string,
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rather than a :c:expr:`PyObject*`.
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.. versionadded:: 3.13
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.. c:function:: int PyMapping_HasKey(PyObject *o, PyObject *key)
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Return ``1`` if the mapping object has the key *key* and ``0`` otherwise.
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This is equivalent to the Python expression ``key in o``.
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This function always succeeds.
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.. note::
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Exceptions which occur when this calls :meth:`~object.__getitem__`
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method are silently ignored.
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For proper error handling, use :c:func:`PyMapping_HasKeyWithError`,
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:c:func:`PyMapping_GetOptionalItem` or :c:func:`PyObject_GetItem()` instead.
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.. c:function:: int PyMapping_HasKeyString(PyObject *o, const char *key)
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This is the same as :c:func:`PyMapping_HasKey`, but *key* is
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specified as a :c:expr:`const char*` UTF-8 encoded bytes string,
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rather than a :c:expr:`PyObject*`.
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.. note::
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Exceptions that occur when this calls :meth:`~object.__getitem__`
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method or while creating the temporary :class:`str`
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object are silently ignored.
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For proper error handling, use :c:func:`PyMapping_HasKeyStringWithError`,
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:c:func:`PyMapping_GetOptionalItemString` or
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:c:func:`PyMapping_GetItemString` instead.
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.. c:function:: PyObject* PyMapping_Keys(PyObject *o)
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On success, return a list of the keys in object *o*. On failure, return
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``NULL``.
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.. versionchanged:: 3.7
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Previously, the function returned a list or a tuple.
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.. c:function:: PyObject* PyMapping_Values(PyObject *o)
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On success, return a list of the values in object *o*. On failure, return
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``NULL``.
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.. versionchanged:: 3.7
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Previously, the function returned a list or a tuple.
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.. c:function:: PyObject* PyMapping_Items(PyObject *o)
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On success, return a list of the items in object *o*, where each item is a
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tuple containing a key-value pair. On failure, return ``NULL``.
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.. versionchanged:: 3.7
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Previously, the function returned a list or a tuple.
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