Current File : //lib/python3/dist-packages/zope/interface/common/mapping.py
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# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
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# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
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"""
Mapping Interfaces.
Importing this module does *not* mark any standard classes as
implementing any of these interfaces.
While this module is not deprecated, new code should generally use
:mod:`zope.interface.common.collections`, specifically
:class:`~zope.interface.common.collections.IMapping` and
:class:`~zope.interface.common.collections.IMutableMapping`. This
module is occasionally useful for its extremely fine grained breakdown
of interfaces.
The standard library :class:`dict` and :class:`collections.UserDict`
implement ``IMutableMapping``, but *do not* implement any of the
interfaces in this module.
"""
from zope.interface import Interface
from zope.interface.common import collections
class IItemMapping(Interface):
"""Simplest readable mapping object
"""
def __getitem__(key):
"""Get a value for a key
A `KeyError` is raised if there is no value for the key.
"""
class IReadMapping(collections.IContainer, IItemMapping):
"""
Basic mapping interface.
.. versionchanged:: 5.0.0
Extend ``IContainer``
"""
def get(key, default=None):
"""Get a value for a key
The default is returned if there is no value for the key.
"""
def __contains__(key):
"""Tell if a key exists in the mapping."""
# Optional in IContainer, required by this interface.
class IWriteMapping(Interface):
"""Mapping methods for changing data"""
def __delitem__(key):
"""Delete a value from the mapping using the key."""
def __setitem__(key, value):
"""Set a new item in the mapping."""
class IEnumerableMapping(collections.ISized, IReadMapping):
"""
Mapping objects whose items can be enumerated.
.. versionchanged:: 5.0.0
Extend ``ISized``
"""
def keys():
"""Return the keys of the mapping object.
"""
def __iter__():
"""Return an iterator for the keys of the mapping object.
"""
def values():
"""Return the values of the mapping object.
"""
def items():
"""Return the items of the mapping object.
"""
class IMapping(IWriteMapping, IEnumerableMapping):
''' Simple mapping interface '''
class IIterableMapping(IEnumerableMapping):
"""A mapping that has distinct methods for iterating
without copying.
"""
class IClonableMapping(Interface):
"""Something that can produce a copy of itself.
This is available in `dict`.
"""
def copy():
"return copy of dict"
class IExtendedReadMapping(IIterableMapping):
"""
Something with a particular method equivalent to ``__contains__``.
On Python 2, `dict` provided the ``has_key`` method, but it was removed
in Python 3.
"""
class IExtendedWriteMapping(IWriteMapping):
"""Additional mutation methods.
These are all provided by `dict`.
"""
def clear():
"delete all items"
def update(d):
" Update D from E: for k in E.keys(): D[k] = E[k]"
def setdefault(key, default=None):
"D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D"
def pop(k, default=None):
"""
pop(k[,default]) -> value
Remove specified key and return the corresponding value.
If key is not found, *default* is returned if given, otherwise
`KeyError` is raised. Note that *default* must not be passed by
name.
"""
def popitem():
"""remove and return some (key, value) pair as a
2-tuple; but raise KeyError if mapping is empty"""
class IFullMapping(
collections.IMutableMapping,
IExtendedReadMapping, IExtendedWriteMapping, IClonableMapping, IMapping,):
"""
Full mapping interface.
Most uses of this interface should instead use
:class:`~zope.interface.commons.collections.IMutableMapping` (one of the
bases of this interface). The required methods are the same.
.. versionchanged:: 5.0.0
Extend ``IMutableMapping``
"""
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