# Copyright 2017 SrMouraSilva
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
[docs]class DictTuple(tuple):
"""
Dict tuple is a union with dicts and tuples. It's possible obtains an element
by index or by a key
The key is not been a int or long instance
Based in http://jfine-python-classes.readthedocs.io/en/latest/subclass-tuple.html
:param iterable elements: Elements for the tuple
:param lambda key_function: Function mapper: it obtains an element and
returns your key.
"""
def __new__(cls, elements, key_function):
return tuple.__new__(DictTuple, tuple(elements))
def __init__(self, elements, key_function):
self._dict = dict(
(key_function(element), element) for element in elements
)
def __getitem__(self, index):
if isinstance(index, int):
return super(DictTuple, self).__getitem__(index)
else:
return self._dict[index]
def __contains__(self, item):
return item in self._dict