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.. _aiohttp-structures:
Common data structures
======================
.. module:: aiohttp
.. currentmodule:: aiohttp
Common data structures used by *aiohttp* internally.
FrozenList
----------
A list-like structure which implements
:class:`collections.abc.MutableSequence`.
The list is *mutable* unless :meth:`FrozenList.freeze` is called,
after that the list modification raises :exc:`RuntimeError`.
.. class:: FrozenList(items)
Construct a new *non-frozen* list from *items* iterable.
The list implements all :class:`collections.abc.MutableSequence`
methods plus two additional APIs.
.. attribute:: frozen
A read-only property, ``True`` is the list is *frozen*
(modifications are forbidden).
.. method:: freeze()
Freeze the list. There is no way to *thaw* it back.
ChainMapProxy
-------------
An *immutable* version of :class:`collections.ChainMap`. Internally
the proxy is a list of mappings (dictionaries), if the requested key
is not present in the first mapping the second is looked up and so on.
The class supports :class:`collections.abc.Mapping` interface.
.. class:: ChainMapProxy(maps)
Create a new chained mapping proxy from a list of mappings (*maps*).
.. versionadded:: 3.2
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