^^&&^^

Edit File: frozenlist.py

from collections.abc import MutableSequence
from functools import total_ordering

from .helpers import NO_EXTENSIONS

if not NO_EXTENSIONS:
    try:
        from aiohttp._frozenlist import FrozenList
    except ImportError:  # pragma: no cover
        FrozenList = None

@total_ordering
class PyFrozenList(MutableSequence):

__slots__ = ('_frozen', '_items')

def __init__(self, items=None):
        self._frozen = False
        if items is not None:
            items = list(items)
        else:
            items = []
        self._items = items

@property
    def frozen(self):
        return self._frozen

def freeze(self):
        self._frozen = True

def __getitem__(self, index):
        return self._items[index]

def __setitem__(self, index, value):
        if self._frozen:
            raise RuntimeError("Cannot modify frozen list.")
        self._items[index] = value

def __delitem__(self, index):
        if self._frozen:
            raise RuntimeError("Cannot modify frozen list.")
        del self._items[index]

def __len__(self):
        return self._items.__len__()

def __iter__(self):
        return self._items.__iter__()

def __reversed__(self):
        return self._items.__reversed__()

def __eq__(self, other):
        return list(self) == other

def __le__(self, other):
        return list(self) <= other

def insert(self, pos, item):
        if self._frozen:
            raise RuntimeError("Cannot modify frozen list.")
        self._items.insert(pos, item)

def __repr__(self):
        return '<FrozenList(frozen={}, {!r})>'.format(self._frozen,
                                                      self._items)

if NO_EXTENSIONS or FrozenList is None:
    FrozenList = PyFrozenList