File datastructures.py has 273 lines of code (exceeds 250 allowed). Consider refactoring.

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import copy
from collections.abc import Mapping


class OrderedSet:

MultiValueDict has 21 functions (exceeds 20 allowed). Consider refactoring.

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class MultiValueDict(dict):
    """
    A subclass of dictionary customized to handle multiple values for the
    same key.

Function update has a Cognitive Complexity of 15 (exceeds 5 allowed). Consider refactoring.

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    def update(self, *args, **kwargs):
        """Extend rather than replace existing key lists."""
        if len(args) > 1:
            raise TypeError("update expected at most 1 argument, got %d" % len(args))
        if args:

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Function _getlist has a Cognitive Complexity of 7 (exceeds 5 allowed). Consider refactoring.

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    def _getlist(self, key, default=None, force_list=False):
        """
        Return a list of values for the key.

        Used internally to manipulate values list. If force_list is True,

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Function _unpack_items has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.

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    def _unpack_items(data):
        # Explicitly test for dict first as the common case for performance,
        # avoiding abc's __instancecheck__ and _abc_instancecheck for the
        # general Mapping case.
        if isinstance(data, (dict, Mapping)):

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