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📍 /opt/alt/python37/lib/python3.7/site-packages/pip/_vendor/html5lib/_trie

from __future__ import absolute_import, division, unicode_literals

try:
    from collections.abc import Mapping
except ImportError:  # Python 2.7
    from collections import Mapping

class Trie(Mapping):
    """Abstract base class for tries"""

def keys(self, prefix=None):
        # pylint:disable=arguments-differ
        keys = super(Trie, self).keys()

if prefix is None:
            return set(keys)

return {x for x in keys if x.startswith(prefix)}

def has_keys_with_prefix(self, prefix):
        for key in self.keys():
            if key.startswith(prefix):
                return True

return False

def longest_prefix(self, prefix):
        if prefix in self:
            return prefix

for i in range(1, len(prefix) + 1):
            if prefix[:-i] in self:
                return prefix[:-i]

raise KeyError(prefix)

def longest_prefix_item(self, prefix):
        lprefix = self.longest_prefix(prefix)
        return (lprefix, self[lprefix])

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