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Edit File: _base.py
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])