字典树

字典树的python实现

# coding:utf-8

class Trie(object):
    """字典树的删改查"""
    def __init__(self):
        self.lookup = {}

    def insert(self, word: str) -> None:
        tree = self.lookup
        for a in word:
            if a not in tree:
                tree[a] = {}
            tree = tree[a]
        tree['#'] = '#'

    def search(self, word: str) -> bool:
        tree = self.lookup
        for a in word:
            if a not in tree:
                return False
            tree = tree[a]
        if '#' in tree:
            return True
        return False

    def startsWith(self, prefix: str) -> bool:
        tree = self.lookup
        for a in prefix:
            if a not in tree:
                return False
            tree = tree[a]
        return True
    @property
    def content(self):
        return self.lookup


if __name__ == '__main__':
    trie = Trie()
    trie.insert("你好吗")
    trie.insert("我好呀")
    trie.insert("你好吗，我是新来的")
    print(trie.content)
    print(trie.search("你好吗"))
    print(trie.startsWith("我是"))
    print(trie.startsWith("你"))

trie.PNG