TypeError: "'TrieNode' object is not callable" - What is wrong with my code?

Question

我写这段代码是为了测试前缀树，但出于某种原因我得到了错误 "TrieNode" object is not callable。有人可以帮我解决这个错误吗？

为什么 TrieNode() class 不可调用？

# Prefix Tree or Trie Data Structure
class TrieNode(object):
    def __init__(self):
        self.children = {}
        self.endOfWord = False

class Trie(object):
    def __init__(self):
        self.root = TrieNode()

def insert(self,word):
    node = self.root()
    for w in word:
        if w not in node.children:
            node.children[w] = TrieNode()
        node = node.children[w]
    node.endOfWord = True

def search(self,word):
    node = self.root
    for w in word:
        if w not in node.children:
            return False
        node = node.children[w]

    return node.endWord

def startsWith(self,prefix):
    node = self.root
    for w in prefix:
        if w not in node.children:
            return False
        node = node.children[w]
    return True

if __name__ == "__main__":
    trie = Trie()
    trie.insert("apple")
    trie.insert("apples")
    trie.insert("bat")
    trie.insert("bate")    
    print trie.search("apple")

Answer 1

应该是

def insert(self,word):
    node = self.root

观看那里的 root() -> root。您当前正在调用实例属性，而实际上您只想获得对它的引用。