trie.py

from collections import defaultdict

class Trie:

    def __init__(self):
        """
        Initialize your data structure here.
        """
        self.root = defaultdict(str)
        
    def insert(self, word: str) -> None:
        """
        Inserts a word into the trie.
        """
        curr = self.root
        for letter in word:
            if letter not in curr:
                curr[letter] = defaultdict(str)
            curr = curr[letter]
        curr['*'] = True

    def search(self, word: str) -> bool:
        """
        Returns if the word is in the trie.
        """
        curr = self.root
        for letter in word:
            if letter in curr:
                curr = curr[letter]
            else:
                return False
        if '*' in curr:
            return True
        else:
            return False
        

    def startsWith(self, prefix: str) -> bool:
        """
        Returns if there is any word in the trie that starts with the given prefix.
        """
        curr = self.root
        for letter in prefix:
            if letter in curr:
                curr = curr[letter]
            else:
                return False
        return True


# Your Trie object will be instantiated and called as such:
# obj = Trie()
# obj.insert(word)
# param_2 = obj.search(word)
# param_3 = obj.startsWith(prefix)