如何获取txt文件中单词的具体编号？

import re

def get_word_number(filename):
    word_dict = {}
    word_number = 1

    with open(filename, 'r') as file:
        text = file.read()
        words = re.findall(r'\b\w+\b', text)  # 使用正则表达式分割单词

        for word in words:
            word = word.lower()  # 转换为小写字母
            if word not in word_dict:
                word_dict[word] = word_number
                word_number += 1

    return word_dict

filename = 'example.txt'
word_dict = get_word_number(filename)

for word, number in word_dict.items():
    print(f"单词: {word}，编号: {number}")