提取唯一的域名比较两个文本文件？Python

import re

def extract_domain(text):
    pattern = r'(https?://)?([^\s/$.?#].[^\s]*)'
    domains = re.findall(pattern, text)
    return [domain[1] for domain in domains]

file1 = open('file1.txt', 'r')
file2 = open('file2.txt', 'r')

text1 = file1.read()
text2 = file2.read()

file1.close()
file2.close()

domains1 = extract_domain(text1)
domains2 = extract_domain(text2)

unique_domains = set(domains1) - set(domains2)

print("唯一的域名：")
for domain in unique_domains:
    print(domain)