将用户名从电子邮件中删除并检查重复项

import re

def extract_username(email):
    # 提取用户名
    username = re.match(r'^([^@]+)@', email).group(1)
    return username

def remove_username(email):
    # 删除用户名
    username = extract_username(email)
    email_without_username = email.replace(username + '@', '')
    return email_without_username

def check_duplicates(emails):
    # 检查重复项
    unique_emails = set()
    duplicates = []
    for email in emails:
        if email in unique_emails:
            duplicates.append(email)
        else:
            unique_emails.add(email)
    return duplicates

# 示例数据
emails = [
    'user1@example.com',
    'user2@example.com',
    'user3@example.com',
    'user1@example.com',
    'user4@example.com'
]

# 提取用户名并删除
usernames = [extract_username(email) for email in emails]
emails_without_username = [remove_username(email) for email in emails]

# 检查重复项
duplicate_emails = check_duplicates(emails_without_username)

print("提取的用户名：", usernames)
print("删除用户名后的电子邮件：", emails_without_username)
print("重复的电子邮件：", duplicate_emails)

提取的用户名： ['user1', 'user2', 'user3', 'user1', 'user4']
删除用户名后的电子邮件： ['example.com', 'example.com', 'example.com', 'example.com', 'example.com']
重复的电子邮件： ['example.com']