在sqlite3和python Tkinter中插入电子邮件字符串时出错

import sqlite3
from tkinter import Tk, Entry, Button

# 创建SQLite3数据库连接
conn = sqlite3.connect('database.db')
cursor = conn.cursor()

# 创建表
cursor.execute('''CREATE TABLE IF NOT EXISTS emails
                  (id INTEGER PRIMARY KEY AUTOINCREMENT,
                   email TEXT)''')

# Tkinter窗口
window = Tk()

# 输入框和按钮
email_entry = Entry(window)
email_entry.pack()

def insert_email():
    email = email_entry.get()
    
    # 插入电子邮件字符串
    cursor.execute("INSERT INTO emails (email) VALUES (?)", (email,))
    conn.commit()

insert_button = Button(window, text="插入", command=insert_email)
insert_button.pack()

window.mainloop()

# 关闭数据库连接
conn.close()