查找元素重复性的python代码

import tkinter as tk
from tkinter import messagebox
import pymysql


conn = pymysql.connect(host='localhost',user='root',
                             password='pananjun',
                             db='cus',
                             charset='utf8')

cursor = conn.cursor()


class 查找元素(tk.Tk):
    def __init__(self):
        super().__init__()

        self.title('查找元素')
        self.geometry('600x400')

        frame = tk.Frame(self)
        frame.pack(padx=20, pady=20, fill=tk.BOTH, expand=True)

        self.var = tk.StringVar()
        entry = tk.Entry(frame, textvariable=self.var)
        entry.grid(row=0, column=0, padx=10, pady=10)

        lookup_btn = tk.Button(frame, text='查找', command=self.lookup)
        lookup_btn.grid(row=0, column=1, padx=10, pady=10)

        # 显示查找结果
        self.result_var = tk.StringVar()
        result_label = tk.Label(frame, textvariable=self.result_var)
        result_label.grid(row=1, column=0, columnspan=2, padx=10, pady=10)

    def lookup(self):
        element = self.var.get()

        # 查询SQL语句
        sql = f"SELECT * FROM 商品表 WHERE 商品编号 = '{element}'"
        cursor.execute(sql)
        result = cursor.fetchone()

        if result:
            self.result_var.set(f'该编号已存在禁止入库：{result[0]}')
        else:
            self.result_var.set('未找到该编号，允许入库')

# 主程序
app = 查找元素()
app.mainloop()

# 关闭数据库连接
conn.close()