Share an example of writing login and registration using python's Tkinter

import tkinter as tk
from tkinter import messagebox
 
#设置窗口居中
def window_info():
 ws = window.winfo_screenwidth()
 hs = window.winfo_screenheight()
 x = (ws / 2) - 200
 y = (hs / 2) - 200
 print("%d,%d" % (ws, hs))
 return x,y
 
#设置登陆窗口属性
window = tk.Tk()
window.title('欢迎使用停车场收费系统')
a,b=window_info()
window.geometry("450x300+%d+%d"%(a,b))
 
#登陆界面的信息
tk.Label(window,text="停车场收费系统",font=("宋体",32)).place(x=80,y=50)
tk.Label(window,text="账号：").place(x=120,y=150)
tk.Label(window,text="密码：").place(x=120,y=190)
#显示输入框
var_usr_name = tk.StringVar()
#显示默认账号
var_usr_name.set('1400370101')
entry_usr_name=tk.Entry(window,textvariable=var_usr_name)
entry_usr_name.place(x=190,y=150)
var_usr_pwd = tk.StringVar()
#设置输入密码后显示*号
entry_usr_pwd = tk.Entry(window,textvariable=var_usr_pwd,show='*')
entry_usr_pwd.place(x=190,y=190)
 
#登陆函数
def usr_login():
 #获取输入的账号密码
 usr_name = var_usr_name.get()
 usr_pwd = var_usr_pwd.get()
 #获取存储的账户信息，此处使用的是数据库，调用数据库查询函数，也可以使用其他方式，如文件等
 dicts = SQL.load('login')
 print(dicts)
 bool = False
 for row in dicts:
 print(row.get("name"))
 if usr_name == row["name"]:
  bool = True
  pwd = row["password"]
  print(row)
 if bool == True:
 if usr_pwd == pwd:
  tk.messagebox.showinfo(title='Welcome', message='How are you?' +usr_name)
  mainwindow()
 else:
  tk.messagebox.showerror(message='对不起，输入错误，请重试！')
 else:
 is_sign_up = tk.messagebox.askyesno('Welcome', '您还没有注册，是否现在注册呢？')
 if is_sign_up:
  usr_sign_up()
#注册账号
def usr_sign_up():
 def sign_to_Pyhon():
 np = new_pwd.get()
 npc = new_pwd_confirm.get()
 nn = new_name.get()
 
 dicts = SQL.load('login')
 print(dicts)
 bool = False
 for row in dicts:
  if nn == row["name"]:
  bool = True
  print(row)
 if np!=npc:
  tk.messagebox.showerror('对不起','两次密码输入不一致！')
 elif bool:
  tk.messagebox.showerror(('对不起','此账号已经存在!'))
 else:
  try:
  SQL.insert_login(str(nn),str(np))
  tk.messagebox.showinfo('Welcome','您已经注册成功！')
  except:
  tk.messagebox.showerror(('注册失败!'))
  window_sign_up.destroy()
 #创建top窗口作为注册窗口
 window_sign_up = tk.Toplevel(window)
 window_sign_up.geometry('350x200')
 window_sign_up.title('注册')
 
 new_name = tk.StringVar()
 new_name.set('1400370115')
 tk.Label(window_sign_up,text='账号:').place(x=80,y=10)
 entry_new_name = tk.Entry(window_sign_up,textvariable=new_name)
 entry_new_name.place(x=150,y=10)
 
 new_pwd = tk.StringVar()
 tk.Label(window_sign_up, text='密码:').place(x=80, y=50)
 entry_usr_pwd = tk.Entry(window_sign_up,textvariable=new_pwd,show='*')
 entry_usr_pwd.place(x=150, y=50)
 
 new_pwd_confirm = tk.StringVar()
 tk.Label(window_sign_up,text='再次输入:').place(x=80,y=90)
 entry_usr_pwd_again = tk.Entry(window_sign_up,textvariable=new_pwd_confirm,show='*')
 entry_usr_pwd_again.place(x=150, y=90)
 
 btn_again_sign_up = tk.Button(window_sign_up,text='注册',command=sign_to_Pyhon)
 btn_again_sign_up.place(x=160,y=130)
 
#登陆和注册按钮
btn_login = tk.Button(window,text="登陆",command=usr_login)
btn_login.place(x=170,y=230)
btn_sign_up = tk.Button(window,text="注册",command=usr_sign_up)
btn_sign_up.place(x=270,y=230)
 
window.mainloop()