tkinter 12 登录窗口

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• # coding=gbk
  # 重点：  1. tkinter.Tk() 创建窗口
  #           tkinter.Toplevel(a) 创建窗口，在窗口a的顶端
  #        2. 以字典的形式保存账户和密码
  #               exist_usr_info[nn] = np
  #               usrs_info = {'admin': 'admin'}
  #        3. with语句可以自动关闭资源
  #               with open('usrs_info.pickle', 'wb') as usr_file:
  #                 pickle.dump(exist_usr_info, usr_file)
  
  # 图片下载：https://github.com/MorvanZhou/tutorials/tree/master/tkinterTUT/tk15_login_example
  import tkinter as tk
  from tkinter import messagebox  # import this to fix messagebox error
  import pickle
  
  window = tk.Tk()
  window.title('Welcome to Mofan Python')
  window.geometry('450x300')
  
  # welcome image
  canvas = tk.Canvas(window, height=200, width=500)
  image_file = tk.PhotoImage(file='welcome.gif')
  image = canvas.create_image(0,0, anchor='nw', image=image_file)
  canvas.pack(side='top')
  
  # User name标签和输入框
  # Password标签和输入框
  tk.Label(window, text='User name: ').place(x=50, y= 150)
  tk.Label(window, text='Password: ').place(x=50, y= 190)
  var_usr_name = tk.StringVar()
  var_usr_name.set('example@python.com')
  entry_usr_name = tk.Entry(window, textvariable=var_usr_name)
  entry_usr_name.place(x=160, y=150)
  var_usr_pwd = tk.StringVar()
  entry_usr_pwd = tk.Entry(window, textvariable=var_usr_pwd, show='*')
  entry_usr_pwd.place(x=160, y=190)
  
  def usr_login():
      usr_name = var_usr_name.get()
      usr_pwd = var_usr_pwd.get()
      try:
          with open('usrs_info.pickle', 'rb') as usr_file:# with语句可以自动关闭资源
              usrs_info = pickle.load(usr_file)
      except FileNotFoundError:
          with open('usrs_info.pickle', 'wb') as usr_file:
              usrs_info = {'admin': 'admin'} # 以字典的形式保存账户和密码
              pickle.dump(usrs_info, usr_file)
      if usr_name in usrs_info:
          if usr_pwd == usrs_info[usr_name]:
              tk.messagebox.showinfo(title='Welcome', message='How are you? ' + usr_name)
          else:
              tk.messagebox.showerror(message='Error, your password is wrong, try again.')
      else:
          is_sign_up = tk.messagebox.askyesno('Welcome',
                                 'You have not signed up yet. Sign up today?')
          if is_sign_up:
              usr_sign_up()
  
  # 第一个窗口的Sign up按钮绑定的命令
  def usr_sign_up():
      # 第二个窗口的Sign up按钮绑定的命令
      def sign_to_Mofan_Python():
          np = new_pwd.get()
          npf = new_pwd_confirm.get()
          nn = new_name.get()
          with open('usrs_info.pickle', 'rb') as usr_file:
              exist_usr_info = pickle.load(usr_file)
          if np != npf:
              tk.messagebox.showerror('Error', 'Password and confirm password must be the same!')
          elif nn in exist_usr_info:
              tk.messagebox.showerror('Error', 'The user has already signed up!')
          else:
              # 以字典的形式保存账户和密码
              exist_usr_info[nn] = np
              # with语句可以自动关闭资源
              with open('usrs_info.pickle', 'wb') as usr_file:
                  pickle.dump(exist_usr_info, usr_file)
              tk.messagebox.showinfo('Welcome', 'You have successfully signed up!')
              window_sign_up.destroy()
      # tkinter.Tk() 创建窗口
      # tkinter.Toplevel(a) 创建窗口，在窗口a的顶端
      window_sign_up = tk.Toplevel(window)
      window_sign_up.geometry('350x200')
      window_sign_up.title('Sign up window')
  
      # User name标签输入框
      new_name = tk.StringVar()
      new_name.set('example@python.com')
      tk.Label(window_sign_up, text='User name: ').place(x=10, y= 10)
      entry_new_name = tk.Entry(window_sign_up, textvariable=new_name)
      entry_new_name.place(x=150, y=10)
  
      # Password标签输入框
      new_pwd = tk.StringVar()
      tk.Label(window_sign_up, text='Password: ').place(x=10, y=50)
      entry_usr_pwd = tk.Entry(window_sign_up, textvariable=new_pwd, show='*')
      entry_usr_pwd.place(x=150, y=50)
  
      # Confirm password标签输入框
      new_pwd_confirm = tk.StringVar()
      tk.Label(window_sign_up, text='Confirm password: ').place(x=10, y= 90)
      entry_usr_pwd_confirm = tk.Entry(window_sign_up, textvariable=new_pwd_confirm, show='*')
      entry_usr_pwd_confirm.place(x=150, y=90)
  
      # Sign up按钮
      btn_comfirm_sign_up = tk.Button(window_sign_up, text='Sign up', command=sign_to_Mofan_Python)
      btn_comfirm_sign_up.place(x=150, y=130)
  
  # login and sign up button
  btn_login = tk.Button(window, text='Login', command=usr_login)
  btn_login.place(x=170, y=230)
  btn_sign_up = tk.Button(window, text='Sign up', command=usr_sign_up)
  btn_sign_up.place(x=270, y=230)
  
  window.mainloop()