演示

login.png

代码

import tkinter as tk
import pickle

window = tk.Tk()
window.title('Welcome to Python')
window.geometry('450x300')

welcome image

canvas = tk.Canvas(window,height = 200,width = 500)
image_file = tk.PhotoImage(file = 'wel.gif')
image = canvas.create_image(0,0,anchor = 'nw',image = image_file)
canvas.pack(side = 'top')

user information

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:
usrs_info = pickle.load(usr_file)
except FileNotFoundError:
with open('usrs_info.pickle','wb') as usr_file:
usrs_info = {'admin':'admin'}
pickle.dump(usrs_info,usr_file)
if usr_name in usrs_info:
if usr_pwd == usrs_info[usr_name]:
tk.messagebox.showinfo(title = 'Welcom',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 sign up yet.Sign up today')
if is_sign_up:
usr_sign_up()

def usr_sign_up():
def sign_to_Mofan_Python():
np = new_pwd.get()
npf = new_pwd_confirm.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:
exist_usr_info[nn] = np
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()
window_sign_up = tk.Toplevel(window)
window_sign_up.geometry('350x200')
window_sign_up.title('Sign up window')

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)    

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(150,y = 50)

new_pwd_comfirm = tk.StringVar()
tk.Label(window_sign_up,text = 'Confirm password').place(x = 10,y = 90)
entry_usr_pwd_confirm = tk.Entry(window_sign_up,text = 'Sign up',command = sign_to_Mofan_Python)

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()