import tkinter
from tkinter import messagebox
window = tkinter.Tk()
window.title('Sign-in Page')
window.iconbitmap('C:\Users\neel-_000DownloadsIconshock-Cms-User-login.ico')
window.geometry("1200x1200")
window.configure(background='#0B4C5F')
labelfont = ('times', 20, 'bold')
user_info = []
def callback():
    username_2 = username_0.get()
    if not username_2.isalpha() or len(username_2) < 1:
        username = tkinter.Label(text="  Invalid Username", font=('Times New Roman', 12), anchor='center').pack()
        error_message = tkinter.Label(text=" Please Restart Program to Retry").pack()
        import time
        time.sleep(0.5)
        print("Username not accepted")
        not_accepted = tkinter.Label(text='Username has not been accepted, close program and retry')

    else:
        label = tkinter.Label(text= 'Welcome ' + username_2 + ' ! It is good to see you')
        label.pack()
        user_info.append(username_2)
        print("username excepted")


    password_ref = password_0.get()
    if len(password_ref) < 1:
        username = tkinter.Label(text="  Invalid Password", font=('Times New Roman', 12), anchor='center').pack()
        error_message = tkinter.Label(text=" Please Restart Program to Retry").pack()
        import time
        time.sleep(0.5)
        print("Password not accepted")
        pass_not_accepted = tkinter.Label(text='Password has not been accepted, close program and retry')


    else:
        user_info.append(password_ref)
        print("password excepted")

    return callback

username = tkinter.Label(text="Username", font=('Times New Roman', 12), height=1, width=15)
username_0 = tkinter.Entry(window, font=("Times",14))
username.pack()
username.place(x=535, y=271)
username_0.pack()
username_0.place(x=510, y=310, height=25, width=200)
password = tkinter.Label(text='Password', font=('Times New Roman', 12), height=1, width=15)
password_0 = tkinter.Entry(window, show='*', font=('Times', 14))
password.pack()
password.place(x=535, y=360)
password_0.pack()
password_0.place(x = 510, y = 400, height=25, width=200)
button = tkinter.Button(text="Sign In", fg='#0B4C5F', bg='White', command=callback, activebackground="Black",
activeforeground= "white", cursor="circle")
button.flash()
button.pack()
button.place(x=530, y = 450, height=45, width=150)
keep_sign_in = tkinter.Checkbutton(window,text="Keep me logged in")
keep_sign_in.pack()
keep_sign_in.place(x=510, y=500, height=50, width=200)

window.mainloop()