How to make email id (pydroid 3 coding).

from tkinter import *
#defining login function
def login():
uname=username.get()
pwd=password.get()
if uname=='' or pwd=='':
message.set("fill the empty field!!!")
else:
if uname=="abcd@gmail.com" and pwd=="abc123":
message.set("Login success")
else:
message.set("Wrong username or password!!!")
#defining loginform function
def Loginform():
global login_screen
login_screen = Tk()
#Setting title of screen
login_screen.title("Login Form")
#setting height and width of screen
login_screen.geometry("300x250")
#declaring variable
global message;
global username
global password
username = StringVar()
password = StringVar()
message=StringVar()
#Creating layout of login form
Label(login_screen,width="300", text="Please enter details below", bg="orange",fg="white").pack()
Label(login_screen, text="").pack()
Label(login_screen, text="Enter Username * ").pack()
Entry(login_screen, textvariable=username).pack()
Label(login_screen, text="Enter password * ").pack()
Entry(login_screen, textvariable=password ,show="*").pack()
Label(login_screen, text="",textvariable=message).pack()
Button(login_screen, text="Login", width=10, height=1, bg="orange",command=login).pack()
login_screen.mainloop()
#calling function Loginform
Loginform()