Login Window in Python Tkinter

from tkinter import *

import datetime

root = Tk()

root.geometry("600x400")

welcome = Label(root,

    text="Welcome to Login Page",font="Georgia 20 bold",pady=10).grid(column=1)

user = Label(root,

    text="Username",font="Arial 10 bold",pady=10).grid(padx=10,row=1)

pas = Label(root,

    text="Password",font="Arial 10 bold",pady=10).grid(padx=10,row=2)

phone = Label(root,

    text="Phone",font="Arial 10 bold",pady=10).grid(padx=10,row=3)

email = Label(root,

    text="Email",font="Arial 10 bold",pady=10).grid(padx=10,row=4)

gender = Label(root,

    text="Gender",font="Arial 10 bold",pady=10).grid(row=5)

userval = StringVar()

pasval = StringVar()

phoneval = StringVar()

emailval = StringVar()

userinput = Entry(root,textvariable = userval)

userinput.grid(row=1,column=1,ipadx=50,ipady=2)

pasinput = Entry(root,textvariable = pasval)

pasinput.grid(row=2,column=1,ipadx=50,ipady=2)

phone = Entry(root,textvariable = phoneval)

phone.grid(row=3,column=1,ipadx=50,ipady=2)

email = Entry(root,textvariable = emailval)

email.grid(row=4,column=1,ipadx=50,ipady=2)

def save():

    s = open("save.txt","a")

    s.write(f"\n{datetime.datetime.now()}\t+Username is: {userval.get()}\tPassword: {pasval.get()}\tGender:

{gender()}\tPhone: {phoneval.get()}\tEmail: {emailval.get()}\n")

   

b = Button(text="Submit",command=save

       ,padx=50,bg="orange",font="Georgia 10 bold")

b.grid(row=6,column=1)

checkval = IntVar()

checkval2 = IntVar()

def gender():

    if(checkval):

        return "M"

    elif(checkval2):

        return "F"

    else:

        return "error"

check = Checkbutton(text="M",

    variable=checkval).grid(row=5,column=1)

check2 = Checkbutton(text="F",

    variable=checkval2).grid(row=5,column=2)

root.mainloop()