def Is_Valid():
    UsernameValidity=UserName_Entry.get()
    PasswordValidity=Password_Entry.get()
    cursor.execute('''SELECT password FROM users WHERE username = ?''', (UsernameValidity,))
    cursor.execute('''SELECT username FROM users WHERE password = ?''', (PasswordValidity,))
    LogInAttempt = cursor.fetchone()
    print (Is_Valid) # Testing to see if it works on shell
    if LogInAttempt:
        print (" One of the accounts have successfully logged in ")
        IsValidText.config(text=" You have logged in! ", fg="black", highlightthickness=1)
        myGUI.after(1000, CoreContent)
    else:
        print (" One of the accounts inputted the wrong credentials! ")
        IsValidText.config(text=" Invalid username or Password! ", fg="black", highlightthickness=1)