fileio3.py

def PrintPass(fname):
    # w - write, + means you can read too
    login_file = open(fname, 'r')
    funame = login_file.readline()
    fpasswd = login_file.readline()
    funame = funame.rstrip('\n')
    fpasswd = fpasswd.rstrip('\n')
    login_file.close()
    print('Username = {} \nPassword = {} \n\n'.format(funame, fpasswd))


def Signin(uname, passwd, fname):
    # w - write, + means you can read too
    login_file = open(fname, 'r')
    funame = login_file.readline()
    fpasswd = login_file.readline()
    funame = funame.rstrip('\n')
    fpasswd = fpasswd.rstrip('\n')
    login_file.close()

    if uname != funame or passwd != fpasswd:
        return False
    else:
        return True


def ResetSignin(olduname, oldpass, fname):
    if not Signin(olduname, oldpass, fname):
        print('Wrong username or password:')
        return False  # Fail to update password

    newpass = 'u1'
    newpass2 = 'u2'

    while newpass != newpass2:
        newuname = input('Please Enter New Username: ')
        newpass = input('Please Enter New Password: ')
        newpass2 = input('Please Enter New Password again: ')
        if newpass != newpass2:
            print('Passwords do not match!, pls try again\n')

    login_file = open(fname, 'w')  # w to override
    login_file.write(newuname+'\n')
    login_file.write(newpass+'\n')
    login_file.close()
    return True  # Success


# Main Start Here
uname = input('Enter Username: ')
passwd = input('Enter Password: ')
if not Signin(uname, passwd, 'd:\\game\\login.dat'):
    exit()


ans = -1
while ans != '0':
    print("You are logging in....")
    print()
    print('1- Change Username and Password: ')
    print('2- Print Username and Password: ')
    print('0- Exit')
    ans = input('Please choose (0,1): ')
    if ans == '0':
        exit()
    elif ans == '1':
        olduname = input('Please Enter Old username: ')
        oldpass = input('Please Enter Old password: ')
        status = ResetSignin(olduname, oldpass, 'd:\\game\\login.dat')
        if status == True:
            print('Login Reset Success!')
        else:
            print('Login Reset Fail!')
    elif ans == '2':
        PrintPass('d:\\game\\login.dat')
    else:
        print('Invalid choice, please choose only 0 and 1 : \n\n')