# -*- coding: utf-8 -*-
def guess7():
    """猜數字比7大或比7小"""
    import random as rd
    win = 0
    lose = 0
    while True:
        nCom = rd.randint(1,13)
        guess = input("猜大(b)或小(s)?\n")
        if guess.casefold() == 'b':
            if nCom > 7:
                print("You win. Number =", nCom)
                win = win + 1
            elif nCom < 7:
                print("You lose. Number =", nCom)
                lose = lose + 1
            else:
                print("Game Over. Number =", nCom, "\nWin rate:",win/(win+lose),
                "Lose rate:", lose/(win+lose))
        elif guess.casefold() == 's':
            if nCom > 7:
                print("You lose. Number =", nCom)
                lose = lose + 1
            elif nCom < 7:
                print("You win. Number =", nCom)
                win = win + 1
            else:
                print("Game Over. Number =", nCom, "\nWin rate:",win/(win+lose),
                "Lose rate:", lose/(win+lose))
        else:
            assert guess.casefold() == 'b' or guess.casefold() =='s', "You can only input b or s"