我必须循环一个特定的代码块（Python）

Question

我对编码还很陌生，所以请多多包涵。我必须在python中创建一种老虎机，显示0-5的数字，如果玩家获得了特定的数字序列，他们将赢得特定的金额。我已经创建了所有代码来对玩家进行打分并打印出来，但是我无法循环播放该代码块。我想从开始循环（如果want_play ==“ p”和player_score> = 0 ：）这是我的代码：

import random

player_score = 1
round_score = 0

wants_play = input("Press 'P' to play or 'Q' to quit. ")
if wants_play == "p" and player_score >= 0:
        print("you have " + str(player_score) + " pound")
        num1 = random.randint(0, 5)
        num2 = random.randint(0, 5)
        num3 = random.randint(0, 5)
        print("you got numbers:", num1, num2, num3)

        round_score = 0
        player_score = 0.2
        if num1 == num2 or num1 == num3 or num2 == num3:
            round_score = 0.5
        if num1 == num2 and num1 == num3 and num2 == num3:
            round_score = 1
        if num1 == 0 and num2 == 0 and num3 == 0:
            round_score = 5
        if num1 == 1 and num2 == 1 or num1 == 1 and num3 ==1 or num2 == 1 and num3 == 1:
            round_score = -1
        if num1 == 1 and num2 == 1 and num3 == 1:
            round_score = 0
            player_score = 0

        print("you won ", round_score, " pounds!")
        player_score += round_score
        if player_score < 0:
            player_score = 0
else:
    print("Goodbye")
    exit()'''

Answer 1

您无法循环，因为您使用了If指令而不是循环（while / for）如果满足条件，则if指令仅执行一次，否则，它将在else分支上执行一次。如果要循环，则应考虑使用while指令或for指令：

• while指令将在满足while条件的情况下执行其下的所有内容（为true）。

  同时（want_play ==“ p”和player_score> = 0）：打印“你好”

这将打印问候，只要wants_play == "p" and player_score >= 0。它不会停止打印问候，直到其中之一被更改或调用break指令为止。

While( wants_play == "p" and player_score >= 0): 
    print "hello"
    break

将只打印一次问候，因为调用了break关键字，这将终止循环的执行

While( wants_play == "p" and player_score >= 0): 
    print "hello"
    player_score-=1

只要player_score >= 0就会打个招呼；每次执行循环时，减去1的player_score最终将变为<0，即while的执行将结束时

因为您使用了and关键字，所以两个条件都必须满足。如果其中之一不再为真，则while的执行将停止

 wants_play == "p" and player_score >= 0