Question

嗯，我对编程很陌生，我需要一些关于此代码的帮助。

roundvalue = True
rounds = 0
while roundvalue == True:
 rounds= input("Pick a number of rounds (3 or 5)")
try:
    int(rounds)
except ValueError:
    try:
        float(rounds)
    except ValueError:
        print ("This is not a number")

    if rounds  ==  3:
       print("You chose three rounds!")
       roundvalue = False
    elif rounds == 5:
        print ("You chose 5 rounds")
        roundvalue = False
    else:
        print ("Input again!")

代码的要点是选择一些轮次，如果用户输入任何其他内容（字母或数字不是3或5），它应该重复这个问题。 *（我的代码目前正在重复'选择一些轮次（3或5）'

Answer 1

这将以更简洁的方式达到预期的效果。

while True:
    rounds = input("Pick a number of rounds (3 or 5)")
    try:
        rounds = int(rounds)
        if rounds in [3,5]:
            break
    except ValueError:
        print("This is not a number")
    print("Input again!")
print ("You chose %d rounds" % rounds)

Answer 2

首次尝试时，您应该将rounds = int(rounds)放在rounds = float(round).

下面的试试中

使用适当的缩进检查：

roundvalue = True
rounds = 0 
while roundvalue == True:
    rounds= input("Pick a number of rounds (3 or 5)")
    try:
        rounds = int(rounds)
    except ValueError:
        print ("This is not a number")

    if rounds  ==  3:
        print("You chose three rounds!")
        roundvalue = False
    elif rounds == 5:
        print ("You chose 5 rounds")
        roundvalue = False
    else:
        print ("Input again!")

尝试代码中的功能

2 个答案: