Question

我正在尝试学习Python 3，我想知道如何循环...

print("how many cats do you have?")
numCats = input()
try:
    if int(numCats) >= 4:
        print('That is a lot of cats.')
    elif int(numCats) in range(1, 3):
        print('That is not that many cats.')
    elif int(numCats) == 0:
        print("Oh, you have no cats.")
except ValueError:
    print('You did not enter a number.')

我想这样做，当它说，“你没有输入数字。”它会循环回到“你有多少只猫？”

Answer 1

while True:
    print("how many cats do you have?")
    numCats = input()
    try:
        if int(numCats) >= 4:
            print('That is a lot of cats.')
        elif int(numCats) in range(1, 3):
            print('That is not that many cats.')
        elif int(numCats) == 0:
            print("Oh, you have no cats.")
        break
    except ValueError:
        print('You did not enter a number.\n')

这将永远循环（由于while True）并且仅在输入有效数字时继续循环，我们使用break

转义循环

Python 3，需要帮助循环一些东西

1 个答案: