如何使 try/except 循环直到 true

Question

try:
    int(days)
except:
    print('Invalid input. A integer value was expected. Try again.')
    days = (input("Enter the number of days: ", ))

如何使这个 try 语句循环直到为真？

Answer 1

我建议将您的逻辑放在 try 块中，并且仅在异常时打印错误消息：

while True:
    try:
        days = int(input("Enter the number of days: "))
        break
    except ValueError:
        print("Invalid input. An integer value was expected. Try again.")

此外，您永远不应该使用裸 except。这是不好的做法。

Answer 2

像这样将其包裹在 /some/long/path/and/a/file.txt 循环中：

while

Answer 3

在 int(days) 之后做一个 while 语句和一个变量来结束它：

days = int(input("Enter the number of days: "))
done = False
while done == False:
    try:
        int(days)
        done = True
    except:
        print('Invalid input. A integer value was expected. Try again.')
        days = (input("Enter the number of days: ", ))