Python-不希望字母或数字超出输入范围

Question

我希望程序只允许使用数字 1-4 作为输入，而不允许使用该范围之外的任何字母或数字。这是我现在的代码，但它不起作用:

 # Get the user's choice.
 choice = int(input("what would you like to do ? "))

 # Validate the choice.
 while choice < 1 or choice > 4:
    try:
        choice = int(raw_input("Enter a valid choice: "))
    except ValueError:
        print ("Please enter a numeric value.")

 # return the user's choice.
 return choice

Answer 1

这是您的解决方案

while True:
    try:
        choice = int(input("what would you like to do ? "))
    except ValueError:
        print ("Invalid choice.Valid choises are between 1-4.")
        continue
    if choice<1 or 4<choice:
        print ("Invalid choice.Valid choises are between 1-4.")
        continue
    else:
        print ("some codes will work on here..")