C编程如何要求用户输入有效的数量和循环，如果它没有效
代码示例
蟒蛇检查，如果输入()给出了错误
try:
# Note: Python 2.x users should use raw_input, the equivalent of 3.x's input
age = int(input("Please enter your age: "))
except ValueError:
print("Sorry, I didn't understand that.")
else:
if age >= 18:
print("You are able to vote in the United States!")
else:
print("You are not able to vote in the United States.")
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