擅长:python、mysql、java
<p>您可以简单地执行以下操作:</p>
<pre><code>valid_options = ['Small', 'Medium' , 'Large' ]
while True:
car_type = input('The car type: ') # input is already str. Any value entered is a string. So no error is going to be raised.
if car_type in valid_options:
break
else:
print('Not a valid option. Valid options are: ', ",".join(valid_options))
print("Thank you. You've chosen: ", car_type)
</code></pre>
<p>这里不需要任何尝试和错误。在</p>