擅长:python、mysql、java
<p>我想那样比较好</p>
<pre><code>possilities = {"1":"1 it is!", "2":"2 it is!", "3":"3 it is!"}
choice = ""
while True:
choice = raw_input("pick 1, 2 or 3")
if choice in possilities:
print possilities[choice]
break
else:
print "You should use 1, 2 or 3"
</code></pre>