擅长:python、mysql、java
<p>它被用作<code>try...except</code>语句。你没有<code>try:</code>。在</p>
<pre><code>while True:
try:
userlow = int(raw_input('num please'))
userhigh = int(raw_input('num please'))
loopmult = int(raw_input('enter a num please'))
except ValueError:
print 'ERROR: Integer only'
if userlow < userhigh: break
</code></pre>
<p>阅读更多信息<a href="http://docs.python.org/tutorial/errors.html#handling-exceptions" rel="nofollow">from the documentation</a>。在</p>