擅长:python、mysql、java
<p>您<code>enemurate</code>而不是范围:</p>
<pre><code> s='abcdefghijklmnopqrstuvwxyz'
sub =''
test =s[0]
for n,value in enumerate(s):
if len(test) > len(sub):
sub = test
if value >= s[n-1]:
test += s[n]
else:
test = s[n]
</code></pre>