擅长:python、mysql、java
<p>这应该是你想要的。我用的是Python3,但它也可以用Python2</p>
<pre><code>s = 'azcbobobegghakl'
res = ''
tmp = ''
for i in range(len(s)):
tmp += s[i]
if len(tmp) > len(res):
res = tmp
if i > len(s)-2:
break
if s[i] > s[i+1]:
tmp = ''
print("Longest substring in alphabetical order is: {}".format(res))
</code></pre>