擅长:python、mysql、java
<p>您可以使用<code>collections</code>查找重复字符:</p>
<pre><code>import collections
freq = collections.Counter("abcda")
for k in freq:
if freq[k] > 1:
print k # prints "a"
break
</code></pre>
<p>如果只想查找是否有重复(不查找重复字符):</p>
<pre><code>letters = list("abcda")
no_rep = set(letters)
print len(letters) > len(no_rep) # prints 'True' when there are repeating characters
</code></pre>