擅长:python、mysql、java
<p>您可以使用<code>itertools.combinations</code>:</p>
<pre><code>import itertools
s = "qwertyiopnmjk013"
final_letters = [''.join(b) for b in [i for i in itertools.combinations(s, 6)]+[i for i in itertools.combinations(s, 7)] if len(set(b)) == len(b)]
</code></pre>