擅长:python、mysql、java
<p>我将从<a href="https://stackoverflow.com/questions/14381940/python-pair-alphabets-after-loop-is-completed/14382997#14382997">this answer</a>中自行抄袭并添加最大长度:</p>
<pre><code>from itertools import product
def multiletters(seq, max_length):
for n in range(1, max_length+1):
for s in product(seq, repeat=n):
yield ''.join(s)
</code></pre>
<p>这给了</p>
^{pr2}$
<p>等等。在</p>