擅长:python、mysql、java
<p>如果您想维护共同字符数的计数,应该使用<a href="https://docs.python.org/3/library/collections.html#collections.Counter" rel="noreferrer">collections.Counter</a>而不是{<cd1>}。在</p>
<pre><code>from collections import Counter
s2 = 'qsrqq'
s1 = 'qqtrr'
common_letters = Counter(s1) & Counter(s2) # => {'q': 2, 'r': 1}
print(sum(common_letters.values())) # => 3
</code></pre>