擅长:python、mysql、java
<p>这是我的解决办法</p>
<pre><code>def rec_dig_sum(n):
total = str(sum(map(int, str(n))))
while len(total)>1:
total = str(sum(map(int, total)))
return int(total)
</code></pre>
<p>你可以把<code>map</code>想象成接受<code>map(function, [input1, input2, input3])</code>并返回<code>[function(input1), function(input2), function(input3)]</code></p>