擅长:python、mysql、java
<p>您可以将<code>sum</code>与<em>嵌套列表理解</em>一起使用,如下所示:</p>
<pre><code>n = 2 # one digit number for usage
count = 5 # count of numbers required from series
my_sum = sum(sum(n*10**j for j in range(i)) for i in range(1, count+1))
# my_sum holds: 24690
</code></pre>
<p>它基于算术计算,不需要从字符串到int的类型转换,因此性能更高效</p>