擅长:python、mysql、java
<p>使用<code>str.join</code>:</p>
<pre><code>def solve(width):
for i in xrange(width, 0, -1):
print ' '.join([' ']*(width-i) + ['*']*i)
...
>>> solve(5)
* * * * *
* * * *
* * *
* *
*
>>> solve(7)
* * * * * * *
* * * * * *
* * * * *
* * * *
* * *
* *
*
</code></pre>