擅长:python、mysql、java
<p>1)Python的作用域由<a href="http://docs.python.org/release/2.5.1/ref/indentation.html" rel="nofollow noreferrer">indentation</a>决定。您的内部代码必须正确缩进:</p>
<pre><code>for md in range(1,5):
for pico in range(21,25):
print "file-md-loop-pico"
</code></pre>
<p>2)使用字符串文字<code>"file-md-loop-pico"</code>,而不是插入变量<code>md</code>和<code>pico</code>。若要<a href="https://stackoverflow.com/questions/5082452/python-string-formatting-vs-format">format your string correctly</a>,请使用:</p>
<pre><code>for md in range(1,5):
for pico in range(21,25):
print "file-{0}-loop-{1}".format(md, pico)
</code></pre>