擅长:python、mysql、java
<p>首先,它将是<code>str</code>,而不是转换为字符串类型的字符串。其次,你不需要这些转换。在</p>
<pre><code>httpurl = 'http://www.google.com/' # This is a string, no need to cast
ext = '.mp3' # this is a string, no need to cast
for mp3 in range(1, 332):
final = "{url}{mp3}{ext}".format(url=httpurl, mp3=mp3, ext=ext)
print final
</code></pre>