擅长:python、mysql、java
<p>根据<a href="https://docs.python.org/2/library/stdtypes.html#file.truncate" rel="nofollow">^{<cd1>}</a>的文档,默认值为当前位置。您需要通过<code>0</code>。在</p>
<blockquote>
<p>Truncate the file’s size. If the optional size argument is present,
the file is truncated to (at most) that size. <strong>The size defaults to the
current position.</strong> The current file position is not changed. Note that
if a specified size exceeds the file’s current size, the result is
platform-dependent: possibilities include that the file may remain
unchanged, increase to the specified size as if zero-filled, or
increase to the specified size with undefined new content.
Availability: Windows, many Unix variants.</p>
</blockquote>