Fail to read from `tail -F` via `stdin`
<p>I am trying to parse a growing csv file with the following script <code>parse.py</code>:</p>

<pre><code>import csv
import sys

reader = csv.reader(sys.stdin)
for row in reader:
    print row
</code></pre>

<p>The corresponding command line is <code>tail -F log | python parse.py</code>.</p>

<p>Then I try to append some rows to <code>log</code> with <code>echo "something" &gt;&gt; log</code>.</p>

<p>But <code>parse.py</code> print nothing.</p>

<p>What's wrong with my script?</p>
