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added python3.0-fails-with-multiple-context-managers example

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Mark Pilgrim
2009-08-25 16:51:04 -04:00
parent f83ffbcdcd
commit d06db6d31e
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@@ -499,6 +499,18 @@ C</samp>
<samp class=p>you@localhost:~/diveintopython3/examples$ </samp><kbd>cat out.log</kbd>
<samp>B</samp></pre>
<blockquote class=pf>
<p>Did you get this error?
<pre class='nd screen'>
<samp class=p>you@localhost:~/diveintopython3/examples$ </samp><kbd class=pp>python3 stdout.py</kbd>
<samp class=traceback> File "stdout.py", line 15
with open('out.log', mode='w', encoding='utf-8') as a_file, RedirectStdoutTo(a_file):
^
SyntaxError: invalid syntax</samp></pre>
<p>If so, you&#8217;re probably using Python 3.0. You should really upgrade to Python 3.1.
<p>Python 3.0 supported the <code>with</code> statement, but each statement can only use one context manager. Python 3.1 allows you to chain multiple context managers in a single <code>with</code> statement.
</blockquote>
<p>Let&#8217;s take the last part first.
<pre class=pp><code>print('A')