What's the best way to sum all values in a Pandas dataframe?
<p>I figured out these two methods.  Is there a better one?</p>

<pre><code>&gt;&gt;&gt; import pandas as pd
&gt;&gt;&gt; df = pd.DataFrame({'A': [5, 6, 7], 'B': [7, 8, 9]})
&gt;&gt;&gt; print df.sum().sum()
42
&gt;&gt;&gt; print df.values.sum()
42
</code></pre>

<p>Just want to make sure I'm not missing something more obvious.</p>