Why does not work pandas df.loc + lambda?
<p>I have created pandas frame from csv file.
And I want to select rows use lambda.
But it does not work.
I use <a href="http://pandas.pydata.org/pandas-docs/stable/indexing.html#selection-by-callable" rel="nofollow noreferrer">this pandas manual</a>.
<a href="https://i.stack.imgur.com/mR6li.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mR6li.jpg" alt="enter image description here"></a>
exception: 
<a href="https://i.stack.imgur.com/WMBFb.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WMBFb.jpg" alt="enter image description here"></a></p>

<p>what is problem?
thanks.</p>