replace empty datasets
<p>Sorry, I agree that was really poorly written:</p>

<p>Take 2:
I have many columns of data (up to 63) in over 50 datasets.  I am extracting only 3 columns of data that I need and writing it into a new .csv file.  There are a few of my datasets that do not have the third desired column of data.  But that's okay I can leave it blank (or insert another value like "-" or whatever).  I don't want to open all my files to figure out which files have what.  The error message I get when I try to extract data from a non-existent column is:</p>

<pre><code>IndexError: list index out of range
</code></pre>

<p>Is there a loop that I can write to fix this?
I'm really new to python, and in my head it seems easy but when I try to actually do it it's very difficult.</p>

<p>Thanks</p>
