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POPandas - How to pass column name in function
 

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  1. POPandas - How to pass column name in function
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    <p>I might be missing something very simple here but I have a function that plots histograms for a certain column from a Pandas dataframe in certain time spans. In my function I want to pass the column name as an argument. This is what I have so far.</p> <pre><code>def make_hist(data,column_name): start=datetime(2013,11,1) end=datetime(2013,11,30) rng=pd.date_range(start,end) start2=datetime(2013,10,1) end2=datetime(2013,10,30) rng2=pd.date_range(start2,end2) start3=datetime(2013,9,1) end3=datetime(2013,9,30) rng3=pd.date_range(start3,end3) start4=datetime(2013,8,1) end4=datetime(2013,8,30) rng4=pd.date_range(start4,end4) start5=datetime(2013,7,1) end5=datetime(2013,7,30) rng5=pd.date_range(start5,end5) start6=datetime(2013,12,1) end6=datetime(2013,12,30) rng6=pd.date_range(start6,end6) plt.subplot(611) data.ix[rng6].column_name.hist(bins=[0,30,60,90,120,150,180,210,240,270,300]).plot() plt.title('December') plt.ylim(0,300) plt.xlim(0,300) plt.subplot(612) data.ix[rng].column_name.hist(bins=[0,30,60,90,120,150,180,210,240,270,300]).plot() plt.title('November') plt.ylim(0,300) plt.xlim(0,300) plt.subplot(613) data.ix[rng2].column_name.hist(bins=[0,30,60,90,120,150,180,210,240,270,300]).plot() plt.title('October') plt.ylim(0,300) plt.xlim(0,300) plt.subplot(614) data.ix[rng3].column_name.hist(bins=[0,30,60,90,120,150,180,210,240,270,300]).plot() plt.title('September') plt.ylim(0,300) plt.xlim(0,300) plt.subplot(615) data.ix[rng4].column_name.hist(bins=[0,30,60,90,120,150,180,210,240,270,300]).plot() plt.title('August') plt.ylim(0,300) plt.xlim(0,300) plt.subplot(616) data.ix[rng5].column_name.hist(bins=[0,30,60,90,120,150,180,210,240,270,300]).plot() plt.title('July') plt.ylim(0,300) plt.xlim(0,300) plt.show() </code></pre> <p>The problem is that I do not know what data type the argument <code>column_name</code> should be. It cannot be a string and it cannot just be a variable because I do not know how I would define it. I feel like there is a simple way to do this that I am just not seeing.</p> <p>EDIT: adding a description of the dataframe. The output of <code>data.dtypes</code> is </p> <pre><code>account int64 first_active object datelatest_inactive datetime64[ns] days_active int64 dtype: object </code></pre> <p>and my index is on the <code>datelatest_inactive</code> column</p>
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    1. COCould you give a small example of your dataframe (say two or three points from every month)? It's always easier to test code when you can see what it's supposed to be acting on.
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    2. COI can't really do that because the data contains very private information. I could give you the output of data.dtypes if that would help
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      1. POPandas - How to pass column name in function
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    3. COThe actual data doesn't matter. Something that we can copy and paste so we don't have to spend time mocking up our own example is considered customary (see [SSCCE.org](http://sscce.org)).
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