Pandas concat failing
<p>I am trying to concat dataframes based on the foll. 2 csv files:</p>

<p>df_a: <a href="https://www.dropbox.com/s/slcu7o7yyottujl/df_current.csv?dl=0" rel="noreferrer">https://www.dropbox.com/s/slcu7o7yyottujl/df_current.csv?dl=0</a></p>

<p>df_b: <a href="https://www.dropbox.com/s/laveuldraurdpu1/df_climatology.csv?dl=0" rel="noreferrer">https://www.dropbox.com/s/laveuldraurdpu1/df_climatology.csv?dl=0</a></p>

<p>Both of these have the same number and names of columns. However, when I do this:</p>

<pre><code>pandas.concat([df_a, df_b])
</code></pre>

<p>I get the error:</p>

<pre><code>AssertionError: Number of manager items must equal union of block items
# manager items: 20, # tot_items: 21
</code></pre>

<p>How to fix this?</p>