title: How to concatenate efficiently a list of dataframes?
body: <p>I have a function <code>crawl</code> that input an integer and output a dataframe. To concatenate dataframes <code>df1, df2, df3</code>, we can use <code>pandas.concat([df1, df2, df3])</code>. I would like to ask of there is an efficient way to concatenate <code>df1,..., df17</code> without writing a long list <code>df1 = crawl(1),..., df17 = crawl(17)</code>.</p>
  
  <p>Thank you so much!</p>