title: use elements in a list for dataframe names
body: <p>I have a list like this:</p>
  
  <pre><code>network = ['facebook','organic',instagram']
  </code></pre>
  
  <p>And I create 3 dataframes: facebook_count, organic_count, instagram_count that each  type of network.</p>
  
  <pre><code>facebook_count = df[df.isin(['facebook installs'])]
  organic_count = df[df.isin(['organic installs'])]
  instagram_count = df[df.isin(['instagram installs'])]
  </code></pre>
  
  <p>so is there a way that write a iteration that create these 3 dataframes at once?
  I write something like this:</p>
  
  <pre><code>for i in range(len(network)+1):
      network[i]+'_count' = df[df.isin([network[i]+' installs'])]
  </code></pre>
  
  <p>But it returns a SyntaxError: can't assign to operator</p>