title: How to get percentage from how filled a pandas dataframe column is?
body: <p>I want to determine how full each column in a .csv file is, add these to a list in order of how full each column is. The fullness should be expressed as a percentage.</p>
  
  <p>The .csv file is really large, so it would be useful to determine which columns contain a small amount of data, and which contain the most. Therefore the columns that have more data will be more useful to me.</p>
  
  <p>What I've gotten so far:</p>
  
  <pre><code>    import pandas as pd
  
      ranked_list = []
      csv_filepath = r"some_path_here"
      data = pd.read_csv(filepath)
  
      for column in data:
          way_to_calculate_percentage
          ranked_list.append(way_to_calculate_percentage)
  
  print(sorted(ranked_list))
  </code></pre>
  
  <p>I would like to know if there is some way to determine this "way_to_calculate_percentage"</p>
  
  <p>Cheers!</p>