title: Python to csv with append - continuous numbering
body: <p>I am looping through a number of pages and extract 500 datapoints per page. Now, I am printing the output to a csv file using the ".to_csv" function and the append (mode = a) method to add the 500 entries after each page. All of that works fine. 
  My problem is: python creates a No. column (numbering each row 0,1,2,..). With the append function is starts from 0 again for each new set of 500 datapoints. The questions is: how can I make python use continuous numbering (i.e. 501 datapoint is 501 instead of 0)? </p>
  
  <pre><code>Dataset.to_csv('[path]' + File_name, sep=';', encoding = 'utf- 
  8', mode = 'a')
  </code></pre>