title: Empty space in between rows after using writer in python
body: <p>I am using csv package now, and every time when I write to a new csv file and open it with excel I will find a empty row in between every two rows.</p>
  
  <pre><code>filereader = csv.reader(open("tests.csv", "r"), delimiter=",")
  filewriter = csv.writer(open("test_step1.csv", "w"), delimiter=",")
  #Delete header
  for row in filereader:
      if row[0].isdigit():
          filewriter.writerow(row)
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/0f5zj.png" alt="enter image description here"></p>