title: How to read from .csv and write amendments to other .csv?
body: <p>I'm trying to write a script to update several huge .csv files with this code:</p>
  <pre><code>import csv
  
  f = open('Book1.csv')
  csv_f = csv.reader(f)
  
  for row in csv_f:
      row[1] = row[1].split(&quot;.&quot;)[0]
  </code></pre>
  <p>Can't find a solution to write changes to a separate file Book1_Edited.csv.
  Solutions I've found are either with pandas or rewriting an original file.</p>
  <p>Files content, if necessary:</p>
  <pre><code>Date, Time, Open, High, Low, Last, Volume, NumberOfTrades, BidVolume, AskVolume
  2019/12/30, 14:38:01, 3233.00, 3233.00, 3230.00, 3233.00, 1, 1, 0, 1
  2019/12/30, 14:38:01.1, 3233.25, 3233.00, 3230.00, 3233.25, 2, 1, 0, 2
  2019/12/30, 14:43:13, 3230.00, 3230.25, 3230.00, 3230.00, 1, 1, 1, 0
  2019/12/30, 15:12:47, 3224.50, 3224.75, 3224.50, 3224.50, 2, 1, 2, 0
  2019/12/30, 15:12:47.1, 3224.50, 3224.75, 3224.50, 3224.50, 2, 1, 2, 0
  2019/12/30, 15:12:47.2, 3224.50, 3225.50, 3224.50, 3224.50, 2, 1, 2, 0
  </code></pre>
  <p>Thanks for help</p>