title: adding string at the end of the file python
body: <p>Clarification:
  So if my file has 10 lines:
  THe first line is a heading, so I want to append some text at the end of first line</p>
  
  <p>THen I have a list which contains 9 elements..</p>
  
  <p>I want to read that list and append the end of each line with corresponding element..</p>
  
  <p>So basically list[0] to second line, list[1] to third line and so on..</p>
  
  <hr>
  
  <p>I have a file which is delimted by comma.
  something like this:</p>
  
  <pre><code>A,B,C
  0.123,222,942
  ......
  </code></pre>
  
  <p>Now I want to do something like this:</p>
  
  <pre><code>A,B,C,D #append "D" just once
  0.123,222,942,99293
  ............   
  </code></pre>
  
  <p>This "D" is actually saved in a list so yeah I have this "D"
  How do I do this? I mean I know the naive way.
  like go thru each line and do something like</p>
  
  <pre><code>string += str(list[i])
  </code></pre>
  
  <p>Basically how do i append something at the end of the file in pythonic way :)</p>