title: Modify only a specific part of a file
body: <p>I have a python script that is supposed to read a file. The issue is that that file is very large so for efficiency I decided that my script should only read from line 650000 and onward, since previous line does not contain relevant information.</p>
  
  <p>Is there any way to only modify lines 650000 till eof, so for example, if i <code>read()</code> this file only those specific lines would appear?</p>