title: python file read
body: <pre><code>def file_open(filename):
      fo=open(filename,'r')
      #fo.seek(5)
      fo.read(3)
      fo.close()
  
  file_open("file_ro.py")
  </code></pre>
  
  <p>I expect above program to return first 3 bytes from file . But it returns nothing. When I ran these in interactive python command prompt - I get expected output!</p>