title: read write mode python
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/1466000/python-open-built-in-function-difference-between-modes-a-a-w-w-and-r">python open built-in function: difference between modes a, a+, w, w+, and r+?</a>  </p>
  </blockquote>
  
  
  
  <pre><code>try:
      f = open("file.txt", "r")
      try:
          string = f.read()
          line = f.readline()
          lines = f.readlines()
      finally:
          f.close()
  except IOError:
      pass
  
  
  try:
      f = open("file.txt", "w")
      try:
          f.write('blah') # Write a string to a file
          f.writelines(lines) # Write a sequence of strings to a file
      finally:
          f.close()
  except IOError:
      pass
  </code></pre>
  
  <p>Hi,</p>
  
  <p>this is mode which i can read and write file but i want to open file once and perform both read and write operation in python</p>