# coding:utf-8
      """
      File handling is an important part of any web application.
      Python has several functions for creating, reading, updating, and deleting files.
      
      "r" - Read - Default value. Opens a file for reading, error if the file does not exist
      
      "a" - Append - Opens a file for appending, creates the file if it does not exist
      
      "w" - Write - Opens a file for writing, creates the file if it does not exist
      
      "x" - Create - Creates the specified file, returns an error if the file exists
      
      In addition you can specify if the file should be handled as binary or text mode
      
      "t" - Text - Default value. Text mode
      
      "b" - Binary - Binary mode (e.g. images)
      """
      #To open a file for reading it is enough to specify the name of the file:
      
      f = open("demofile.txt")
      
      #The code above is the same as:
      
      f = open("demofile.txt", "rt")
      
      f.close()