# coding: utf-8
        """
        Write to an Existing File
        To write to an existing file, you must add a parameter to the open() function:
        
        "a" - Append - will append to the end of the file
        
        "w" - Write - will overwrite any existing content
        """
        f = open("demofile2.txt", "a")
        f.write("Now the file has more content!")
        f.close()
        
        #open and read the file after the appending:
        f = open("demofile2.txt", "r")
        print(f.read())
        f.close()