""" example of conversion from Python 2.x to Python 3

"""

def write_file(filename, version, data):
    try:
        outfile = open(filename, "wb")
        outfile.write("%s\n"% (version))
        outfile.write(data)
        outfile.close()

    except StandardError, e:
        print e

def read_file(filename): 
    infile = open(filename, "rb")
    file_version = infile.readline()
    data = infile.read()
    major_version = int(file_version[0])
    minor_version = int(file_version[2])
    
    if major_version <> 1 or minor_version > 5:
        raise Exception, "Wrong file version"

    infile.close()
    return file_version, data

if __name__ == "__main__":
    version = "1.1"
    filename = raw_input("Please enter a filename: ")
    write_file(filename, version, "this is test data")
    print "File created, reading data from file"
    new_version, data = read_file(filename)
    cents = 73L
    quarters = cents / 25
    print "%d cents contains %d quarters" % (cents, quarters)

    new_dict = {}
    if not new_dict.has_key(new_version):
        new_dict[new_version] = filename