Reading and writing python

#I want this code to write to the first file and then take the
#contents of the first file and copy them to the second.

from sys import argv

script, file1, file2 = argv


def write_to_file(fileread, filewrite):
    '''Writes to a file '''
    filewrite.write(fileread)


input_file = open(file1, 'r+w')
output_file = open(file2, 'w')

datain = raw_input(">")
input_file.write(datain)

print input_file.read()

write_to_file(input_file.read(), output_file)