Learning how to copy files with Python. The script also checks the file size in bytes.

from sys import argv
from os.path import exists

script, from_file, to_file = argv

print "Let's copy from %s to %s." % (from_file, to_file)

in_file = open(from_file)
indata = in_file.read()

print "The size is %s bytes in length." % len(indata);
print "Does the target file exist? %r" % exists (to_file)

raw_input()

out_file = open(to_file, 'w')
out_file.write(indata)

in_file.close()
out_file.close()

print "All done."