习题17.md

from sys import argv
from os.path import exists

script,from_file,to_file = argv

print("Copying from %s to %s"%(from_file,to_file))

indata = open(from_file).read()

print("The input file is %d type long"%len(indata))
print("Does the output file exist?%r"%exists(to_file))
print("Ready,hit RETURN to continue,CTRL-C to abort")
input()

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

print("Alright,all done")

out_file.close()
in_file.clse()