关于from os.path import exists

Question

from sys import argv 

from os.path import exists

scrip,from_file,to_file=argv     #怎么这行是错的？

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

# We ciuld do these two on  one line too, how?

in_file = open(from_file)

indata = in_file.read()

print "The input file is %d bytes long"% len(indata)

print "Does the output file exist? %r" % exists(to_file)

print "Ready, hit REURN to continue, CTRL-C to abort."

raw_input()

out_file = open(to_file,'w')

out_file.write(indata)

print "Alright, all done."

out_file.close()

in_file.close()

Answer 1

你在哪运行的？你运行的时候添加命令行参数没