关于from os.path import exists

Question

from sys import argv from os.path import existsscrip,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