小白求python 为啥打印不出来？

from sys import argv
from os.path import exists # This returns True if a file exists.

script, from_file, to_file =argv

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

# we could do these two on one line, 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 RETURN 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 () # don't forgot ()!
in_file.close ()

在powershell测试之后出现：

> python "lesson 17.py" "lesson 17s.txt" "lesson 17s2.txt"
Copying from lesson 17s.txt to lesson 17s2.txt
The input file is 21 bytes long
Does the output file exist? False
Ready, hit RETURN to continue, CTRL-C to abort.
Traceback (most recent call last):
File "lesson 17.py", line 16, in

你用raw_input要自己输入，但是你按了CTRL+C，自然会抛出个异常。

这个没关系吧，其实python自带的idle也可以，你用notepad也行，都好用