《笨辦法學python》習題17:更多檔案操作
阿新 • • 發佈:2019-02-16
from sys import argv from os.path import exists #我們 import 了又一個很好用的命令 exists。這個命令將檔名字串作為引數,如果檔案存在的話,它將返回 True,否則將返回 False。 script, from_file, to_file = argv print "Copying from %s to %s" % (from_file, to_file) # we could do these two on one line too, how? input = open(from_file) indata = input.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() output = open(to_file, 'w') #將from_file的內容複製到to_file output.write(indata) print "Alright, all done." output.close() input.close()