#!/usr/bin/python import os dict = {} for d, fd, fl in os.walk('/home/ahda/Program/'):         for f in fl:                 sufix = os.path.splitext(f)[1][1:]                 if dict.has_key(sufix):                         dict[sufix] += 1                 else:                         dict[sufix] = 1 for item in dict.items():         print "%s : %s" % item

import os import sys import os.path for dirpath, dirnames, filenames in os.walk(startdir):         for filename in filenames:             if os.path.splitext(filename)[1] == '.txt':                filepath = os.path.join(dirpath, filename)                #print("file:" + filepath)                input_file = open(filepath)                text = input_file.read()                input_file.close()                               output_file = open( filepath, 'w')                output_file.write(text)                output_file.close()

import os def swap_extensions(dir, before, after):     if before[:1] != '.': #如果参数中的后缀名没有'.'则加上         before = '.' + before     thelen = -len(before)     if after[:1] != '.':         after = '.' + after     for path, subdir, files in os.walk(dir):         for oldfile in files:             if oldfile[thelen:] == before:                 oldfile = os.path.join(path, oldfile)                 newfile = oldfile[:thelen] + after                 os.rename(oldfile, newfile)                 print oldfile +' changed to ' + newfile if __name__ == '__main__':     import sys     if len(sys.argv) != 4:         print 'Usage:swap_extension.py rootdir before after'         sys.exit(1)     swap_extensions(sys.argv[1], sys.argv[2], sys.argv[3])