__author__ = 'zhangcx'import osimport shutilpath = r'C:\Users\zhangcx\Desktop'lst = sorted(os.listdir(path))for i in lst:    a,b = os.path.splitext(i)    b = b[1:]    print('{f}:{ext}'.format(f=a,ext=b))    if b:        olddir = '%s\%s'% (path, i)        newdir = '%s\%s' % (path,b.lower())        if not os.listdir(path).__contains__(b.lower()):            os.mkdir(newdir)        shutil.move(olddir,newdir)        #print(olddir)        #print(newdir)