Python - Package os

for (path,dirs,files) in os.walk(path):
    for filename in files:
        #do something here

os. walk(top, topdown=True, onerror=None, followlinks=False)

　　- Generate the file names in a directory tree by walking the tree either top-down or bottom-up. For each directory in the tree rooted at directory top (including top itself), it yields a 3-tuple (dirpath, dirnames, filenames).

for i in os.listdir(os.getcwd()):
    if(os.path.isfile(i)):
        #do something here

os.listdir(path)

 　　- Return a list containing the names of the entries in the directory given by path. The list is in arbitrary order. It does not include the special entries ‘.‘ and ‘..‘ even if they are present in the directory.

Python - Package os

原文：http://www.cnblogs.com/kiddy/p/5186545.html