def getallfiles(dir):
"""遍历获取指定文件夹下面所有文件"""
  if os.path.isdir(dir):
    filelist = os.listdir(dir)
    for ret in filelist:
      filename = dir + "\\" + ret
      if os.path.isfile(filename):
        print filename

def getalldirfiles(dir, basedir):
"""遍历获取所有子文件夹下面所有文件"""
  if os.path.isdir(dir):
    getallfiles(dir)
    dirlist = os.listdir(dir)
    for dirret in dirlist:
      fullname = dir + "\\" + dirret
      if os.path.isdir(fullname):
        getalldirfiles(fullname, basedir)

def getallfiles(dir):
"""使用listdir循环遍历"""
  if not os.path.isdir(dir):
    print dir
    return
  dirlist = os.listdir(dir)
  for dirret in dirlist:
    fullname = dir + "\\" + dirret
    if os.path.isdir(fullname):
      getallfiles(fullname)
    else:
      print fullname

def getallfilesofwalk(dir):
"""使用listdir循环遍历"""
  if not os.path.isdir(dir):
    print dir
    return
  dirlist = os.walk(dir)
  for root, dirs, files in dirlist:
    for file in files:
      print os.path.join(root, file)

from os.path import join, isdir, islink
# We may not have read permission for top, in which case we can't
# get a list of the files the directory contains. os.path.walk
# always suppressed the exception then, rather than blow up for a
# minor reason when (say) a thousand readable directories are still
# left to visit. That logic is copied here.
try:
  # Note that listdir and error are globals in this module due
  # to earlier import-*.
  names = listdir(top)
except error, err:
  if onerror is not None:
    onerror(err)
  return
dirs, nondirs = [], []
for name in names:
  if isdir(join(top, name)):
    dirs.append(name)
  else:
    nondirs.append(name)
if topdown:
  yield top, dirs, nondirs
for name in dirs:
  path = join(top, name)
  if followlinks or not islink(path):
    for x in walk(path, topdown, onerror, followlinks):
      yield x
if not topdown:
  yield top, dirs, nondirs