我对1000迪尔的少量网页缓存进行了研究。任务是计算dirs中的文件总数。输出为：
os.listdir: 0.7268s, 1326786 files found
os.walk: 3.6592s, 1326787 files found
glob.glob: 2.0133s, 1326786 files found
如您所见，os.listdir是最快的三个。并且glog.glob仍然比os.walk完成此任务更快。
来源：
import os, time, glob
n, t = 0, time.time()
for i in range(1000):
n += len(os.listdir("./%d" % i))
t = time.time() - t
print "os.listdir: %.4fs, %d files found" % (t, n)
n, t = 0, time.time()
for root, dirs, files in os.walk("./"):
for file in files:
n += 1
t = time.time() - t
print "os.walk: %.4fs, %d files found" % (t, n)
n, t = 0, time.time()
for i in range(1000):
n += len(glob.glob("./%d/*" % i))
t = time.time() - t
print "glob.glob: %.4fs, %d files found" % (t, n)
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