Staging
v0.8.1
v0.8.1
Revision 960b9b7a2f6e9b4f0e6b692d604c53b3fd2f5d1c authored by Jeffrey Yasskin on 28 February 2008, 04:45:36 UTC, committed by Jeffrey Yasskin on 28 February 2008, 04:45:36 UTC
which forbids constructing types that have it set. The effect is to speed ./python.exe -m timeit -s 'import abc' -s 'class Foo(object): __metaclass__ = abc.ABCMeta' 'Foo()' up from 2.5us to 0.201us. This fixes issue 1762.
1 parent c105289
dircache.py
"""Read and cache directory listings.
The listdir() routine returns a sorted list of the files in a directory,
using a cache to avoid reading the directory more often than necessary.
The annotate() routine appends slashes to directories."""
import os
__all__ = ["listdir", "opendir", "annotate", "reset"]
cache = {}
def reset():
"""Reset the cache completely."""
global cache
cache = {}
def listdir(path):
"""List directory contents, using cache."""
try:
cached_mtime, list = cache[path]
del cache[path]
except KeyError:
cached_mtime, list = -1, []
mtime = os.stat(path).st_mtime
if mtime != cached_mtime:
list = os.listdir(path)
list.sort()
cache[path] = mtime, list
return list
opendir = listdir # XXX backward compatibility
def annotate(head, list):
"""Add '/' suffixes to directories."""
for i in range(len(list)):
if os.path.isdir(os.path.join(head, list[i])):
list[i] = list[i] + '/'
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