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Issue #18149: Add filecmp.clear_cache() to manually clear the filecmp cache.

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Patch by Mark Levitt
This commit is contained in:
Ned Deily 2013-06-14 15:19:11 -07:00
parent 3fe35e6503
commit 7bff3cbe3d
5 changed files with 32 additions and 3 deletions
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11
Lib/filecmp.py
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@ -6,6 +6,7 @@ Classes:
Functions:
cmp(f1, f2, shallow=True) -> int
cmpfiles(a, b, common) -> ([], [], [])
clear_cache()
"""
@ -13,7 +14,7 @@ import os
import stat
from itertools import filterfalse
__all__ = ['cmp', 'dircmp', 'cmpfiles', 'DEFAULT_IGNORES']
__all__ = ['clear_cache', 'cmp', 'dircmp', 'cmpfiles', 'DEFAULT_IGNORES']
_cache = {}
BUFSIZE = 8*1024
@ -21,6 +22,9 @@ BUFSIZE = 8*1024
DEFAULT_IGNORES = [
'RCS', 'CVS', 'tags', '.git', '.hg', '.bzr', '_darcs', '__pycache__']
def clear_cache():
"""Clear the filecmp cache."""
_cache.clear()
def cmp(f1, f2, shallow=True):
"""Compare two files.
@ -39,7 +43,8 @@ def cmp(f1, f2, shallow=True):
True if the files are the same, False otherwise.
This function uses a cache for past comparisons and the results,
with a cache invalidation mechanism relying on stale signatures.
with a cache invalidation mechanism relying on stale signatures
or by explicitly calling clear_cache().
"""
@ -56,7 +61,7 @@ def cmp(f1, f2, shallow=True):
if outcome is None:
outcome = _do_cmp(f1, f2)
if len(_cache) > 100: # limit the maximum size of the cache
_cache.clear()
clear_cache()
_cache[f1, f2, s1, s2] = outcome
return outcome