[Python-checkins] Fix linecache.py add lazycache to __all__ and use dict.clear to clear the cache (GH-4641)
Cheryl Sabella
webhook-mailer at python.org
Sat Jan 25 21:08:05 EST 2020
https://github.com/python/cpython/commit/4515a590a4a4c09231a66e81782f33b4bfcd5054
commit: 4515a590a4a4c09231a66e81782f33b4bfcd5054
branch: master
author: 加和 <ganziqim at live.com>
committer: Cheryl Sabella <cheryl.sabella at gmail.com>
date: 2020-01-25T21:07:40-05:00
summary:
Fix linecache.py add lazycache to __all__ and use dict.clear to clear the cache (GH-4641)
files:
A Misc/NEWS.d/next/Library/2017-12-04-10-14-23.bpo-32173.e0C5dF.rst
M Lib/linecache.py
diff --git a/Lib/linecache.py b/Lib/linecache.py
index 3afcce1f0a145..ddd0abf2cf01d 100644
--- a/Lib/linecache.py
+++ b/Lib/linecache.py
@@ -10,17 +10,8 @@
import os
import tokenize
-__all__ = ["getline", "clearcache", "checkcache"]
+__all__ = ["getline", "clearcache", "checkcache", "lazycache"]
-def getline(filename, lineno, module_globals=None):
- lines = getlines(filename, module_globals)
- if 1 <= lineno <= len(lines):
- return lines[lineno-1]
- else:
- return ''
-
-
-# The cache
# The cache. Maps filenames to either a thunk which will provide source code,
# or a tuple (size, mtime, lines, fullname) once loaded.
@@ -29,9 +20,17 @@ def getline(filename, lineno, module_globals=None):
def clearcache():
"""Clear the cache entirely."""
+ cache.clear()
- global cache
- cache = {}
+
+def getline(filename, lineno, module_globals=None):
+ """Get a line for a Python source file from the cache.
+ Update the cache if it doesn't contain an entry for this file already."""
+
+ lines = getlines(filename, module_globals)
+ if 1 <= lineno <= len(lines):
+ return lines[lineno - 1]
+ return ''
def getlines(filename, module_globals=None):
@@ -56,11 +55,10 @@ def checkcache(filename=None):
if filename is None:
filenames = list(cache.keys())
+ elif filename in cache:
+ filenames = [filename]
else:
- if filename in cache:
- filenames = [filename]
- else:
- return
+ return
for filename in filenames:
entry = cache[filename]
@@ -109,8 +107,10 @@ def updatecache(filename, module_globals=None):
# for this module.
return []
cache[filename] = (
- len(data), None,
- [line+'\n' for line in data.splitlines()], fullname
+ len(data),
+ None,
+ [line + '\n' for line in data.splitlines()],
+ fullname
)
return cache[filename][2]
diff --git a/Misc/NEWS.d/next/Library/2017-12-04-10-14-23.bpo-32173.e0C5dF.rst b/Misc/NEWS.d/next/Library/2017-12-04-10-14-23.bpo-32173.e0C5dF.rst
new file mode 100644
index 0000000000000..fc8f36fb02194
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2017-12-04-10-14-23.bpo-32173.e0C5dF.rst
@@ -0,0 +1,3 @@
+* Add `lazycache` function to `__all__`.
+* Use `dict.clear` to clear the cache.
+* Refactoring `getline` function and `checkcache` function.
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