issue-25872: Fix KeyError using linecache from multiple threads (GH-18007)
The crash that this fixes occurs when using traceback and other modules from multiple threads;
del cache[filename] can raise a KeyError.
diff --git a/Lib/linecache.py b/Lib/linecache.py
index ddd0abf..fa5dbd0 100644
--- a/Lib/linecache.py
+++ b/Lib/linecache.py
@@ -71,10 +71,10 @@
try:
stat = os.stat(fullname)
except OSError:
- del cache[filename]
+ cache.pop(filename, None)
continue
if size != stat.st_size or mtime != stat.st_mtime:
- del cache[filename]
+ cache.pop(filename, None)
def updatecache(filename, module_globals=None):
@@ -84,7 +84,7 @@
if filename in cache:
if len(cache[filename]) != 1:
- del cache[filename]
+ cache.pop(filename, None)
if not filename or (filename.startswith('<') and filename.endswith('>')):
return []