Nils Bruin added the comment:
One solution is to patch both WeakValueDictionary and WeakKeyDictionary with
their own clear methods where we first store the strong links (to keys, resp.
values) in a list, then clear the underlying dictionaries (this will now
trigger the deletion of the
Nils Bruin added the comment:
I think the difference in behaviour between Py3 and Py2 is coming from:
http://hg.python.org/cpython/file/a26df2d03989/Objects/dictobject.c#l1275
which first clears all values before removing any keys. For a
WeakValueDictionary that means all the weakrefs are
Nils Bruin added the comment:
Have you tried if the fix at issue7105 solves the problem? I don't see the
patch there introduce a `clear` method override for WeakValueDictionary or
WeakKeyDictionary. The one for WeakSet still calls self.data.clear(), which for
dictionaries would still r
New submission from Nils Bruin:
The following program is a little dependent on memory layout but will usually
generate lots of
Exception KeyError: (A(9996),) in ignored
messages in Python 2.7.
import weakref
class A(object):
def __init__(self,n):
self.n=n
Nils Bruin added the comment:
The most straightforward change I can think of is to change the line
if not sourcefile and file[0] + file[-1] != '<>':
to
if not sourcefile and (not file or file[0] + file[-1] != '<>'):
That solves the prob
New submission from Nils Bruin:
It would seem reasonable that an empty filename would be a legitimate way of
indicating that a code object does not have a corresponding source file.
However, if one does that then inspect.findsource raises an unexpected
IndexError rather than the documented
