New submission from ppperry <[email protected]>:
Take the following code:
import builtins
class K(dict):
def __getitem__(self, k):
if k not in builtins.__dict__:
print("get %s" % k)
return dict.__getitem__(self, k)
def __setitem__(self, k, v):
print("set %s" % k)
dict.__setitem__(self, k, v)
exec("""
foo = "bar"
foo
try:
qyz
except NameError:
pass
class K:
baz = foo
def f(ggg=foo): pass
def g(ggg=foo):
global f
f = 87
f
g()
""",K())
This should consitently either call or not call the overridden methods on the
dictionary, producing either no output or:
set foo
get foo
get qyz
get foo
get foo
set K
get foo
set g
get g
set f
get f
Instead, only sometime the override gets called, producing
set foo
get foo
get qyz
set K
get foo
set g
get g
get f
meaning that
(a) modifications of global variables via global statements
(b) code at class-level
ignore overridden methods, whereas everything else follows them
----------
components: Interpreter Core
messages: 310388
nosy: ppperry
priority: normal
severity: normal
status: open
title: Inconsistent behavior if globals is a dict subclass
versions: Python 3.6
_______________________________________
Python tracker <[email protected]>
<https://bugs.python.org/issue32615>
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