New submission from John Firestone <[email protected]>:
exec(source, Dict()) doesn't call Dict().__getitem__ or Dict().__missing__ if
the source string contains a function and the function references an undefined
global.
class Dict1(dict):
def __getitem__(self, key):
print ' __getitem__', repr(key)
if key == 's':
return None
return dict.__getitem__(self, key)
class Dict2(dict):
def __missing__(self, key):
print ' __missing__', repr(key)
return None
source = """if 1:
print ' 1'
s
def f():
print ' 2'
s
print ' 3'
f()"""
print 'Dict1.__getitem__'
try:
exec(source, Dict1())
except NameError as exc_value:
print ' %s: %s' % (exc_value.__class__.__name__, exc_value)
print 'Dict2.__missing__'
try:
exec(source, Dict2())
except NameError as exc_value:
print ' %s: %s' % (exc_value.__class__.__name__, exc_value)
Python 2.7.3 (v2.7.3:70274d53c1dd, Apr 9 2012, 20:32:06)
[GCC 4.0.1 (Apple Inc. build 5493)] on darwin
>>> import curiosity
Dict1.__getitem__
1
__getitem__ 's'
__getitem__ 'f'
2
NameError: global name 's' is not defined
Dict2.__missing__
1
__missing__ 's'
2
NameError: global name 's' is not defined
>>>
----------
components: Interpreter Core
files: curiosity.py
messages: 163095
nosy: johnf
priority: normal
severity: normal
status: open
title: exec of function doesn't call __getitem__ or __missing__ on undefined
global
type: behavior
versions: Python 2.7
Added file: http://bugs.python.org/file26041/curiosity.py
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Python tracker <[email protected]>
<http://bugs.python.org/issue15099>
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