New submission from Jun Wang:
See this simple example:
class A():
def __init__(self, x=None):
self.x = x
@property
def t(self):
return self.x.t
def __getattr__(self, name):
return 'default'
print(A().t)
AttributeError is raised as "'NoneType' object has no attribute 't'". Currently
__getattr__ is called if any AttributeError is raised, so the result of a.t is
*default*, while an AttributeError is the desired behavior.
The most intuitive solution seems to add a subclass of AttributeError, say
AttributeMissError, which triggers __getattr__. At present, I have to do some
tricky and ugly things to __getattribute__ to show where the AttributeError
occurs, or it's quite hard to figure out what happened with no informative
traceback messages.
----------
components: Interpreter Core
messages: 254722
nosy: 王珺
priority: normal
severity: normal
status: open
title: Add a dedicated subclass for attribute missing errors
type: enhancement
versions: Python 3.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25634>
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