New submission from Tim Graham:
As requested by Nick [0], this is a usability issue against CPython 3.6 to
provide a better chained TypeError in this case:
class _TokenType(tuple):
parent = None
def __getattr__(self, name):
new = _TokenType(self + (name,))
setattr(self, name, new)
new.parent = self
return new
Token = _TokenType()
Keyword = Token.Keyword
class KeywordCaseFilter(object):
ttype = Keyword
Traceback (most recent call last):
File "test.py", line 14, in <module>
class KeywordCaseFilter(object):
TypeError: '_TokenType' object is not callable
The exception should report the specific object with the problematic
__set_name__ attribute (rather than just passing along the underlying
exception), as well as supporting __set_name__ = None to explicitly disable
further lookup processing.
Follow up to #27366.
[0] https://github.com/andialbrecht/sqlparse/issues/286#issuecomment-248208900
----------
components: Interpreter Core
messages: 277027
nosy: Tim.Graham, ncoghlan
priority: normal
severity: normal
status: open
title: Improve exception reporting for problematic __set_name__ attributes
type: behavior
versions: Python 3.6, Python 3.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28214>
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