[issue31272] typing module conflicts with __slots__-classes

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

It is listed in Misc/NEWS as "minor bug fixes" in typing module, I don't think 
this is something that deserves a separate line in release notes.

--
resolution:  -> out of date
stage:  -> resolved
status: open -> closed

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[issue31272] typing module conflicts with __slots__-classes

[Ilia Korvigo]

Ilia Korvigo added the comment:

Indeed, this issue has been fixed. Anyway, it is not mentioned in any release 
notes. Perhaps, this should be mentioned somewhere. 

> On 25 Aug 2017, at 21:43, Ivan Levkivskyi  wrote:
> 
> 
> Ivan Levkivskyi added the comment:
> 
> I think this is fixed in latest version. I thought it was also backported to 
> Python 3.5.3. What is the version you are using? Could you please try 
> updating to the latest bugfix release? (currently these are 3.5.4 and 3.6.2).
> 
> --
> nosy: +levkivskyi
> 
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[issue31272] typing module conflicts with __slots__-classes

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

I think this is fixed in latest version. I thought it was also backported to 
Python 3.5.3. What is the version you are using? Could you please try updating 
to the latest bugfix release? (currently these are 3.5.4 and 3.6.2).

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nosy: +levkivskyi

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[issue31272] typing module conflicts with __slots__-classes

[Ilia Korvigo]

New submission from Ilia Korvigo:

I've got conflicts between Python's typing system and `__slots__`. Here is a 
small reproducible example.

from typing import TypeVar, Generic, Sequence

T = TypeVar("T")

class TestGeneric(Sequence, Generic[T]):
__slots__ = ("test",)

def __init__(self, test: T):
self.test = [test]

def __iter__(self):
return iter(self.test)
def __len__(self):
return len(self.test)

def __contains__(self, item):
return item in self.test

def __getitem__(self, _):
return self.test[0]

Now whenever I try to specify a content type, e.g.

V = TestGeneric[int]

I get 

ValueError: 'test' in __slots__ conflicts with class variable

I use `Generics`  in classes without slots a lot, hence I think this error has 
to be linked to `__slots__`. Moreover, the same class works fine, if you remove 
the `__slots__`

--
components: Library (Lib)
messages: 300797
nosy: grayfall
priority: normal
severity: normal
status: open
title: typing module conflicts with  __slots__-classes
type: behavior
versions: Python 3.5

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