[issue47234] PEP-484 "numeric tower" approach makes it hard/impossible to specify contracts in documentation

[Alex Waygood]

Alex Waygood  added the comment:

Please try to make your messages more concise.

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[issue47250] New object.__getstate__() method introduced refleaks

[Alex Waygood]

Change by Alex Waygood :


--
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object.__getstate__() method introduced refleaks

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[issue47237] Inheritance from Protocol with property in dataclass makes them non-instantiatable

[Alex Waygood]

Change by Alex Waygood :


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[issue46134] Confusing error message for AttributeError with dataclasses

[Alex Waygood]

Alex Waygood  added the comment:

Closing due to lack of response from OP.

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[issue47212] Minor issues in reported Syntax errors

[Alex Waygood]

Change by Alex Waygood :


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[issue47050] Cannot install Python 3.10.3 on Windows

[Alex Waygood]

Alex Waygood  added the comment:

(My solution for now has been to install python on my other laptop. Thanks for 
the help Steve!)

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[issue47097] Document PEP 646

[Alex Waygood]

Alex Waygood  added the comment:

(Feel free to reopen this issue if there's more to be done, Matthew!)

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[issue47097] Document PEP 646

[Alex Waygood]

Change by Alex Waygood :


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[issue47213] Incorrect location of caret in SyntaxError

[Alex Waygood]

Change by Alex Waygood :


--
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title: arrow at wrong place -> Incorrect location of caret in SyntaxError
type: enhancement -> behavior

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[issue47166] Dataclass transform should ignore TypeAlias variables

[Alex Waygood]

Alex Waygood  added the comment:

I think implementing this would add complexity to the code in dataclasses.py 
(though Eric's the expert!).

For your use case, is it essential that the type alias declaration be inside 
the class scope? Would it be possible for you to simply have the alias 
declaration in the global scope instead?

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[issue46769] Improve documentation for `typing.TypeVar`

[Alex Waygood]

Alex Waygood  added the comment:

Thanks Guido for your insight, and Jelle/Łukasz for the reviews and backports!

I'm on holiday right now, but when I'm back, I'll take a look at maybe 
proposing some minor revisions to PEP 484 as well, as Guido suggests.

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[issue47073] Solution for recursion error when comparing dataclass objects

[Alex Waygood]

Change by Alex Waygood :


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[issue43463] typing.get_type_hints with TYPE_CHECKING imports / getting hints for single argument

[Alex Waygood]

Change by Alex Waygood :


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[issue47067] Add vectorcall for generica alias object

[Alex Waygood]

Change by Alex Waygood :


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[issue32927] Add typeshed documentation for unittest.TestCase._feedErrorsToResult and ._outcome

[Alex Waygood]

Alex Waygood  added the comment:

Typeshed maintainer here: I agree. Feel free to open an issue over at 
https://github.com/python/typeshed if this is still a problem!

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[issue433030] SRE: Atomic Grouping (?>...) is not supported

[Alex Waygood]

Change by Alex Waygood :


--
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[issue31552] IDLE: Convert browsers to use ttk.Treeview

[Alex Waygood]

Change by Alex Waygood :


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[issue47022] PEP 594: Document removal of asynchat, asyncore and smtpd

[Alex Waygood]

Change by Alex Waygood :


--
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[issue47050] Cannot install Python 3.10.3 on Windows

[Alex Waygood]

Alex Waygood  added the comment:

Hmm, well if I try running the 3.10.2 installer, it now presents me with an 
error message saying that "a newer version of Python 3.10 is already installed".

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[issue47050] Cannot install Python 3.10.3 on Windows

[Alex Waygood]

Alex Waygood  added the comment:

> Looks like you may have "cleaned up" your package cache at some point, which 
> means you can't uninstall the old version anymore.

Not knowingly!

> Try getting the 3.10.2 installer and running it directly.

Thanks, I'll have a go.

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[issue47050] Cannot install Python 3.10.3 on Windows

[Alex Waygood]

Alex Waygood  added the comment:

Attaching the log file from the installation.

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[issue47050] Cannot install Python 3.10.3 on Windows

[Alex Waygood]

New submission from Alex Waygood :

I have tried several times now to upgrade to Python 3.10.3 using the 64-bit 
installer for Windows at https://www.python.org/downloads/release/python-3103/. 
Each time, I encounter an error message stating that "The feature you are 
trying to use is on a network resource that is unavailable". Further error 
messages include statements that "The older version of Python 3.10.3 Test Suite 
(64-bit) cannot be removed", and finally, "0x80070643 - Fatal error during 
installation".

Screenshots of the full error messages are attached.

Hardware details:
- Microsoft Windows 10 Home, Version 10.0.19043 Build 19043
- A x64-based PC
- An HP Pavilion Notebook laptop
- Processor AMD A8-7410 APU

Does anybody have any idea what might be going wrong?

I initially tried installing Python 3.10.3 with 3.10.2 still installed, but 
have now uninstalled Python 3.10.2 from my machine. It has made no difference.

--
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priority: normal
severity: normal
status: open
title: Cannot install Python 3.10.3 on Windows
versions: Python 3.10
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[issue46769] Improve documentation for `typing.TypeVar`

[Alex Waygood]

Change by Alex Waygood :


--
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[issue47015] Update tests from asyncore to asyncio

[Alex Waygood]

Change by Alex Waygood :


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[issue43721] Documentation of property.{getter, setter, deleter} fails to mention that a *new* property is returned

[Alex Waygood]

Change by Alex Waygood :


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[issue47016] Create a test verifying bundled pip and setuptools wheels

[Alex Waygood]

Change by Alex Waygood :


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[issue47006] PEP 646: Decide on substitution behavior

[Alex Waygood]

Change by Alex Waygood :


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[issue46961] Caching/interning of small ints sometimes fails

[Alex Waygood]

Change by Alex Waygood :


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[issue46982] Error in the experts list

[Alex Waygood]

Change by Alex Waygood :


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[issue46198] Duplicate and unused code in tests

[Alex Waygood]

Change by Alex Waygood :


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[issue46198] Duplicate and unused code in tests

[Alex Waygood]

Change by Alex Waygood :


--
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[issue46581] _typevar_types and _paramspec_tvars are missing from _GenericAlias.copy_with

[Alex Waygood]

Change by Alex Waygood :


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[issue43224] Add support for PEP 646

[Alex Waygood]

Change by Alex Waygood :


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[issue46581] _typevar_types and _paramspec_tvars are missing from _GenericAlias.copy_with

[Alex Waygood]

Change by Alex Waygood :


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[issue46677] TypedDict docs are incomplete

[Alex Waygood]

Change by Alex Waygood :


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[issue43923] Can't create generic NamedTuple as of py3.9

[Alex Waygood]

Alex Waygood  added the comment:

I agree with Jelle — a valid protocol cannot inherit from a concrete type, and 
the whole point of NamedTuple is that it creates a tuple subclass (and tuple is 
obviously a concrete type).

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[issue46967] Type union for except

[Alex Waygood]

Change by Alex Waygood :


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[issue43923] Can't create generic NamedTuple as of py3.9

[Alex Waygood]

Alex Waygood  added the comment:

+1 for the more minimal changeset proposed in PR 31781. I've never felt a need 
for NamedTuple multiple inheritance other than with Generic, so wouldn't be 
opposed to restricting it only to Generic.

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[issue46961] Caching/interning of small ints sometimes fails

[Alex Waygood]

Alex Waygood  added the comment:

I think this might be a duplicate of Issue46361?

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[issue45680] Documentation on `GenericAlias` objects and `__class_getitem__` could be improved

[Alex Waygood]

Alex Waygood  added the comment:

Thanks so much to Ken, Łukasz, Jelle, Guido, and everybody else who helped 
review these PRs!

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[issue46769] Improve documentation for `typing.TypeVar`

[Alex Waygood]

Change by Alex Waygood :


--
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pull_requests: +29830
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/31712

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[issue46938] dataclass __post_init__ recursion

[Alex Waygood]

Change by Alex Waygood :


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[issue43923] Can't create generic NamedTuple as of py3.9

[Alex Waygood]

Alex Waygood  added the comment:

I sense we'll have to agree to disagree on the usefulness of NamedTuples in the 
age of dataclasses :)

For me, I find the simplicity of the underlying idea behind namedtuples — 
"tuples with some properties bolted on" — very attractive. Yes, standard tuples 
are more performant, but it's great to have a tool in the arsenal that's 
essentially the same as a tuple (and is backwards-compatible with a tuple, for 
APIs that require a tuple), but can also, like dataclasses, be 
self-documenting. (You're right that DoneAndNotDoneFutures isn't a great 
example of this.)

But I agree that this shouldn't be a priority if it's hard to accomplish; and 
there'll certainly be no complaints from me if energy is invested into making 
dataclasses faster.

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[issue43923] Can't create generic NamedTuple as of py3.9

[Alex Waygood]

Change by Alex Waygood :


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[issue43923] Can't create generic NamedTuple as of py3.9

[Alex Waygood]

Alex Waygood  added the comment:

Consider the typeshed stub for `concurrent.futures.DoneAndNotDoneFutures`. At 
runtime this is a `collections.namedtuple`, but in the stub, we need it to be 
generic to allow precise type inference. But we can't have a generic 
NamedTuple, so the stub is currently this:

```
class DoneAndNotDoneFutures(Sequence[set[Future[_T]]]):
@property
def done(self) -> set[Future[_T]]: ...
@property
def not_done(self) -> set[Future[_T]]: ...
def __new__(_cls, done: set[Future[_T]], not_done: set[Future[_T]]) -> 
DoneAndNotDoneFutures[_T]: ...
def __len__(self) -> int: ...
@overload
def __getitem__(self, __i: SupportsIndex) -> set[Future[_T]]: ...
@overload
def __getitem__(self, __s: slice) -> DoneAndNotDoneFutures[_T]: ...
```

Until two days ago, this stub actually had a bug: `done` and `not_done` were 
both given as writeable attributes, whereas they are read-only properties at 
runtime.

With generic NamedTuples, we could write the stub for the class far more simply 
(and more accurately) like this:

```
class DoneAndNotDoneFutures(NamedTuple, Generic[_T]):
done: set[Future[_T]]
not_done: set[Future[_T]]
```

And in code that actually needs to run at runtime, I frequently find it 
frustrating that I have to use dataclasses instead of NamedTuples if I want a 
simple class that just happens to be generic. dataclasses are great, but for 
small, lightweight classes, I prefer to use NamedTuples where possible. I often 
find that I don't need to use the full range of features dataclasses provide; 
and NamedTuples are often more performant than dataclasses, especially in cases 
where there's a lot of tuple unpacking.

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[issue46930] Iterating over cls.__dict__ in classmethod causes RuntimeError when printing __annotations__

[Alex Waygood]

Change by Alex Waygood :


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versions: +Python 3.11

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[issue46927] Improve error message for subscripting non-generic types

[Alex Waygood]

Change by Alex Waygood :


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[issue44863] Allow TypedDict to inherit from Generics

[Alex Waygood]

Change by Alex Waygood :


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[issue44863] Allow TypedDict to inherit from Generics

[Alex Waygood]

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[issue43923] Can't create generic NamedTuple as of py3.9

[Alex Waygood]

Alex Waygood  added the comment:

> Is there an actual use case that broke?

No, because this was never usable in the first place. But there are those who 
wish it were usable :)

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[issue43923] Can't create generic NamedTuple as of py3.9

[Alex Waygood]

Alex Waygood  added the comment:

I actually have quite a few use cases for this feature. It's true that type 
checkers don't (yet) support it, but that doesn't mean that it should be 
disallowed at runtime. In fact, allowing it at runtime will surely give type  
checkers room to experiment with implementing this feature if it is requested 
by enough users. As it is, they are blocked from doing so.

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[issue45100] Improve help() by making typing.overload() information accessible at runtime

[Alex Waygood]

Alex Waygood  added the comment:

The latest plan sounds good to me. I have some Thoughts on the proposed API, 
but it will be easier to express those as part of a PR review. Looking forward 
to seeing the PR!

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[issue19217] Calling assertEquals for moderately long list takes too long

[Alex Waygood]

Change by Alex Waygood :


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[issue43923] Can't create generic NamedTuple as of py3.9

[Alex Waygood]

Change by Alex Waygood :


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[issue46902] Typo hint message for from-imports?

[Alex Waygood]

Change by Alex Waygood :


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versions:  -Python 3.10

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[issue46876] Walrus operator not in help

[Alex Waygood]

Change by Alex Waygood :


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[issue46876] Walrus operator not in help

[Alex Waygood]

Change by Alex Waygood :


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status: pending -> open
superseder:  -> Assignment expression symbol (walrus) not in built-in help()

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[issue46876] Walrus operator not in help

[Alex Waygood]

Alex Waygood  added the comment:

Thanks for the report! I think this is a duplicate of Issue37082.

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stage: needs patch -> resolved
status: open -> pending

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[issue38854] Decorator with paren tokens in arguments breaks inspect.getsource

[Alex Waygood]

Change by Alex Waygood :


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[issue38854] Decorator with paren tokens in arguments breaks inspect.getsource

[Alex Waygood]

Change by Alex Waygood :


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versions:  -Python 3.7, Python 3.8

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[issue21761] [doc] language reference describes the role of module.__file__ inaccurately

[Alex Waygood]

Alex Waygood  added the comment:

Hi Vidhya — @slateny submitted a PR for this issue only two days ago (you can 
see that it's linked to this BPO issue in the "Pull Requests" field). I think 
it would be good to wait until that has been reviewed before doing any work on 
a possible PR for this issue :)

If you'd like to help out with this issue, you'd of course be very welcome to 
submit a review for @slateny's patch.

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[issue46873] inspect.getsource with some lambdas in decorators does not get the full source

[Alex Waygood]

Change by Alex Waygood :


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type:  -> behavior
versions:  -Python 3.7, Python 3.8

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[issue46873] inspect.getsource with some lambdas in decorators does not get the full source

[Alex Waygood]

Alex Waygood  added the comment:

I'm removing 3.7 and 3.8 from the "versions" field, since they're currently 
only accepting patches for security-related bugs. But thanks for testing on 
those versions as well — that's useful information!

--
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nosy: +AlexWaygood, yselivanov
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versions:  -Python 3.7, Python 3.8

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[issue46851] Document multiprocessing.set_forkserver_preload

[Alex Waygood]

Alex Waygood  added the comment:

(3.7 and 3.8 are not accepting patches unless they relate to security issues, 
so I am removing them from the "versions" field.)

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[issue46851] Document multiprocessing.set_forkserver_preload

[Alex Waygood]

Change by Alex Waygood :


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[issue46846] functools.partial objects should set __signature__ and _annotations__

[Alex Waygood]

Change by Alex Waygood :


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[issue46847] functools.update_wrapper doesn't understand partial objects and annotations

[Alex Waygood]

Change by Alex Waygood :


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[issue45100] Improve help() by making typing.overload() information accessible at runtime

[Alex Waygood]

Alex Waygood  added the comment:

I'd dearly like better introspection tools for functions decorated with 
@overload, but I'd rather have a solution where:

- inspect.signature doesn't have to import typing. That doesn't feel worth it 
for users who aren't using typing.overload, but inspect.signature would have to 
import typing whether or not @overload was being used, in order to *check* 
whether @overload was being used.
- The solution could be reused by, and generalised to, other kinds of functions 
that have multiple signatures.

If we create an __overloads__ dunder that stored the signatures of 
multi-signature functions, as Raymond suggests, inspect.signature could check 
that dunder to examine whether the function is a multi-dispatch signature, and 
change its representation of the function accordingly. This kind of solution 
could be easily reused by other parts of the stdlib, like 
@functools.singledispatch, and by third-party packages such as plum-dispatch, 
multipledispatch, and Nikita's dry-python/classes library.

So, while it would undoubtedly be more complex to implement, I much prefer 
Raymond's suggested solution.

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[issue45100] Improve help() by making typing.overload() information accessible at runtime

[Alex Waygood]

Change by Alex Waygood :


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[issue46814] Documentation for constructing abstract base classes is misleading

[Alex Waygood]

Change by Alex Waygood :


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title: Documentation for constructin abstract base classes is misleading -> 
Documentation for constructing abstract base classes is misleading

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[issue46821] Introspection support for typing.overload

[Alex Waygood]

Alex Waygood  added the comment:

Discussion of similar ideas in Issue45100

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[issue46807] Wrong class __annotations__ when field name and type are equal

[Alex Waygood]

Change by Alex Waygood :


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[issue46807] Wrong class __annotations__ when field name and type are equal

[Alex Waygood]

Change by Alex Waygood :


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[issue46754] Improve Python Language Reference based on [Köhl 2020]

[Alex Waygood]

Change by Alex Waygood :


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[issue46754] Improve Python Language Reference based on [Köhl 2020]

[Alex Waygood]

Change by Alex Waygood :


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[issue46754] Improve Python Language Reference based on [Köhl 2020]

[Alex Waygood]

Change by Alex Waygood :


--
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nosy: +AlexWaygood
nosy_count: 1.0 -> 2.0
pull_requests: +29560
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pull_request: https://github.com/python/cpython/pull/29479

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[issue46774] Importlib.metadata.version picks first distribution not latest

[Alex Waygood]

Change by Alex Waygood :


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[issue46769] Improve documentation for `typing.TypeVar`

[Alex Waygood]

New submission from Alex Waygood :

There are three variants of `TypeVar`s:

(1) TypeVars that are neither constrained nor bound: `T = TypeVar("T")`
(2) TypeVars that are bound: `U = TypeVar("U", bound=str)`
(3) TypeVars that are constrained: `V = TypeVar("V", str, bytes)`

The third variant is important for annotating certain functions, such as those 
in the `re` module. However, it has a number of issues (see 
https://github.com/python/typing/discussions/1080 for further discussion):

(1) It has somewhat surprising semantics in many situations.
(2) It is difficult for type checkers to deal with, leading to a number of bugs 
in mypy, for example.
(3) Many users (especially people relatively inexperienced with Python typing) 
reach for constrained TypeVars in situations where using bound TypeVars or the 
@overload decorator would be more appropriate.

Both PEP 484 and the documentation for the typing module, however:

(1) Give examples for variants (1) and (3), but not for variant (2), which is 
treated as something of an afterthought.
(2) Do not mention that TypeVars can be bound to a union of types, which is an 
important point: `T = TypeVar("T", str, bytes)` has different semantics to `T = 
TypeVar("T", bound=str|bytes)`, and often the latter is more appropriate.

--
assignee: docs@python
components: Documentation
messages: 413342
nosy: AlexWaygood, Jelle Zijlstra, docs@python, gvanrossum, kj, sobolevn
priority: normal
severity: normal
stage: needs patch
status: open
title: Improve documentation for `typing.TypeVar`
type: behavior
versions: Python 3.10, Python 3.11, Python 3.9

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[issue46764] Wrapping a bound method with a @classmethod no longer works

[Alex Waygood]

Change by Alex Waygood :


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[issue46741] Docstring for asyncio.protocols.BufferedProtocol appears out of date

[Alex Waygood]

Alex Waygood  added the comment:

Thanks, Andrew! I've submitted a patch.

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[issue46741] Docstring for asyncio.protocols.BufferedProtocol appears out of date

[Alex Waygood]

Change by Alex Waygood :


--
keywords: +patch
pull_requests: +29483
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/31327

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[issue46745] Typo in new PositionsIterator

[Alex Waygood]

Change by Alex Waygood :


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type:  -> behavior

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[issue46747] bisect.bisect/insort don't document key parameter

[Alex Waygood]

Change by Alex Waygood :


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[issue46743] Enable usage of object.__orig_class__ in __init__

[Alex Waygood]

Change by Alex Waygood :


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[issue46741] Docstring for asyncio.protocols.BufferedProtocol appears out of date

[Alex Waygood]

New submission from Alex Waygood :

The docstring for asyncio.protocols.BufferedProtocol includes this paragraph:

"""
Important: this has been added to asyncio in Python 3.7
*on a provisional basis*!  Consider it as an experimental API that
might be changed or removed in Python 3.8.
"""

The main branch is now 3.11, and the class has not yet been removed, so I'm 
guessing it's now safe to say that it's here to stay?

--
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components: Documentation, asyncio
messages: 413196
nosy: AlexWaygood, asvetlov, docs@python, yselivanov
priority: normal
severity: normal
status: open
title: Docstring for asyncio.protocols.BufferedProtocol appears out of date
type: behavior
versions: Python 3.10, Python 3.11, Python 3.9

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[issue46739] dataclasses __eq__ isn't logical

[Alex Waygood]

Change by Alex Waygood :


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[issue46733] pathlib.Path methods can raise NotImplementedError

[Alex Waygood]

Alex Waygood  added the comment:

I suppose it might also be worth considering moving `owner()` and `group()` to 
PosixPath. In practice, these unconditionally raise NotImplementedError on 
Windows, since the pwd and grp modules are not available on Windows. So, in an 
ideal world, they probably wouldn't exist on the common base class.

Again, though, that needs to be weighed against backwards-compatibility 
considerations.

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[issue46733] pathlib.Path methods can raise NotImplementedError

[Alex Waygood]

Alex Waygood  added the comment:

Here's my two cents, as a non-expert when it comes to pathlib:

I'm not really sure why `is_mount()` exists on WindowsPath objects, given that 
it unconditionally raises `NotImplementedError` on WindowsPath objects -- that 
seems *very* strange to me. It seems to me like it should probably be a method 
on the `PosixPath` class rather than on the `Path` class.

The other methods that raise NotImplementedError don't seem as egregious, 
because none of them *unconditionally* raise NotImplementedError. We could 
debate whether some of them would raise different errors in an ideal world, but 
changing them now might have implications for backwards compatibility, and it 
doesn't seem like a *major* issue to me.

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[issue46733] pathlib.Path methods can raise NotImplementedError

[Alex Waygood]

Change by Alex Waygood :


--
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stage: patch review -> 

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[issue46733] pathlib.Path methods can raise NotImplementedError

[Alex Waygood]

Change by Alex Waygood :


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pull_requests:  -29461

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[issue46483] `pathlib.PurePath.__class_getitem__` does not return `GenericAlias`

[Alex Waygood]

Change by Alex Waygood :


--
pull_requests: +29441
pull_request: https://github.com/python/cpython/pull/31281

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[issue46718] Feature: itertools: add batches

[Alex Waygood]

Change by Alex Waygood :


--
nosy: +rhettinger, tim.peters
title: Feature: iptertools: add batches -> Feature: itertools: add batches

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[issue46713] Provide a C implementation of collections.abc.KeysView and friends

[Alex Waygood]

Change by Alex Waygood :


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type:  -> performance
versions: +Python 3.11

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[issue46066] Deprecate keyword args syntax for TypedDict definition

[Alex Waygood]

Alex Waygood  added the comment:

@Guido, OP already has — Jelle and I have both reviewed and approved it :)

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[issue46066] Deprecate keyword args syntax for TypedDict definition

[Alex Waygood]

Alex Waygood  added the comment:

Just so that all the discussion related to this issue can be found in one 
place, here's a summary:

- After opening this ticket, OP opened an issue in the python/typing 
repository, where the idea of deprecating this syntax received many thumbs-up 
reactions, and where there were no dissenting voices: 
https://github.com/python/typing/issues/981
- The initial impetus for this change was this mypy bug report: 
https://github.com/python/mypy/issues/11555
- Mypy's policy since January 2020 has been that it would be more trouble than 
it's worth to attempt to support the kwargs-based syntax: 
https://github.com/python/mypy/issues/2492#issuecomment-579500959

--

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[issue46622] Support decorating a coroutine with functools.cached_property

[Alex Waygood]

Change by Alex Waygood :


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[issue46333] ForwardRef.__eq__ does not respect module parameter

[Alex Waygood]

Change by Alex Waygood :


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[issue46066] Deprecate keyword args syntax for TypedDict definition

[Alex Waygood]

Change by Alex Waygood :


--
assignee: docs@python -> 
components: +Library (Lib) -Documentation
nosy:  -docs@python
title: Remove keyword args syntax for TypedDict definition -> Deprecate keyword 
args syntax for TypedDict definition
type:  -> behavior
versions: +Python 3.11 -Python 3.10, Python 3.8, Python 3.9

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[issue46665] IDLE Windows shortcuts by default

[Alex Waygood]

Alex Waygood  added the comment:

As a longtime Windows user, I also generally expect ctrl+Y to redo an action in 
most programs, FWIW.

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[issue46637] Incorrect error message: "missing 1 required positional argument"

[Alex Waygood]

Change by Alex Waygood :


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