[issue47054] "SyntaxError: non-default argument follows default argument" should be "parameter"

[Bluenix]

New submission from Bluenix :

Running the code below will produce a SyntaxError with the message: 
"non-default argument follows default argument".

def test(a=None, b):
return b if a is None else a

The issue is that `a` and `b` aren't *arguments*, rather, they are 
*parameters*. The error message should be changed to: "non-default parameter 
follows default parameter".

This change appears simple enough and although it is not something I've found 
to be troublesome, it will help users to use correct keywords (arguments vs. 
parameters) when searching on the internet.

--
components: Interpreter Core
messages: 415463
nosy: Bluenix2
priority: normal
severity: normal
status: open
title: "SyntaxError: non-default argument follows default argument" should be 
"parameter"
versions: Python 3.10, Python 3.7, Python 3.8, Python 3.9

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[issue47054] "SyntaxError: non-default argument follows default argument" should be "parameter"

[Bluenix]

Bluenix  added the comment:

Yes I agree, that would be the best.

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[issue44318] Asyncio classes missing __slots__

[Bluenix]

New submission from Bluenix :

Most of asyncio's classes are missing a __slots__ attribute - for example Lock, 
Event, Condition, Semaphore, BoundedSemaphore all from locks.py; or Future, 
FlowControlMixin, Queue, BaseSubprocessTransport from various other parts of 
asyncio.

--
components: asyncio
messages: 395165
nosy: Bluenix2, asvetlov, yselivanov
priority: normal
severity: normal
status: open
title: Asyncio classes missing __slots__
versions: Python 3.10

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[issue44318] Asyncio classes missing __slots__

[Bluenix]

Bluenix  added the comment:

> What is the problem with this?

The problem is that asyncio *is not* defining __slots__.

> Setting __slots__ in base class is required if you want to get a benefit of 
> setting __slots__ in any of subclasses.

That is my use-case for this.

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[issue44318] Asyncio classes missing __slots__

[Bluenix]

Bluenix  added the comment:

>>> (1).__dict__
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: 'int' object has no attribute '__dict__'
>>> 4.5.__dict__
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: 'float' object has no attribute '__dict__'
>>> 'Hello'.__dict__
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: 'str' object has no attribute '__dict__'
>>> b'50'.__dict__
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: 'bytes' object has no attribute '__dict__'
>>> [2.72, 3.14].__dict__
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: 'list' object has no attribute '__dict__'


> __slots__ allow us to explicitly declare data members (like properties) and 
> deny the creation of __dict__ and __weakref__ (unless explicitly declared in 
> __slots__ or available in a parent.)

>From https://docs.python.org/3/reference/datamodel.html

They don't have __slots__, nor a __dict__ or __weakref__:

>>> (1).__weakref__
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: 'int' object has no attribute '__weakref__'
>>> 4.5.__weakref__
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: 'float' object has no attribute '__weakref__'
>>> 'Hello'.__weakref__
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: 'str' object has no attribute '__weakref__'
>>> b'50'.__weakref__
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: 'bytes' object has no attribute '__weakref__'
>>> [2.72, 3.14].__weakref__
Traceback (most recent call last):
  File "", line 1, in 
AttributeError: 'list' object has no attribute '__weakref__'

They're essentially C extension classes: 
https://docs.python.org/3/extending/newtypes_tutorial.html

I am not sure what this argument was meant to prove.


What would be the downside to adding __slots__ to asyncio's classes? Other than 
that someone can no longer arbitrarily add attributes?

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[issue44318] Asyncio classes missing __slots__

[Bluenix]

Bluenix  added the comment:

My exact use-case is that I am subclassing asyncio.Semaphore to change some 
functionality (override `release()` to do nothing and set up tasks to schedule 
calls to reset the counter). I am expecting *a lot* of these instances so (like 
Serhiy Storchaka nicely put it) I would like to reduce the memory footprint of 
these classes by using __slots__. The issue now becomes that asyncio.Semaphore 
(like most other asyncio classes) have not defined __slots__, this prohibits my 
subclass from taking advantage of __slots__.

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