[issue34850] Emit a syntax warning for "is" with a literal

[Bachsau]

Change by Bachsau :


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nosy:  -Bachsau

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[issue34850] Emit a syntax warning for "is" with a literal

[Bachsau]

Bachsau  added the comment:

This is bullshit. SyntaxWarnings should be raised on problems with the *syntax* 
not for ProgrammerMightBeDumb errors. There are a whole lot of things a 
programmer not knowing the language could do wrong. But these are syntactically 
valid expressions and it is not the purpose of a compiler to teach.

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nosy: +Bachsau

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[issue35504] `del OSError().characters_written` raises `SystemError`

[Bachsau]

Bachsau  added the comment:

Why is it using -1 instead of NULL as the "not-set-indicator"? -1 is a valid 
python integer, that can be assigned, even if it doesn't make sense in the 
context, while `None` can not, because it's missing an `__index__` method.

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[issue35504] `del OSError().characters_written` raises `SystemError`

[Bachsau]

Change by Bachsau :


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title: `del OSError().characters_written` raises SystemError -> `del 
OSError().characters_written` raises `SystemError`

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[issue35504] `del OSError().characters_written` raises SystemError

[Bachsau]

New submission from Bachsau :

`del OSError().characters_written` raises `SystemError`:
"null argument to internal routine"

I don't know why anyone should try this in productive code, but since the 
documentation says, that every `SystemError` should be reported, I'm doing 
that. My suggestion would be to make that attribute behave like the other ones 
of `OSError`, e.g. defaulting to `None` and returning to that value on deletion.

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components: Interpreter Core
messages: 331876
nosy: Bachsau
priority: normal
severity: normal
status: open
title: `del OSError().characters_written` raises SystemError
versions: Python 3.7

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