8000 gh-88965: Fix type substitution of a list of types after initial `ParamSpec` substitution by sobolevn · Pull Request #102808 · python/cpython · GitHub
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gh-88965: Fix type substitution of a list of types after initial ParamSpec substitution #102808

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Merged
merged 5 commits into from
Mar 23, 2023
Merged

gh-88965: Fix type substitution of a list of types after initial ParamSpec substitution #102808

merged 5 commits into from
Mar 23, 2023

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sobolevn
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@sobolevn sobolevn commented Mar 18, 2023 •
edited by bedevere-bot
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I've tried to make tests as complete as I can imagine. But, extra cases and suggestions are welcome! ;)

This change has two parts:

  1. Collecting type parameters from arguments is changed. Now, we analyze the contents of passes tuples
  2. Next, we need to substitute nested tuple. I've reused the existing logic here, but I had to create a method for it

@bedevere-bot bedevere-bot mentioned this pull request Mar 18, 2023
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@sobolevn
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@AlexWaygood you might be interested, since you've originally asked to take a look :)

AlexWaygood
AlexWaygood reviewed Mar 19, 2023
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I think this is the correct solution -- thanks so much for taking a look at this! I have a couple of points about code readability, and a suggestion about the tests:

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@AlexWaygood friendly ping :)

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@AlexWaygood friendly ping :)

I haven't forgotten! It's only been two days 😄

@sobolevn
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It's only been two days

Oh wow, the time is a very strange thing!
Sorry, you became a victim of my regular pushing-PRs-forward process :)

AlexWaygood
AlexWaygood approved these changes Mar 23, 2023
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Looks great to me. I have some ideas about how to clean up the tuple special-casing, but I think that should wait for another PR, as it might not be so backportable.

@AlexWaygood AlexWaygood added type-bug An unexpected behavior, bug, or error needs backport to 3.10 only security fixes stdlib Python modules in the Lib dir topic-typing needs backport to 3.11 only security fixes labels Mar 23, 2023
@AlexWaygood AlexWaygood self-assigned this Mar 23, 2023
@AlexWaygood AlexWaygood merged commit adb0621 into python:main Mar 23, 2023
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Thanks @sobolevn for the PR, and @AlexWaygood for merging it 🌮🎉.. I'm working now to backport this PR to: 3.10, 3.11.
🐍🍒⛏🤖

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Sorry @sobolevn and @AlexWaygood, I had trouble checking out the 3.11 backport branch.
Please retry by removing and re-adding the "needs backport to 3.11" label.
Alternatively, you can backport using cherry_picker on the command line.
cherry_picker adb0621652f489033b9db8d3949564c9fe545c1d 3.11

@AlexWaygood AlexWaygood removed the needs backport to 3.11 only security fixes label Mar 23, 2023
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Sorry, @sobolevn and @AlexWaygood, I could not cleanly backport this to 3.10 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker adb0621652f489033b9db8d3949564c9fe545c1d 3.10

@AlexWaygood AlexWaygood added the needs backport to 3.11 only security fixes label Mar 23, 2023
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Thanks @sobolevn for the PR, and @AlexWaygood for merging it 🌮🎉.. I'm working now to backport this PR to: 3.11.
🐍🍒⛏🤖

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Sorry @sobolevn and @AlexWaygood, I had trouble checking out the 3.11 backport branch.
Please retry by removing and re-adding the "needs backport to 3.11" label.
Alternatively, you can backport using cherry_picker on the command line.
cherry_picker adb0621652f489033b9db8d3949564c9fe545c1d 3.11

@AlexWaygood AlexWaygood added needs backport to 3.11 only security fixes and removed needs backport to 3.11 only security fixes labels Mar 23, 2023
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Thanks @sobolevn for the PR, and @AlexWaygood for merging it 🌮🎉.. I'm working now to backport this PR to: 3.11.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Mar 23, 2023
@sobolevn @AlexWaygood @miss-islington
pythongh-88965: typing: fix type substitution of a list of types afte…
3d006ac 
…r initial `ParamSpec` substitution (pythonGH-102808)

Previously, this used to fail:

```py
from typing import *
T = TypeVar("T")
P = ParamSpec("P")

class X(Generic[P]):
    f: Callable[P, int]

Y = X[[int, T]]
Z = Y[str]
```

(cherry picked from commit adb0621)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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GH-102957 is a backport of this pull request to the 3.11 branch.

@bedevere-bot bedevere-bot removed the needs backport to 3.11 only security fixes label Mar 23, 2023
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AlexWaygood commented Mar 23, 2023 •
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I think backporting this might be quite complex, due to the fact that TypeVarTuple was new in 3.11, meaning a lot of the machinery around substitution changed significantly in 3.11. I glanced at the merge conflicts and they seem nontrivial to resolve.

If you'd like to give it a stab @sobolevn, I'll happily review a backport PR -- but I'm also happy to just leave it unfixed on 3.10.

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Let’s leave 3.10 alone.

@AlexWaygood AlexWaygood removed the needs backport to 3.10 only security fixes label Mar 23, 2023
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Let’s leave 3.10 alone.

Ok, I won't bother then.

Thanks everyone! 👍

miss-islington added a commit that referenced this pull request Mar 23, 2023
@miss-islington @sobolevn @AlexWaygood
gh-88965: typing: fix type substitution of a list of types after init…
1645a40 
…ial `ParamSpec` substitution (GH-102808)

Previously, this used to fail:

```py
from typing import *
T = TypeVar("T")
P = ParamSpec("P")

class X(Generic[P]):
    f: Callable[P, int]

Y = X[[int, T]]
Z = Y[str]
```

(cherry picked from commit adb0621)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
@sobolevn
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sobolevn commented Mar 24, 2023 •
edited
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@AlexWaygood btw, do you have any ideas of issues I can work on? I am out of my backlog :(

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I have one in the back of my head that I'll try to write up today ;)

@sobolevn sobolevn mentioned this pull request Mar 27, 2023
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Fidget-Spinner pushed a commit to Fidget-Spinner/cpython that referenced this pull request Mar 27, 2023
@sobolevn @AlexWaygood @Fidget-Spinner
pythongh-88965: typing: fix type substitution of a list of types afte…
67a48e5 
…r initial `ParamSpec` substitution (python#102808)

Previously, this used to fail:

```py
from typing import *
T = TypeVar("T")
P = ParamSpec("P")

class X(Generic[P]):
    f: Callable[P, int]

Y = X[[int, T]]
Z = Y[str]
```

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
warsaw pushed a commit to warsaw/cpython that referenced this pull request Apr 11, 2023
@sobolevn @AlexWaygood @warsaw
pythongh-88965: typing: fix type substitution of a list of types afte…
a6097ae 
…r initial `ParamSpec` substitution (python#102808)

Previously, this used to fail:

```py
from typing import *
T = TypeVar("T")
P = ParamSpec("P")

class X(Generic[P]):
    f: Callable[P, int]

Y = X[[int, T]]
Z = Y[str]
```

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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@AlexWaygood AlexWaygood AlexWaygood approved these changes

@gvanrossum gvanrossum Awaiting requested review from gvanrossum

@Fidget-Spinner Fidget-Spinner Awaiting requested review from Fidget-Spinner

@JelleZijlstra JelleZijlstra Awaiting requested review from JelleZijlstra JelleZijlstra is a code owner

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