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[channels] Make URLRouter.routes a Collection #15080

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[channels] Make URLRouter.routes a Collection #15080

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0d165cf
[channels] Make URLRouter.routes a Collection
cjwatson Nov 24, 2025
79675e2
[channels] Weaken a couple of other list parameter types
cjwatson Nov 25, 2025
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[channels] Make URLRouter.routes a Collection 
`list` is invariant, which made this type inconvenient in practice.
Each of the routes is either a pattern or another router.
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cjwatson committed Nov 25, 2025
commit 0d165cf053e2d640c71f73953fdb81de265478dd
5 changes: 3 additions & 2 deletions stubs/channels/channels/routing.pyi
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
from collections.abc import Collection
from typing import Any, type_check_only

from asgiref.typing import ASGIReceiveCallable, ASGISendCallable, Scope
Expand All @@ -19,9 +20,9 @@ class _ExtendedURLPattern(URLPattern):
callback: _ASGIApplicationProtocol | URLRouter

class URLRouter:
routes: list[_ExtendedURLPattern | URLRouter]
routes: Collection[_ExtendedURLPattern | URLRouter]

def __init__(self, routes: list[_ExtendedURLPattern | URLRouter]) -> None: ...
def __init__(self, routes: Collection[_ExtendedURLPattern | URLRouter]) -> None: ...
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@srittau srittau Nov 26, 2025

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The typeshed standard for for ... in loops is Iterable. In fact, Collection won't work:

from collections.abc import Container

x: Container[int] = []

for y in x:  # error: "Container[int]" has no attribute "__iter__" (not iterable)
    reveal_type(y)  # note: Revealed type is "Any"

async def __call__(self, scope: Scope, receive: ASGIReceiveCallable, send: ASGISendCallable) -> None: ...

class ChannelNameRouter:
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