String partition complains about something strange

[Evgeniy Krysanov (catcombo)]

I'm trying to split string into three parts by using the following code:

id, _, name = "id:name".partition(":")

pyright complains:

Type "LiteralString" is not assignable to declared type "dict[Unknown, Unknown]"
  "str" is not assignable to "dict[Unknown, Unknown]" (Pyright reportAssignmentType)

What dict? I have only new variables on the left side. There are no dicts, only tuple of the same size that str.partition returns.

[Brian Schubert (brianschubert)]

Presumably you previously assigned a dict to _ somewhere, e.g.

_: dict

# much later...
id, _, name = "id:name".partition(":")  # E: Type "LiteralString" is not assignable to declared type "dict[Unknown, Unknown]"

[Evgeniy Krysanov (catcombo)]

Omg, yes, you're right. I marked one of the function parameters as unused with underscore. Thanks!