[Python] reportAssignmentType Pylance error when using TypeVar

I'm trying to make a function that replaces some substrings inside strings with a preassigned value,
and I've extended it so that it works for list, dict, and tuple as well.

I used TypeVar to denote that the input type and output types are the same, but I keep getting pylance warning messages.

How should I type hint the following code so I don't get these messages?

T = TypeVar("T")
PLACEHOLDERS = ["1", "2", "3"]
VALUE = "value"

def replace_string(obj: T) -> T:
if isinstance(obj, str):
for placeholder in PLACEHOLDERS:
# Cannot access attribute "replace" for class "object*"
# Attribute "replace" is unknown, Type "str | Unknown" is not assignable to declared type "T@replace_string"
obj = obj.replace(placeholder, VALUE)
elif isinstance(obj, list):
# Type "list[Unknown]" is not assignable to declared type "T@replace_string"
obj = [replace_string(item) for item in obj]
elif isinstance(obj, tuple):
# Type "tuple[Unknown, ...]" is not assignable to declared type "T@replace_string"
obj = tuple(replace_string(item) for item in obj)
elif isinstance(obj, dict):
# Type "dict[Unknown, Unknown]" is not assignable to declared type "T@replace_string"
obj = {key: replace_string(value) for key, value in obj.items()}
return obj

Continue reading...