Document that inspect.isclass returns False for GenericAlias instances #132467
Description
Bug report
Bug description:
Hi
I am not sure if this is a bug, but I use the bug template because I couldn't find a better one to submit questions like this one.
The documentation says, "User-defined generic classes can be instantiated.".
import inspect
from typing import TypeVar, Generic
T = TypeVar("T")
class Node(Generic[T]):
x: T # Instance attribute (see below)
def __init__(self, label: T | None = None) -> None:
self.label = label
x = Node("") # Inferred type is Node[str]
y = Node(0) # Inferred type is Node[int]
z = Node() # Inferred type is Node[Any]
# Also OK:
y = Node[int](0)
print(inspect.isclass(Node)) # True
print(inspect.isclass(Node[int])) # False (shouldn't this be True?)
print(inspect.isclass(Node[str])) # False (shouldn't this be True?)In the example above, shouldn't calls such as inspect.isclass(Node[int]) return True, since they can be instantiated and used like normal classes?
CPython versions tested on:
3.13
Operating systems tested on:
Linux
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