(🐞) Heterogeneous `Enum`'s `.value` is `Any` & Union of homogeneous `Enum`s `.value` is `Any`
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bug
topic-enum
- Dominant language
- Python
- Stars
- 20.6k
- Forks
- 3.3k
- PR merge metrics
- PR metrics pending
Description
from enum import Enum
class Homo1(Enum):
A = 1
B = 2
class Homo2(Enum):
A = 1
B = 2
class Hetero(Enum):
A = 1
B = ""
homo: Homo1
reveal_type(homo.value) # 1 | 2
hetero: Hetero
reveal_type(hetero.value) # Any
homo_union: Homo1 | Homo2
reveal_type(homo_union.value) # Any
- possibly related #14092
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the provided Enum examples and tracing mypy's inference for heterogeneous Enum values and unions of homogeneous Enums. Determine the intended non-Any revealed types and add focused regression coverage; done means these cases no longer reveal Any.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- devtools
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100