class Opt(Enum) as default value is not handled correctly

[trim21]

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Example Code

from enum import Enum

import typer


class NeuralNetwork(Enum):
    simple = "simple"
    conv = "conv"
    lstm = "lstm"


def main(network: NeuralNetwork = NeuralNetwork.simple):
    print(f"Training neural network of type: {network.value}")


if __name__ == "__main__":
    typer.run(main)

Description

this result in to a error:

┌─ Error ─────────────────────────────────────────────────────────────────────┐
│ Invalid value for '--network': <NeuralNetwork.simple: 'simple'> is not one  │
│ of 'simple', 'conv', 'lstm'.                                                │
└─────────────────────────────────────────────────────────────────────────────┘

Operating System

Linux

Operating System Details

No response

Typer Version

0.11.1

Python Version

Python 3.11.6

Additional Context

No response

[AlessandroPomponio]

Hi @trim21 !
Try adding .value to your default and it should work:

def main(network: NeuralNetwork = NeuralNetwork.simple.value):

Note: I think this is required because the convert method that gets invoked expects a string to convert into your Enum type, so the default will need to be the related string value but in the code you'll get the Enum ^^

[trim21]

I think this is a issue becasue both class NeuralNetwork(enum.IntEnum), class NeuralNetwork(int, enum.Enum) class NeuralNetwork(enum.StrEnum) and class NeuralNetwork(str, enum.Enum) work with network: NeuralNetwork = NeuralNetwork.simple

[zack-mayoh]

This creates a new type issue. It results in this error from mypy:

Incompatible default for argument "network" (default has type "str", argument has type "NeuralNetwork")