Enum values that differ in case get conflated

[krzysztofwos]

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Example Code

from enum import Enum

import typer


class Interval(Enum):
    ONE_MINUTE = "1m"
    ONE_MONTH = "1M"


def main(interval: Interval = typer.Argument("1m", case_sensitive=True)):
    print(interval)


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

Description

The example illustrates the problem: enum values that differ in case get conflated. In the example above, running the script with 1m and 1M results in the main function receiving Interval.ONE_MONTH. The issue starts in the function below, lifted from main.py:

def generate_enum_convertor(enum: Type[Enum]) -> Callable[[Any], Any]:
    lower_val_map = {str(val.value).lower(): val for val in enum}

    def convertor(value: Any) -> Any:
        if value is not None:
            low = str(value).lower()
            if low in lower_val_map:
                key = lower_val_map[low]
                return enum(key)

    return convertor

Operating System

Linux

Operating System Details

No response

Typer Version

0.7.0

Python Version

3.10.6

Additional Context

No response

[avaldebe]

This is a bug 🐞, IMO. I submitted a PR to fix it #571. Hope it gets merged...

[tiangolo]

Indeed, this was a bug, thanks @avaldebe for the fix! It will be available in Typer 0.9.1 in the next few hours.