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Sentinel available in context during option callbacks #3136
Description
Sentinel is an implementation detail that is not intentionally exposed. However, it is in the context params during a callback: sentinel_in_callback.py
import click
def _validate(ctx, param, value):
you_sentinel = ctx.params.get("you")
you_too_sentinel = ctx.params.get("you_too")
print(f"you: {you_sentinel}")
print(f"you_too: {you_too_sentinel}")
print(f"param: {param}")
print(f"value: {value}")
return value
@click.group()
def basic():
pass
@basic.command()
@click.argument('you', required=False)
@click.option('--you-too', )
@click.option('--yall', callback=_validate)
@click.pass_context
def hello(ctx, you, you_too, yall):
click.echo('Hello World!')
if __name__ == '__main__':
basic()
# python -m sentinel_in_callback hello
> python -m sentinel_in_callback hello
you: Sentinel.UNSET
you_too: Sentinel.UNSET
param: <Option yall>
value: None
Hello World!
Activity
Rowlando13 commentedon Nov 10, 2025
Minimal reproduction of pallets/flask#5836.
Rowlando13 commentedon Nov 11, 2025
@kdeldycke Can you take a look at this when you get a chance. It is holding up 8.3.1.
kdeldycke commentedon Nov 11, 2025
Oh sorry I did not realized that. Was lost in a couple of rabbit holes. I could also benefits from a 8.3.1 release! 😅 Ok let me look into this...
kdeldycke commentedon Nov 11, 2025
Oh f***. You're not gonna like this. This is a side-effect of:
UNSETnormalization #3079default=Trueon feature flags is order-sensitive #3071Looking for a way to reconcile the two.
kdeldycke commentedon Nov 11, 2025
I have a fix available at #3137 that is ready for review.