On Jun 23, 2019, at 17:01, Steven D'Aprano
On Sun, Jun 23, 2019 at 03:22:37PM -0400, James Lu wrote: Make $ a valid identifier and a singleton.
$ is a useful placeholder in [].
Possible function partial syntax:
def foo(x, y): print(x, y)
partialized = foo[$, 10]
I don't think that creating partial functions is important enough to:
1. make partial functions a built-in language feature; 2. using syntax (square brackets); 3. and require a new built-in singleton.
I think that functools.partial is missing two features:
- the ability to close over positional parameters from the right, rather than the left;
- the ability to skip parameters.
The first could be solved with a "rpartial" function, and the second by using ellipsis ... as a placeholder, or a named constant in the functools module.
I’m pretty sure there are multiple improved-partial projects on PyPI. Maybe just picking out one and adding a link to it from the functools docs is sufficient?