On 2020-04-30 1:07 p.m., Ethan Furman wrote:
On 04/30/2020 07:58 AM, Christopher Barker wrote:
On 04/29/2020 10:51 PM, Stephen J. Turnbull wrote:
I think that the issue of searchability and signature are pretty
compelling reasons for such a simple feature to be part of the
function name.
I would absolutely agree with that if all three function were in the
same namespace (like the string methods referred to earlier), but in
this case, one is a built in and the others will not be — which makes
a huge difference in discoverability.
Imagine someone that uses zip() in code that works for a while, and
then discovers a bug triggered by unequal length inputs.
If it’s a flag, they look at the zip docstring, and find the flag,
and their problem is solved.
So update the `zip` docstring with a reference to `zip_longest`,
`zip_equal`, and `zip_whatever`.
-1 on using a flag.
what about letting `zip` take a `leftover_func` with arguments
`partial_results` and `remaining_iterators`, and then provide
`zip_longest`, `zip_equal` and `zip_shortest` (default) as functions you
can use with it?
an iteration of `zip(a, b, c, leftover_func=foo)` would:
1. call next on the first iterator (internal iter(a))
2. if it fails, call leftover_func with the () tuple as first arg and
the (internal iter(b), internal iter(c)) tuple as second arg
3. call next on the second iterator (internal iter(b))
4. if it fails, call leftover_func with the (result from a,) tuple as
the first arg and the (internal iter(a), internal iter(c)) tuple as
second arg
5. call next on the third iterator (internal iter(c))
6. if it fails, call leftover_func with the (result from a, result from
b) tuple as the first arg and the (internal iter(a), internal iter(b))
tuple as second arg
7. yield the (result from a, result from b, result from c) tuple
the leftover_func should return an iterator that replaces the zip, or
None. (zip_shortest would be the no_op function)
--
~Ethan~
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