On Fri, Feb 12, 2021 at 1:01 AM Henry Harutyunyan
<henryharutyun...@gmail.com> wrote:
> this is fine as long as you need to use that filter for once. But if you want
> to reuse it you either need to create the iterator every time specifying the
> filter function, or save the function in a var and create the filter with
> that.
>
> I'm wondering why can't we create custom filters and mappers that are
> reusable. The result will look something like this:
>
> ```
> >>> pass_filter = filter(lambda x: x > 60)
> >>> foo = [42, 56, 67, 87]
> >>> for i in pass_filter(foo):
> >>> print(i)
> 67
> 86
> >>> bar = {45, 94, 65, 3}
> >>> for i in pass_filter(bar):
> >>> print(i)
> 65
> 94
> ```
> Are there any drawbacks or limitations to this? Is is worth working on?
Why not simply define your function and give it a name?
def above_sixty(x): return x > 60
That'd give you most of the same benefits.
Making filter/map do something completely different if you omit an
argument is a bug magnet.
ChrisA
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