Umm?!
items = (j for j in range(10) if j not in {2, 8})
We don't need a new keyword. Nor a tortured use of an old one.
On Mon, Jun 28, 2021, 8:46 PM Rob Cliffe via Python-ideas <
python-ideas@python.org> wrote:
> Another wild idea: Suppose that after a line that introduces a suite,
> including the final colon, you could write further lines on the same
> physical line, and this would be semantically equivalent to having them
> on separate lines with increasing indents, but a smaller indent than the
> following lines in the suite body. Example:
>
> with open('file1') as f: with open('file2') as g:
> <do stuff>
>
> Then you could write:
>
> for i in range(0, 10): if i not in range(2, 8):
> <do stuff>
> # This is arguably slightly easier to read than having two separate
> lines, as it puts both aspects of a single concept ("what values of i do
> I loop over?") together. It also avoids a physical indentation level.
>
> Rob Cliffe
>
> On 29/06/2021 00:44, Richard Damon wrote:
> > On 6/28/21 5:40 PM, Max Shouman wrote:
> >> This is more of a syntactic sugar than an actual new feature, but...
> >> Exactly, 'but' is the idea: a special keyword to be used in for
> statements to exclude values from the iterable.
> >>
> >> E.g., when iterating over a generator:
> >>>>> for i in range(0, 10) but (2, 8):
> >> would implicitly create a new generator comprehensively, as in:
> >>>>> for i in (j for j in range(0, 10) if j not in [2, 8]):
> >> It might not add such a feature to justify the definition of a but_stmt
> in python.gram, but it's fully compliant with Python's philosophy of
> concise, clear and elegant code.
> >>
> >> #road to a programming natural language (jk)
> > Wild idea, but could we avoid a new keyword by reusing one that can't go
> > there, like except?
> >
> >
> > for i in range(0,10) except (2, 8):
> >
> >
> > don't know if it is actually worth it, but at least it doesn't add a new
> > keyword.
> >
>
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