On 10/04/11 20:45, Terry Reedy wrote:
On 10/4/2011 9:50 AM, Valiev Sergey wrote:
- `[]` - used for list comprehension,
- `()` - used for generators,
- `[start:stop]` / `[start:stop:step]` - used for slices.
The idea is to use `(start:stop)` / `(start:stop:step)` as 'lazy
evaluated' slices (like itertools.islice).
What do you think about it?
a(b) is already used for function calls. Making a(b:c) be something
unreleated does not seem like a good idea to me. At present, a[b:c] ==
a[slice(b,c)]. However, a(slice(b,c)) is already a function call and
could not equal a(b:c).
I'm very -1 on the initial proposal with parens, but I wouldn't
object to generators growing a method (__getitem__?) to do slices
via itertools, something like
gen = (a for a in iterator if test(a))
for thing in gen[4::2]:
do_something(thing)
acting something like
gen = (a for a in iterator if test(a))
for thing in itertools.islice(gen, start=4, step=2):
do_something(thing)
-tkc
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