The name `this` is problematic as it has a well established, different
meaning
in lots of other languages. It's basically `self` for languages that assign
to it
automatically. Full stack Python users will have `this` meaning two
different
things at each end, and they cannot alias it in either of them.
I'm not sure on the feature, but thought `let` was a perfect name for it.
-- Carl Smith
carl.input@gmail.com
On 23 May 2018 at 19:48, Kirill Balunov
2018-05-23 17:54 GMT+03:00 Mike Miller
: On 2018-05-22 14:32, Kirill Balunov wrote:
# in global scope everything works ok since locals is globals >>> while len( this( val = dummy() ) ) >= 0: ... print(val) [0, 1] [0, 1, 2] [0, 1, 2, 3]
Interesting! Although the example with a len() and mutable default arguments obscured the utility, I thought. Also, why limit it to one assignment?
I just want some dummy example which can not be trivially handled with `for name in iter(func, value)`. But the latter is also only partly true. You can make something like:
class P: __slots__ = ('func') def __init__(self, func): self.func = func def __eq__(self, other): return not self.func(other)
for val in iter(dummy, P(lambda x: len(x) < 5)): print(val)
[0, 1] [0, 1, 2] [0, 1, 2, 3]
The only restriction is that you can not pass arguments to a `func`, but this, to some extent, can also be handled with lambda. I limit it to _one assignment_ firstly to make it simple, and secondly to get rid of some edge cases.
Liked Terry's suggestions for name. The name that jumped into my brain as I read was a reuse of the locals() or globals() callable with key words, that would change their behavior to what you suggest.
I like `this` because it is easy to follow in my opinion: " While this name assigned to an expression is greater than zero do... " But of course I'm open to any other spelling. I'm just wondering, if someone like this form as an alternative for assignment expression (`:=`).
With kind regards, -gdg
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