Sibylle Koczian於 2019年10月20日星期日 UTC+8上午2時04分54秒寫道：
> Am 19.10.2019 um 13:11 schrieb jf...@ms4.hinet.net:
> > For the two examples below:
> > (1)
> class A:
> > ... def foo(self):
> > ... self.goo()
> > ...
> class B(A):
> > ... def goo(self):
> > ... print(1)
> > .
Hi Jach,
On 20/10/2019 09:34, jf...@ms4.hinet.net wrote:
What puzzles me is how a parent's method foo() can find its child's method
goo(), no matter it was overwrote or not? MRO won't explain this and I can't
find document about it also:-(
This is a generalised description - Python may be sl
On Sun, Oct 20, 2019 at 9:06 PM Ian Hobson wrote:
>
> Hi Jach,
>
> On 20/10/2019 09:34, jf...@ms4.hinet.net wrote:
> > What puzzles me is how a parent's method foo() can find its child's method
> > goo(), no matter it was overwrote or not? MRO won't explain this and I
> > can't find document abo
On 10/20/19 4:34 AM, jf...@ms4.hinet.net wrote:
> Yes, there will be an attribute error if no goo() was defined.
>
> What puzzles me is how a parent's method foo() can find its child's method
> goo(), no matter it was overwrote or not? MRO won't explain this and I can't
> find document about it
Hi Chris,
Yes, I am aware of the hash of small integers. But I am not keying
with small integers here: I am keying with id() values of class
instances.
Precisely what my example shows is that the dict/set algorithms in
fact *never* call __eq__, when the id() of a class instance is
returned by __
Steve White wrote:
> Hi Chris,
>
> Yes, I am aware of the hash of small integers. But I am not keying
> with small integers here: I am keying with id() values of class
> instances.
The id() values /are/ smallish integers though.
(I would guess that this is baked into the CPython source, but di
On 10/20/2019 04:16 AM, Anders Hovmöller wrote:
On 20 Oct 2019, at 12:41, Steve Jorgensen wrote:
Anders Hovmöller wrote:
We try to do the same thing in various libraries. We've settled on using
existing
python and end up with syntax like:
class MyForm(Form):
field = Field()
or in your
Hi Peter,
Yes you are right. In fact, I shouldn't even have mentioned the
hash() function... it came from a line of reasoning about what an
implementation might do if very large integers were returned by
__hash__(), and some remarks about the value returned by id() applied
to small integers.
The
Steve White wrote:
> Hi Peter,
>
> Yes you are right. In fact, I shouldn't even have mentioned the
> hash() function... it came from a line of reasoning about what an
> implementation might do if very large integers were returned by
> __hash__(), and some remarks about the value returned by id()
On Sun, Oct 20, 2019 at 7:57 PM Peter Otten <__pete...@web.de> wrote:
>
> Steve White wrote:
> >
> > The point is, I don't think __eq__() is ever called in a situation as
> > described in my post, yet the Python documentation states that if
> > instances are to be used as keys, it must not be used
On Mon, Oct 21, 2019 at 4:33 AM Steve White wrote:
> The options for following the documentation in this situation are:
> either subject users to unfamiliar, custom-made container classes, or
> give up the semantics of the "==" operator.
>
> It seems so unnecessary, given (my understanding of) how
Steve White wrote:
> On Sun, Oct 20, 2019 at 7:57 PM Peter Otten <__pete...@web.de> wrote:
>>
>> Steve White wrote:
>> >
>> > The point is, I don't think __eq__() is ever called in a situation as
>> > described in my post, yet the Python documentation states that if
>> > instances are to be used a
doganad...@gmail.com writes:
>
> In the meanwhile I have checked Scala , and it's more limited then Python.
> As an example:
> 0.0001
> 1.0E-4: Double
>
Why do you think this means Scala is more limited than Python?
--
Piet van Oostrum
WWW: http://piet.vanoostrum.org/
PGP key: [8DAE142BE17999C4]
-- Forwarded message -
From: Steve White
Date: Sun, Oct 20, 2019 at 11:38 PM
Subject: Re: keying by identity in dict and set
To: Peter Otten <__pete...@web.de>
Hi Peter,
Thanks, that does seem to indicate something.
(But there was no need to define a class... you're basically sa
I am delighted to announce the release 1.0.0 of Austin. If you haven't
heard of Austin before, it is a frame stack sampler for CPython. It can
be used to obtain statistical profiling data out of a running Python
application without a single line of instrumentation. This means that you
can start
my statement may seem unlogical while evaluating and comparing the languages as
a whole..
I thought when I give a small number into the programme , the more decimals I
can see after the dot as an output, the more human readable it is.
when I see a bunch of numbers with 'e' s I know the number
Ian Hobson於 2019年10月20日星期日 UTC+8下午6時05分11秒寫道：
> Hi Jach,
>
> On 20/10/2019 09:34, jf...@ms4.hinet.net wrote:
> > What puzzles me is how a parent's method foo() can find its child's method
> > goo(), no matter it was overwrote or not? MRO won't explain this and I
> > can't find document about it
On Sun, Oct 20, 2019 at 6:06 PM wrote:
>
>
> my statement may seem unlogical while evaluating and comparing the languages
> as a whole..
>
> I thought when I give a small number into the programme , the more decimals I
> can see after the dot as an output, the more human readable it is.
>
> when
Python's triple-quoted multiline string is a wonderful feature. It
vastly simplifies the writing of polyglot scripts (where the same file
contains multiple different languages of code in it), hiding any
non-Python code inside a triple quoted string. Had need of a
Makefile+Python setup today...
(No
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