Chris Angelico :
> Yes, that's correct. The *descriptor* protocol is what allows
> "foo.bar" to cause a function to be executed
That mechanism allows you to expose data fields in the API. If the
implementation later changes, you can emulate the data fields.
I must say, though, I have yet to run
Am 01.10.17 um 23:27 schrieb Daniel Bastos:
def make_sequence_non_recursive(N, x0 = 2, c = -1):
"What's wrong with this function? It's very slow."
last = x0
def sequence():
nonlocal last
next = last
last = last**2 + c
return next % N
return sequence
It crawls pre
On Mon, 2 Oct 2017 12:00 pm, Ben Bacarisse wrote:
>> Better:
>>
>> last = (pow(last, 2, N) + (2 % N)) % N
>
> You meant c rather than 2, I think.
Oops, yes, that was a typo.
> And I'm not convinced all the %Ns
> are worth while.
They are all necessary.
py> (2**75 + 7) % 12 # Expected val
On Sunday, October 1, 2017 at 6:47:34 PM UTC+1, MRAB wrote:
> On 2017-10-01 02:52, Stefan Ram wrote:
> > MRAB writes:
> >>raise ValueError("Temperature below -273 is not possible")
> >
> >-273.15
> >
> I think you've trimmed a little too much. In my reply I was only copying
> what someone el
Steve D'Aprano writes:
> On Mon, 2 Oct 2017 09:49 am, Ben Bacarisse wrote:
>
>> Daniel Bastos writes:
>>
>>> def make_sequence_non_recursive(N, x0 = 2, c = -1):
>>> "What's wrong with this function? It's very slow."
>>> last = x0
>>> def sequence():
>>> nonlocal last
>>> next = l
On Mon, Oct 2, 2017 at 11:34 AM, Steve D'Aprano
wrote:
>> change it to
>>
>> last = (last**2 + c) % N
>> return next
>
> Better:
>
> last = (pow(last, 2, N) + (2 % N)) % N
>
> will almost certainly be faster for large values of last.
I think possibly you mean (c % N) in the middle the
On Mon, 2 Oct 2017 09:49 am, Ben Bacarisse wrote:
> Daniel Bastos writes:
>
>> def make_sequence_non_recursive(N, x0 = 2, c = -1):
>> "What's wrong with this function? It's very slow."
>> last = x0
>> def sequence():
>> nonlocal last
>> next = last
>> last = last**2 + c
>>
On Mon, Oct 2, 2017 at 9:22 AM, Daniel Bastos wrote:
> Chris Angelico writes:
>
>> For a start, it should probably be implemented as a generator.
>
> Maybe something like this?
>
> def make_generator(N, last = 2, c = -1):
> while True:
> yield last
> last = (last**2 + c) % N
Yeah, that
On Mon, Oct 2, 2017 at 9:47 AM, Bill wrote:
> Stephan Houben wrote:
>>
>> Op 2017-10-01, Bill schreef :
>>>
>>> I watched an example on YouTube where someone wrote a simple descriptor
>>> ("@Time_it) to output the amount of time that it took ordinary functions
>>> to complete.To be honest, I A
Steve D'Aprano wrote:
The definitive explanation of descriptors is here:
https://docs.python.org/3/howto/descriptor.html
Thank you! It is next on my list. Then I'll try that Circle problem
you mentioned as an exercise last night! I don't expect run into any
difficulties. : )
--
https:/
Daniel Bastos writes:
> def make_sequence_non_recursive(N, x0 = 2, c = -1):
> "What's wrong with this function? It's very slow."
> last = x0
> def sequence():
> nonlocal last
> next = last
> last = last**2 + c
> return next % N
> return sequence
>
> It crawls pretty soon.
Stephan Houben wrote:
Op 2017-10-01, Bill schreef :
I watched an example on YouTube where someone wrote a simple descriptor
("@Time_it) to output the amount of time that it took ordinary functions
to complete.To be honest, I AM interested in descriptors.
Are you sure you are not confusing d
Chris Angelico writes:
> On Mon, Oct 2, 2017 at 8:27 AM, Daniel Bastos wrote:
>> def make_sequence_non_recursive(N, x0 = 2, c = -1):
>> "What's wrong with this function? It's very slow."
>> last = x0
>> def sequence():
>> nonlocal last
>> next = last
>> last = last**2 + c
>>
Steve D'Aprano wrote:
On Sun, 1 Oct 2017 05:46 pm, Bill wrote:
If you were going to show non-Python users, say science undergraduates
and faculty, that Python is an interesting tool (in 45 minutes), would
one delve into descriptors?
Hell no :-)
Oops, I see I used the word "descriptor", where I
On Mon, Oct 2, 2017 at 8:27 AM, Daniel Bastos wrote:
> def make_sequence_non_recursive(N, x0 = 2, c = -1):
> "What's wrong with this function? It's very slow."
> last = x0
> def sequence():
> nonlocal last
> next = last
> last = last**2 + c
> return next % N
> return seque
def make_sequence_non_recursive(N, x0 = 2, c = -1):
"What's wrong with this function? It's very slow."
last = x0
def sequence():
nonlocal last
next = last
last = last**2 + c
return next % N
return sequence
It crawls pretty soon. Please advise? Thank you.
>>> f = make_se
Op 2017-10-01, Bill schreef :
> Steve D'Aprano wrote:
>>
>> [1] Technically, the interpreter knows nothing about properties. What
>> it cares about is *descriptors*. Properties are just one kind of
>> descriptor, as are methods. But I'm intentionally not talking about
>> the gory details of descrip
Op 2017-10-01, Bill schreef :
> I watched an example on YouTube where someone wrote a simple descriptor
> ("@Time_it) to output the amount of time that it took ordinary functions
> to complete.To be honest, I AM interested in descriptors.
Are you sure you are not confusing deSCRIPTtors and
On 2017-10-01 18:20, Ulrich Goebel wrote:
Hallo,
ich lese mit Python aus einer PostgreSQL-Datenbank strings (SQL-Typ:
text), die über LibreOffice dort hinein geschrieben werden. Diese
Strings können Zeilenschaltungen enthalten, von denen ich aber nicht
weiß, wie sie kodiert sind: vielleicht \n,
On 01/10/17 19:20, Ulrich Goebel wrote:
> Hallo,
>
> ich lese mit Python aus einer PostgreSQL-Datenbank strings (SQL-Typ:
> text), die über LibreOffice dort hinein geschrieben werden. Diese
> Strings können Zeilenschaltungen enthalten, von denen ich aber nicht
> weiß, wie sie kodiert sind: vielleic
On 2017-10-01 02:52, Stefan Ram wrote:
MRAB writes:
raise ValueError("Temperature below -273 is not possible")
-273.15
I think you've trimmed a little too much. In my reply I was only copying
what someone else had written.
--
https://mail.python.org/mailman/listinfo/python-list
Hallo,
ich lese mit Python aus einer PostgreSQL-Datenbank strings (SQL-Typ:
text), die über LibreOffice dort hinein geschrieben werden. Diese
Strings können Zeilenschaltungen enthalten, von denen ich aber nicht
weiß, wie sie kodiert sind: vielleicht \n, \r, \n\r, \r\n oder sonstwie.
Um das h
On 01/10/17 03:52, Stefan Ram wrote:
> MRAB writes:
>> raise ValueError("Temperature below -273 is not possible")
> -273.15
>
Either way, that depends.
https://en.wikipedia.org/wiki/Negative_temperature#Examples
--
https://mail.python.org/mailman/listinfo/python-list
On Sun, 1 Oct 2017 05:46 pm, Bill wrote:
> If you were going to show non-Python users, say science undergraduates
> and faculty, that Python is an interesting tool (in 45 minutes), would
> one delve into descriptors?
Hell no :-)
I think there's a hierarchy of difficulty/complexity/mind-boggling
Steve D'Aprano wrote:
[1] Technically, the interpreter knows nothing about properties. What it cares
about is *descriptors*. Properties are just one kind of descriptor, as are
methods. But I'm intentionally not talking about the gory details of
descriptors. Feel free to ask if you care, but hone
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