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
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
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
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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 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.
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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 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,
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
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
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
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
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
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
>>
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
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.
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:/
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
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, 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 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
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 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
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
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
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
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