Hi,
Python newbie here. I need help with the following two tasks I need to
accomplish using Python:
Creating a matrix of rolling variances
I have a pandas data frame of six columns, I would like to iteratively compute
the variance along each column. Since I am a newbi
Nico Schlömer writes:
> From what I understand about the Python profilers, the type of information
> you get from a stats object is
>
> * How much time was spent in function X,
> * what the callers and callees of function X are, and
> * and bunch of meta info about function X.
>
> With the
On Fri, May 25, 2018 at 1:15 PM, bartc wrote:
> On 25/05/2018 05:34, Mikhail V wrote:
>
> I had one big problem with your proposal, which is that I couldn't make head
> or tail of your syntax. Such a thing should be immediately obvious.
>
> (In your first two examples, what IS the exact string th
On Sat, May 26, 2018 at 3:07 PM, Ian Kelly wrote:
> On Fri, May 25, 2018 at 11:00 PM, Chris Angelico wrote:
>> On Sat, May 26, 2018 at 2:46 PM, Steven D'Aprano
>> wrote:
>>> Am I silly for wanting to make a single enum?
>>>
>>> I have a three-state flag, True, False or Maybe. Is is confusing or
On Fri, May 25, 2018 at 11:00 PM, Chris Angelico wrote:
> On Sat, May 26, 2018 at 2:46 PM, Steven D'Aprano
> wrote:
>> Am I silly for wanting to make a single enum?
>>
>> I have a three-state flag, True, False or Maybe. Is is confusing or bad
>> practice to make a single enum for the Maybe case?
On Sat, May 26, 2018 at 2:46 PM, Steven D'Aprano
wrote:
> Am I silly for wanting to make a single enum?
>
> I have a three-state flag, True, False or Maybe. Is is confusing or bad
> practice to make a single enum for the Maybe case?
>
>
> from enum import Enum
> class State(Enum):
> Maybe = 2
Am I silly for wanting to make a single enum?
I have a three-state flag, True, False or Maybe. Is is confusing or bad
practice to make a single enum for the Maybe case?
from enum import Enum
class State(Enum):
Maybe = 2
Maybe = State.Maybe
del State
Is there a better way of handling a
bartc wrote:
/The/ matrix multiplication operator?
In which language? And what was wrong with "*"?
It seems you're unaware that Python *already* has an '@'
operator. It was added specifically so that numpy could
use it for matrix multiplication. A new operator was
needed because numpy already
Dennis Lee Bieber wrote:
@ requires use of the weaker/shorter "ring finger" on (for me) the
weaker left hand.
But... choosing an operator on that basis would be
discriminating against left-handed people!
--
Greg
--
https://mail.python.org/mailman/listinfo/python-list
On Fri, 25 May 2018 09:58:19 -0700, Rob Gaddi wrote:
[...]
>> This is a frequent, recurring pain point. Experienced programmers
>> forget how confusing the behaviour of * is because they're so used to
>> the execution model. They forget that writing a list comp is not even
>> close to obvious, not
On 2018-05-25 23:24, Cameron Simpson wrote:
[snip]
You can reduce that list by generating the "wordlist" form from something
smaller:
base_phrases = ["Kilauea volcano", "government of Mexico", "Hawaii"]
wordlist = [
(base_phrase, " ".join([word + "/TAG" for word in base_phrase.split
Cameron Simpson writes:
> On 25May2018 04:23, Subhabrata Banerjee wrote:
> >On Friday, May 25, 2018 at 3:59:57 AM UTC+5:30, Cameron Simpson wrote:
> >> If you want to solve this problem with a programme you must first
> >> clearly define what makes an unwanted tag "unwanted". [...]
> >
> >By unw
On Thu, May 24, 2018 at 7:12 PM, wrote:
> here is the code, i keep getting an error, "break outside loop". if it is
> false just exit function
>
>
> def d(idx):
> if type(idx) != int:
> break
>
> d('k')
Not what you asked, but I believe pylint recommends using not isinstance
instead
On Fri, May 25, 2018 at 6:04 AM, Paul St George wrote:
> I am using the Python Imaging Library (PIL), Python 2 and Raspberry Pi 3 B+
>
> My code is simply:
>
> from PIL import Image
>
> im = Image.open(‘somepic.jpg’)
> im.show() # display image
>
>
> But the show() method looks for the
On Fri, 25 May 2018 13:05:01 -0400, Dennis Lee Bieber wrote:
> Let me play devil's advocate... and propose a simple change, with
no
> new operators...
>
> sl = [] * n #current behavior
> dl = n * [] #deep copy behavior
n*[] is already supported. You will suddenly chang
On Sat, 26 May 2018 02:58:06 +1000, Chris Angelico wrote:
> Your mail/news client might choose to represent configure.ac as a link,
> since ".ac" is a valid TLD.
Isn't *everything* a valid TLD now?
For the right price, at least.
--
Steve
--
https://mail.python.org/mailman/listinfo/python-l
On 25May2018 04:23, Subhabrata Banerjee wrote:
On Friday, May 25, 2018 at 3:59:57 AM UTC+5:30, Cameron Simpson wrote:
On 24May2018 03:13, wrote:
>I have a text as,
>
>"Hawaii volcano generates toxic gas plume called laze PAHOA: The eruption of Kilauea volcano in Hawaii sparked
new safety warni
On 2018-05-25 18:05, Dennis Lee Bieber wrote:
On Fri, 25 May 2018 15:40:41 + (UTC), Steven D'Aprano
declaimed the following:
On Fri, 25 May 2018 22:46:37 +1000, Chris Angelico wrote:
We've already had a suggestion for [[]]@5 and that should deal with that
issue. Steven is proposing "mult
On 05/25/2018 10:13 AM, bartc wrote:
On 25/05/2018 17:58, Rob Gaddi wrote:
So, in the spirit of explicit being better than implicit, please
assume that for actual implementation replicate would be a static
method of actual list, rather than the conveniently executable hackjob
below.
_list =
On 25/05/2018 17:58, Rob Gaddi wrote:
So, in the spirit of explicit being better than implicit, please assume
that for actual implementation replicate would be a static method of
actual list, rather than the conveniently executable hackjob below.
_list = list
_nodefault = object()
class list
On 05/25/2018 04:53 AM, Steven D'Aprano wrote:
On Fri, 25 May 2018 09:28:01 +0200, Peter Otten wrote:
Yet another arcanum to learn for beginners with little return. If you
cannot refrain from tinkering with the language at least concentrate on
the features with broad application. Thank you.
B
On Sat, May 26, 2018 at 2:43 AM, bartc wrote:
> On 25/05/2018 17:11, Alexandre Brault wrote:
>>
>>
>>
>> On 2018-05-25 11:40 AM, bartc wrote:
>>>
>>> On 25/05/2018 16:27, Chris Angelico wrote:
You're way WAY too late to debate the matrix multiplication operator.
>>>
>>>
>>> /The/ matrix
On Fri, 25 May 2018 17:12:12 +0100, bartc wrote:
> On 25/05/2018 16:40, Steven D'Aprano wrote:
[...]
>> On the other hand, it is arguable that what we really need is a
>> standard function to return an N-dimensional array/list:
>>
>> # return a 3x4x5x6 4-D list initialised to all zeroes arr =
>>
On 25/05/2018 17:11, Alexandre Brault wrote:
On 2018-05-25 11:40 AM, bartc wrote:
On 25/05/2018 16:27, Chris Angelico wrote:
You're way WAY too late to debate the matrix multiplication operator.
/The/ matrix multiplication operator?
In which language? And what was wrong with "*"?
In Pyth
On Fri, 25 May 2018 11:59:38 -0400, Dennis Lee Bieber wrote:
> What is your definition of a multi-dimensional array -- I tend to
think
> of them as pre-declared sizes; not the variable (row|column) lengths
> possible when using nested lists.
Any fixed size array can be implemented using a
On Tue, 22 May 2018 08:01:05 +0200, Christian Gollwitzer wrote:
>>> If a block of static data is large enough to start to be ugly, a
>>> common approach is to load the data from some other file, in a
>>> language which is designed around structured data.
[...]
> Thing is, you can do it already no
On 2018-05-25 11:40 AM, bartc wrote:
> On 25/05/2018 16:27, Chris Angelico wrote:
>> You're way WAY too late to debate the matrix multiplication operator.
>
> /The/ matrix multiplication operator?
>
> In which language? And what was wrong with "*"?
>
In Python, the language we're discussing right
On 25/05/2018 16:40, Steven D'Aprano wrote:
On Fri, 25 May 2018 22:46:37 +1000, Chris Angelico wrote:
We've already had a suggestion for [[]]@5 and that should deal with that
issue. Steven is proposing "multiply by copying" as an alternative to
"multiply by referencing", so an alternative multi
On Sat, May 26, 2018 at 1:40 AM, bartc wrote:
> On 25/05/2018 16:27, Chris Angelico wrote:
>>
>> On Fri, May 25, 2018 at 10:58 PM, bartc wrote:
>>>
>>> I'm in general not in favour of piling in special symbols into a language
>>> just to solve some obscure or rare problem.
>>>
>>> As I went on to
On Sat, May 26, 2018 at 1:46 AM, Steven D'Aprano
wrote:
> On Fri, 25 May 2018 18:06:00 +1000, Chris Angelico wrote:
>
>> Downside: while it's all very well to say that this is equivalent to
>> copy.deepcopy(), that would imply replicating copy.deepcopy's semantics
>> in the core list type (unless
I came across its usage in StackOverflow somewhere, but didn't see
it in the docs. I'm using 2.7.
I needed it while writing a class for generating text documents out of
HTML documents for attaching to emails, which lowers spam scores. I lifted
the basis for this from the top answer here: https
On Fri, 25 May 2018 18:06:00 +1000, Chris Angelico wrote:
> Downside: while it's all very well to say that this is equivalent to
> copy.deepcopy(), that would imply replicating copy.deepcopy's semantics
> in the core list type (unless it's actually literally defined as
> importing a module and cal
On Fri, 25 May 2018 18:06:00 +1000, Chris Angelico wrote:
> Downside: while it's all very well to say that this is equivalent to
> copy.deepcopy(), that would imply replicating copy.deepcopy's semantics
> in the core list type (unless it's actually literally defined as
> importing a module and cal
On 25/05/2018 16:27, Chris Angelico wrote:
On Fri, May 25, 2018 at 10:58 PM, bartc wrote:
I'm in general not in favour of piling in special symbols into a language
just to solve some obscure or rare problem.
As I went on to demonstrate, function-like syntax (or even actual functions)
could do
On Fri, 25 May 2018 22:46:37 +1000, Chris Angelico wrote:
> We've already had a suggestion for [[]]@5 and that should deal with that
> issue. Steven is proposing "multiply by copying" as an alternative to
> "multiply by referencing", so an alternative multiplication operator
> should fit that corr
On Fri, 25 May 2018 13:58:03 +0100, bartc wrote:
> As for '@', if a variable name can come before it /and/ after it, and
> either or both can be dotted, wouldn't that cause it to be highlighted
> as an email address in many circumstances? Such as in code posted here.
Sure.
And x/y might be forma
On Fri, May 25, 2018 at 10:58 PM, bartc wrote:
> I'm in general not in favour of piling in special symbols into a language
> just to solve some obscure or rare problem.
>
> As I went on to demonstrate, function-like syntax (or even actual functions)
> could do that job better, by describing what t
On 5/25/18 9:52 AM, brucegoodst...@gmail.com wrote:
On Friday, May 25, 2018 at 8:06:31 AM UTC-4, Ned Batchelder wrote:
On 5/24/18 6:54 PM, bruceg113...@gmail.com wrote:
I am trying to convert a string to a variable.
I got cases 1 & 2 to work, but not cases 3 & 4.
The print statement in cases
On Friday, May 25, 2018 at 8:06:31 AM UTC-4, Ned Batchelder wrote:
> On 5/24/18 6:54 PM, bruceg113...@gmail.com wrote:
> > I am trying to convert a string to a variable.
> >
> > I got cases 1 & 2 to work, but not cases 3 & 4.
> >
> > The print statement in cases 3 & 4 reports the following:
> >
On Friday, May 25, 2018 at 1:56:14 AM UTC-4, dieter wrote:
> bruceg113...@gmail.com writes:
>
> > I am trying to convert a string to a variable.
> >
> > I got cases 1 & 2 to work, but not cases 3 & 4.
> >
> > The print statement in cases 3 & 4 reports the following:
> > builtins.AttributeError
At EuroPython, we let our attendees have a significant say in the
selection of the sessions which are presented at the conference. We
call this “talk voting” - attendees can tell us which submitted talks
they’d like to see at the conference.
To be eligible to vote for talks, you need to be a submi
On 25/05/2018 13:46, Chris Angelico wrote:
On Fri, May 25, 2018 at 10:36 PM, bartc wrote:
On 24/05/2018 19:17, Steven D'Aprano wrote:
But what do people think about proposing a new list replication with copy
operator?
[[]]**5
would return a new list consisting of five shallow copies o
On Fri, May 25, 2018 at 10:36 PM, bartc wrote:
> On 24/05/2018 19:17, Steven D'Aprano wrote:
>
>> But what do people think about proposing a new list replication with copy
>> operator?
>>
>> [[]]**5
>>
>> would return a new list consisting of five shallow copies of the inner
>> list.
>>
>> Th
On 25/05/2018 13:36, bartc wrote:
Of course you have to implement dupllist(), but you'd have to implement
** too, and that is harder. For this specific example, it can just be:
def dupllist(x,n):
return [x[0].copy() for _ in range(n)]
On 25/05/2018 03:25, Steven D'Aprano wrote:
> You m
On 24/05/2018 19:17, Steven D'Aprano wrote:
But what do people think about proposing a new list replication with copy
operator?
[[]]**5
would return a new list consisting of five shallow copies of the inner
list.
Thoughts?
Choice of ** doesn't seem right for a start, as it suggests it
Hi everyone,
>From what I understand about the Python profilers, the type of information
you get from a stats object is
* How much time was spent in function X,
* what the callers and callees of function X are, and
* and bunch of meta info about function X.
With the program
```
def prime(n
On 5/24/18 6:54 PM, bruceg113...@gmail.com wrote:
I am trying to convert a string to a variable.
I got cases 1 & 2 to work, but not cases 3 & 4.
The print statement in cases 3 & 4 reports the following:
builtins.AttributeError: type object 'animal' has no attribute 'tiger'
I am stuck
On 5/25/18 7:23 AM, subhabangal...@gmail.com wrote:
> On Friday, May 25, 2018 at 3:59:57 AM UTC+5:30, Cameron Simpson wrote:
>> First up, thank you for a well described problem! Remarks inline below.
>>
>> On 24May2018 03:13, wrote:
>>> I have a text as,
>>>
>>> "Hawaii volcano generates toxic gas
On Fri, 25 May 2018 09:28:01 +0200, Peter Otten wrote:
> Yet another arcanum to learn for beginners with little return. If you
> cannot refrain from tinkering with the language at least concentrate on
> the features with broad application. Thank you.
Broader than multi-dimensional arrays? There a
On Fri, 25 May 2018 11:48:49 +0100, Ben Bacarisse wrote:
> Another way of looking at it would be in terms of evaluation rather than
> copying. [] evaluates to a new list object, so if there were an
> alternate version of L * n (for the sake of argument L ** n) that
> evaluated the list expression
I am using the Python Imaging Library (PIL), Python 2 and Raspberry Pi 3 B+
My code is simply:
from PIL import Image
im = Image.open(‘somepic.jpg’)
im.show() # display image
But the show() method looks for the default viewer (probably xv). How do
I change this (in the code, or in
On Friday, May 25, 2018 at 3:59:57 AM UTC+5:30, Cameron Simpson wrote:
> First up, thank you for a well described problem! Remarks inline below.
>
> On 24May2018 03:13, wrote:
> >I have a text as,
> >
> >"Hawaii volcano generates toxic gas plume called laze PAHOA: The eruption of
> >Kilauea volca
Steven D'Aprano writes:
> On Thu, 24 May 2018 16:05:32 -0700, Paul wrote:
>
>> How would one make a multi-dimensional list now, with truly-separate sub
>> lists? Is there just no way to do it with the replication operator?
>
> Correct. Let's say you want to make a 1-D list with three items
> in
On 25/05/2018 11:08, asa32s...@gmail.com wrote:
On Thursday, May 24, 2018 at 10:12:46 PM UTC-4, asa3...@gmail.com wrote:
here is the code, i keep getting an error, "break outside loop". if it is false
just exit function
def d(idx):
if type(idx) != int:
break
d('k')
thanks...
On 25/05/2018 05:34, Mikhail V wrote:
Proposal
---
Current proposal suggests adding syntax for the "raw text" statement.
This should enable the possibility to define text pieces in source
code without the need for interpreted characters.
Thereby it should solve the mentioned issues.
Add
On Thursday, May 24, 2018 at 10:12:46 PM UTC-4, asa3...@gmail.com wrote:
> here is the code, i keep getting an error, "break outside loop". if it is
> false just exit function
>
>
> def d(idx):
> if type(idx) != int:
> break
>
> d('k')
thanks... I believe the compiler. So how do I
25.05.18 10:28, Peter Otten пише:
Steven D'Aprano wrote:
But what do people think about proposing a new list replication with copy
operator?
[[]]**5
would return a new list consisting of five shallow copies of the inner
list.
Yet another arcanum to learn for beginners with little retur
On Fri, May 25, 2018 at 5:50 PM, Stefan Behnel wrote:
> Peter Otten schrieb am 25.05.2018 um 09:28:
>> Steven D'Aprano wrote:
>>
>>> But what do people think about proposing a new list replication with copy
>>> operator?
>>>
>>> [[]]**5
>>>
>>> would return a new list consisting of five shallo
Peter Otten schrieb am 25.05.2018 um 09:28:
> Steven D'Aprano wrote:
>
>> But what do people think about proposing a new list replication with copy
>> operator?
>>
>> [[]]**5
>>
>> would return a new list consisting of five shallow copies of the inner
>> list.
>
> Yet another arcanum to learn
Steven D'Aprano wrote:
> But what do people think about proposing a new list replication with copy
> operator?
>
> [[]]**5
>
> would return a new list consisting of five shallow copies of the inner
> list.
Yet another arcanum to learn for beginners with little return.
If you cannot refrain
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