On Mon, Mar 28, 2016 at 1:59 PM, Tim Chase
wrote:
> On 2016-03-28 12:38, Chris Angelico wrote:
>> I would still look askance at code that adds two things and drops
>> the result, though. The compiler can't discard it, but if a linter
>> complains, I'd support that. A DSL that requires you to do th
On 2016-03-28 12:38, Chris Angelico wrote:
> I would still look askance at code that adds two things and drops
> the result, though. The compiler can't discard it, but if a linter
> complains, I'd support that. A DSL that requires you to do this is,
> imo, poorly designed.
Is it only the "*add* tw
On Mon, 28 Mar 2016 01:43 am, BartC wrote:
[... talk about function and procedures ...]
> Well, that could be done in Python (not so usefully because you can't
> take account of such info until a call is attempted), but that's not
> what I'm talking about, which is simply allowing:
>
>fn(...)
On Mon, Mar 28, 2016 at 12:24 PM, Steven D'Aprano wrote:
>>
>>f() # Probably OK
>>g() # Probably OK
>>f()+g() # Probably not OK
>
> You don't and can't know what's "probably not" okay unless you know what
> type of object both f and g return.
>
> Don't think about f
Steven D'Aprano writes:
> if condition:
> print(1)
> print(2)
> else:
> print(3)
> print(4)
> what value should it return? Justify your choice.
It could whatever value that the last call to print() returns. Lisp
has worked like that since the 1950's.
> What should be the return
On Mon, 28 Mar 2016 03:39 am, Terry Reedy wrote:
> On 3/27/2016 11:48 AM, Ned Batchelder wrote:
>> On Sunday, March 27, 2016 at 10:43:49 AM UTC-4, BartC wrote:
>
>>> whether fn has an explicit return or not, and not allowing:
>>>
>>> fn # and other kinds of expression
>>>
>>> unless s
On Mon, 28 Mar 2016 07:49 am, BartC wrote:
> On 27/03/2016 21:32, Tim Chase wrote:
>> On 2016-03-27 14:28, Steven D'Aprano wrote:
>
>>> In this case, the two lines "fnc" and "next" simply look up the
>>> function names, but without actually calling them. They're not
>>> quite "no-ops", since they
On Sun, 27 Mar 2016 10:31 pm, BartC wrote:
> On 27/03/2016 07:34, Paul Rubin wrote:
>> BartC writes:
>>> But my suggestion was to have required a keyword in front of
>>> such expressions.
>>
>> Should there be a keyword in front of a line containing "sqrt(x)" ?
>> What about "launch(missiles)"
On Mon, 28 Mar 2016 05:01 am, Marco S. wrote:
> Steven D'Aprano wrote:
>
>> The point you might have missed is that treating lists as if they were
>> mappings violates at least one critical property of mappings: that the
>> relationship between keys and values are stable.
>
>
> This is true for
On Mon, 28 Mar 2016 03:58 am, BartC wrote:
>> One of Guido's principles in designing Python was to keep it simple,
>> even where that might mean people could make errors with it. This part
>> of the language is no different: any expression can be a statement.
>
> Yeah, but even simpler would be
On Mon, 28 Mar 2016 01:18 am, Bob Gailer wrote:
> The problem with putting input at the end of a program is: if the program
> raises an exception you won't see it.
True. But the solution to that is simple: don't make mistakes when
programming :-)
If you have a better solution, please speak up. I
Richard Riehle writes:
> Several months ago, I posted a question regarding how to create a list
> of functions.
> I realize that this seems trivial to many experience Pythonistas. But
> it might prove useful for those who are relative newcomers to the
> language. In any case, I hope someone ca
On Sun, 27 Mar 2016 13:24:05 +, Hongyi Zhao wrote:
> # replace env
> os.environ.clear()
I find another method which can solve this issue, ie., changing the above
code into the follows:
# ref : http://unix.stackexchange.com/questions/178522/unsetting-
environment-variable-with-an-empty-name
On Sat, 26 Mar 2016 23:30:30 +, John Pote wrote:
> So I have sympathy with the OP, I would expect the compiler to pick this
> up
Why? The code is valid, the compiler knows how to generate the
appropriate bytecode for it.
The compiler isn't "lint".
Reporting code which is actually invalid is
Hi Richard,
On 27/03/16 20:38, Richard Riehle wrote:
I realize that this seems trivial to many experience Pythonistas. But it might
prove useful for those who are relative newcomers
Thanks for sharing your solution (people finding the original question
because it happens to match their own
On 27/03/2016 22:55, Ned Batchelder wrote:
On Sunday, March 27, 2016 at 4:19:12 PM UTC-4, BartC wrote:
On 27/03/2016 18:19, Ned Batchelder wrote:
On Sunday, March 27, 2016 at 12:58:23 PM UTC-4, BartC wrote:
There would be a list of expression terms that can also form independent
statements.
On Sunday, March 27, 2016 at 4:19:12 PM UTC-4, BartC wrote:
> On 27/03/2016 18:19, Ned Batchelder wrote:
> > On Sunday, March 27, 2016 at 12:58:23 PM UTC-4, BartC wrote:
>
> >> There would be a list of expression terms that can also form independent
> >> statements. Not knowing Python, the list wo
On Mon, Mar 28, 2016 at 7:49 AM, BartC wrote:
> On 27/03/2016 21:32, Tim Chase wrote:
>>
>> On 2016-03-27 14:28, Steven D'Aprano wrote:
>
>
>>> In this case, the two lines "fnc" and "next" simply look up the
>>> function names, but without actually calling them. They're not
>>> quite "no-ops", sin
On 27 Mar 2016 23:11, "Ben Bacarisse" wrote:
>
> Steven D'Aprano writes:
>
> > On Sun, 27 Mar 2016 05:13 pm, Paul Rubin wrote:
> >
> >> Steven D'Aprano writes:
> >>> For example, would you consider that this isolated C code is
> >>> "meaningless"?
> >>> int i = n + 1;
> >>
> >> It's meaningful a
On 27/03/2016 21:32, Tim Chase wrote:
On 2016-03-27 14:28, Steven D'Aprano wrote:
In this case, the two lines "fnc" and "next" simply look up the
function names, but without actually calling them. They're not
quite "no-ops", since they can fail and raise NameError if the name
doesn't exist, bu
On 2016-03-27 14:28, Steven D'Aprano wrote:
> > So intrigued by this question I tried the following
> > def fnc( n ):
> > print "fnc called with parameter '%d'" % n
> > return n
> >
> > for i in range(0,5):
> > if i%2 == 0:
> > fnc
> > next
> > print i
> >
>
On 27/03/2016 18:19, Ned Batchelder wrote:
On Sunday, March 27, 2016 at 12:58:23 PM UTC-4, BartC wrote:
There would be a list of expression terms that can also form independent
statements. Not knowing Python, the list would comprise function calls
(ie. the function call is top node in the AST
Steven D'Aprano writes:
> On Sun, 27 Mar 2016 05:13 pm, Paul Rubin wrote:
>
>> Steven D'Aprano writes:
>>> For example, would you consider that this isolated C code is
>>> "meaningless"?
>>> int i = n + 1;
>>
>> It's meaningful as long as n is in a certain range of values so there's
>> no overf
Several months ago, I posted a question regarding how to create a list of
functions. I quickly solved the problem on my own, but I am just now getting
around to sharing my solution. It was actually quite simple, and also quite
useful for the problem I had at hand. Below is an example of one w
On 27/03/2016 19:01, Marco S. via Python-list wrote:
Mark Lawrence wrote:
I cannot see this happening unless you provide a patch on the bug
tracker. However I suspect you can get the same thing by subclassing
dict. Why don't you try it and let us know how you get on?
The problem with a vdi
On Sunday, March 27, 2016 at 7:40:06 PM UTC+2, Peter Otten wrote:
> mohamadma...@gmail.com wrote:
>
> > On Sunday, March 27, 2016 at 4:50:01 PM UTC+2, Joel Goldstick wrote:
> >> On Sun, Mar 27, 2016 at 10:38 AM, wrote:
> >>
> >> > Hello there,
> >> > I found a python script in a scientific artic
Steven D'Aprano wrote:
> The point you might have missed is that treating lists as if they were
> mappings violates at least one critical property of mappings: that the
> relationship between keys and values are stable.
This is true for immutable maps, but for mutable ones, you can simply do
ma
mohamadma...@gmail.com wrote:
> On Sunday, March 27, 2016 at 4:50:01 PM UTC+2, Joel Goldstick wrote:
>> On Sun, Mar 27, 2016 at 10:38 AM, wrote:
>>
>> > Hello there,
>> > I found a python script in a scientific article that enables a simple
>> > calculation on an NMR spectrum.
>> > I have no exp
On Sunday, March 27, 2016 at 12:58:23 PM UTC-4, BartC wrote:
> On 27/03/2016 16:48, Ned Batchelder wrote:
> > On Sunday, March 27, 2016 at 10:43:49 AM UTC-4, BartC wrote:
> >> On 27/03/2016 14:47, Dennis Lee Bieber wrote:
>
> >> Well, that could be done in Python (not so usefully because you can't
On Sun, 27 Mar 2016 09:40:57 -0700, mohamadmaaz5 wrote:
> On Sunday, March 27, 2016 at 6:27:59 PM UTC+2, Wildman wrote:
>> On Sun, 27 Mar 2016 09:15:39 -0700, mohamadmaaz5 wrote:
>>
>> > On Sunday, March 27, 2016 at 6:07:43 PM UTC+2, Wildman wrote:
>> >> On Sun, 27 Mar 2016 08:13:49 -0700, mohama
On 27/03/2016 16:48, Ned Batchelder wrote:
On Sunday, March 27, 2016 at 10:43:49 AM UTC-4, BartC wrote:
On 27/03/2016 14:47, Dennis Lee Bieber wrote:
Well, that could be done in Python (not so usefully because you can't
take account of such info until a call is attempted), but that's not
what
On Sunday, March 27, 2016 at 6:27:59 PM UTC+2, Wildman wrote:
> On Sun, 27 Mar 2016 09:15:39 -0700, mohamadmaaz5 wrote:
>
> > On Sunday, March 27, 2016 at 6:07:43 PM UTC+2, Wildman wrote:
> >> On Sun, 27 Mar 2016 08:13:49 -0700, mohamadmaaz5 wrote:
> >>
> >> >> > Hello there,
> >> >> > I found a
On 3/27/2016 11:48 AM, Ned Batchelder wrote:
On Sunday, March 27, 2016 at 10:43:49 AM UTC-4, BartC wrote:
whether fn has an explicit return or not, and not allowing:
fn # and other kinds of expression
unless some keyword is used.
Python *could* have made it an error to have a u
On Sun, 27 Mar 2016 08:13:49 -0700 (PDT), mohamadma...@gmail.com wrote:
> On Sunday, March 27, 2016 at 4:50:01 PM UTC+2, Joel Goldstick wrote:
>> On Sun, Mar 27, 2016 at 10:38 AM, wrote:
>>
>> > Hello there,
>> > I found a python script in a scientific article that enables a simple
>> > calculati
On Sun, 27 Mar 2016 09:15:39 -0700, mohamadmaaz5 wrote:
> On Sunday, March 27, 2016 at 6:07:43 PM UTC+2, Wildman wrote:
>> On Sun, 27 Mar 2016 08:13:49 -0700, mohamadmaaz5 wrote:
>>
>> >> > Hello there,
>> >> > I found a python script
>>
>> The formatting of the script is all wrong. There are m
On Sunday, March 27, 2016 at 6:07:43 PM UTC+2, Wildman wrote:
> On Sun, 27 Mar 2016 08:13:49 -0700, mohamadmaaz5 wrote:
>
> >> > Hello there,
> >> > I found a python script
>
> The formatting of the script is all wrong. There are many
> spaces that should not be there and no indentations. It
>
On 3/26/2016 9:46 PM, gvim wrote:
Given that Python, like Ruby, is an object-oriented language why doesn't
this:
def m():
a = []
for i in range(3): a.append(lambda: i)
return a
def echo_i: return i
b = m()
for n in range(3): print(b[n]()) # => 2 2 2
) # => 2 2 2
... work
On Sun, 27 Mar 2016 08:13:49 -0700, mohamadmaaz5 wrote:
>> > Hello there,
>> > I found a python script
The formatting of the script is all wrong. There are many
spaces that should not be there and no indentations. It
could take a long time to figure it out. It could be just
a copy/paste proble
On Sunday, March 27, 2016 at 10:43:49 AM UTC-4, BartC wrote:
> On 27/03/2016 14:47, Dennis Lee Bieber wrote:
> > On Sun, 27 Mar 2016 12:31:26 +0100, BartC declaimed the
> > following:
> >
> >> On 27/03/2016 07:34, Paul Rubin wrote:
> >>> BartC writes:
> But my suggestion was to have requi
On 3/27/2016 10:18 AM, Bob Gailer wrote:
The problem with putting input at the end of a program is: if the program
raises an exception you won't see it.
What you are saying is that putting input() at the end of a program (or
before any exit point) is insufficient for keeping a window alive if
On Sunday, March 27, 2016 at 9:55:16 AM UTC-4, g vim wrote:
> Given that Python, like Ruby, is an object-oriented language
It turns out that "object-oriented" means very little, and lots
of languages that are object-oriented will behave differently
from each other, even where object behavior is c
gvim writes:
> Given that Python, like Ruby, is an object-oriented language why
> doesn't this:
>
> def m():
> a = []
> for i in range(3): a.append(lambda: i)
> return a
>
> b = m()
> for n in range(3): print(b[n]()) # => 2 2 2
>
> ... work the same as this in Ruby:
>
> def m
> a = []
On Sunday, March 27, 2016 at 4:50:01 PM UTC+2, Joel Goldstick wrote:
> On Sun, Mar 27, 2016 at 10:38 AM, wrote:
>
> > Hello there,
> > I found a python script in a scientific article that enables a simple
> > calculation on an NMR spectrum.
> > I have no experience in programming and i would appr
On Mon, Mar 28, 2016 at 12:24 AM, Hongyi Zhao wrote:
> # replace env
> os.environ.clear()
> os.environ.update(line.partition('=')[::2] for line in output.split('\0'))
>
> Traceback (most recent call last):
> File "/home/werner/anaconda2/lib/python2.7/site-packages/IPython/core/
> interactiveshel
On Sun, Mar 27, 2016 at 10:38 AM, wrote:
> Hello there,
> I found a python script in a scientific article that enables a simple
> calculation on an NMR spectrum.
> I have no experience in programming and i would appreciate it if i can
> communicate with someone who can write this script and send
On 27/03/2016 14:47, Dennis Lee Bieber wrote:
On Sun, 27 Mar 2016 12:31:26 +0100, BartC declaimed the
following:
On 27/03/2016 07:34, Paul Rubin wrote:
BartC writes:
But my suggestion was to have required a keyword in front of
such expressions.
Should there be a keyword in front of a l
Hello there,
I found a python script in a scientific article that enables a simple
calculation on an NMR spectrum.
I have no experience in programming and i would appreciate it if i can
communicate with someone who can write this script and send it to me by mail in
py format. It's a short script
gvim writes:
> Given that Python, like Ruby, is an object-oriented language why
> doesn't this:
>
> def m():
> a = []
> for i in range(3): a.append(lambda: i)
> return a
>
> b = m()
> for n in range(3): print(b[n]()) # => 2 2 2
I'm going to suggest two variations that may or may not wor
The problem with putting input at the end of a program is: if the program
raises an exception you won't see it.
--
https://mail.python.org/mailman/listinfo/python-list
On 27 Mar 2016 17:01, "Ben Finney" wrote:
>
> Hongyi Zhao writes:
>
> > I use the following code the update the os.environ:
> >
> > import os
> > from subprocess import check_output
> >
> > # POSIX: name shall not contain '=', value doesn't contain '\0'
> > output = check_output("source /home/wer
Darin Gordon writes:
> I am very glad to announce the first release of Yosai, a security
> framework for python applications.
>
> Details, including link to project:
> http://www.daringordon.com/introducing_yosai
Rather than just a link, can you please give a couple of paragraphs
explaining what
Hongyi Zhao writes:
> I use the following code the update the os.environ:
>
> import os
> from subprocess import check_output
>
> # POSIX: name shall not contain '=', value doesn't contain '\0'
> output = check_output("source /home/werner/env-intel-toolchains.sh;
> env -0", shell=True, e
Given that Python, like Ruby, is an object-oriented language why doesn't
this:
def m():
a = []
for i in range(3): a.append(lambda: i)
return a
b = m()
for n in range(3): print(b[n]()) # => 2 2 2
... work the same as this in Ruby:
def m
a = []
(0..2).each {|i| a << ->(){i}}
a
e
Hey Everyone!
I am very glad to announce the first release of Yosai, a security framework
for python applications.
Details, including link to project:
http://www.daringordon.com/introducing_yosai
Regards
Darin
--
https://mail.python.org/mailman/listinfo/python-list
Hi all,
Based on the methods here:
http://stackoverflow.com/questions/7040592/calling-the-source-command-
from-subprocess-popen/18897007#comment30954741_12708396
I use the following code the update the os.environ:
import os
from subprocess import check_output
# POSIX: name shall not contain '=
Just in case you didn’t find enough Easter eggs today, we have a whole
basket of them waiting for you: the first set of accepted sessions for
EuroPython 2016 in Bilbao.
*** EuroPython 2016 Session List ***
https://ep2016.europython.eu/en/events/sessions/
The session
On 27/03/2016 07:34, Paul Rubin wrote:
BartC writes:
But my suggestion was to have required a keyword in front of
such expressions.
Should there be a keyword in front of a line containing "sqrt(x)" ?
What about "launch(missiles)" ?
They both look like function calls. Function calls are *v
On Sunday, March 27, 2016 at 11:52:22 AM UTC+2, larudwer wrote:
> how about
>
> sorted(["a", "b"]*3)
> ['a', 'a', 'a', 'b', 'b', 'b']
that's cooler, less efficient though and do not maintain the original order. In
case such order was important, you should proceed as follows:
If the elemen
Antonio Caminero Garcia writes:
> On Saturday, March 26, 2016 at 11:12:58 PM UTC+1, beli...@aol.com wrote:
>> I can create a list that has repeated elements of another list as
>> follows:
>>
>> xx = ["a","b"]
>> nrep = 3
>> print xx
>> yy = []
>> for aa in xx:
>> for i in range(nrep):
>>
On 27/03/2016 07:25, Random832 wrote:
On Sat, Mar 26, 2016, at 23:18, Ben Finney wrote:
What you've demonstrated is that at least one host is violating
communication standards by altering existing reference fields on
messages in transit.
The usenet gateway relays posts that originated on the m
how about
sorted(["a", "b"]*3)
['a', 'a', 'a', 'b', 'b', 'b']
--
https://mail.python.org/mailman/listinfo/python-list
On 27 Mar 2016 10:56, "Steven D'Aprano" wrote:
>
>
> My C is a bit rusty, so excuse me if I get the syntax wrong. I have a
> function:
>
> void foo(int n) {
> int i = n + 1;
> bar(i);
> }
>
> There's a possible overflow of a signed int in there. This is undefined
> behaviour. Now, you migh
On Sunday, March 27, 2016 at 10:02:44 AM UTC+2, Antonio Caminero Garcia wrote:
> On Saturday, March 26, 2016 at 11:12:58 PM UTC+1, beli...@aol.com wrote:
> > I can create a list that has repeated elements of another list as follows:
> >
> > xx = ["a","b"]
> > nrep = 3
> > print xx
> > yy = []
> >
On Saturday, March 26, 2016 at 11:12:58 PM UTC+1, beli...@aol.com wrote:
> I can create a list that has repeated elements of another list as follows:
>
> xx = ["a","b"]
> nrep = 3
> print xx
> yy = []
> for aa in xx:
> for i in range(nrep):
> yy.append(aa)
> print yy
>
> output:
> ['a
On Sunday, March 27, 2016 at 1:10:51 PM UTC+5:30, Steven D'Aprano wrote:
> On Sun, 27 Mar 2016 05:13 pm, Paul Rubin wrote:
>
> > No it's not meaningless if it "might" overflow, it's meaningless if it
> > -does- overflow,
>
> No! That's exactly wrong!
>
> Paul, thank you for inadvertently provin
On Sun, 27 Mar 2016 01:30 am, Chris Angelico wrote:
> On Sun, Mar 27, 2016 at 1:09 AM, BartC wrote:
>> I'm surprised that both C and Python allow statements that apparently do
>> nothing. In both, an example is:
>>
>> x
>>
>> on a line by itself. This expression is evaluated, but then any resul
On Sun, 27 Mar 2016 05:13 pm, Paul Rubin wrote:
> Steven D'Aprano writes:
>> For example, would you consider that this isolated C code is
>> "meaningless"?
>> int i = n + 1;
>
> It's meaningful as long as n is in a certain range of values so there's
> no overflow.
>
>> But according to the stan
On Sat, 26 Mar 2016 08:23 am, Chris Angelico wrote:
> On Sat, Mar 26, 2016 at 2:50 AM, Steven D'Aprano
> wrote:
>> Undefined behaviour does not mean "implementation specific behaviour".
>> Nor does it mean "something sensible will happen but we don't promise
>> what it will be". It means "the co
On Sunday, March 27, 2016 at 12:05:01 PM UTC+5:30, Paul Rubin wrote:
> Rustom Mody writes:
> > eg haskell (ghc) is written in ghc
> > Where did the first bootstrap start from?
>
> The very earliest Haskell implementation was written in Lisp.
Ummm So you found a little chink in my argument -- Ok :
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