Terry Reedy tjre...@udel.edu Wrote in message:
On 2/13/2014 1:37 PM, forman.si...@gmail.com wrote:
I ran across this and I thought there must be a better way of doing it, but
then after further consideration I wasn't so sure.
if key[:1] + key[-1:] == '': ...
if key[:1] == '' and
In article mailman.6914.1392380171.18130.python-l...@python.org,
Dave Angel da...@davea.name wrote:
Terry Reedy tjre...@udel.edu Wrote in message:
On 2/13/2014 1:37 PM, forman.si...@gmail.com wrote:
I ran across this and I thought there must be a better way of doing it,
but then after
On Thursday, February 13, 2014 7:26:48 PM UTC-8, Ned Batchelder wrote:
On 2/13/14 9:45 PM, forman.si...@gmail.com wrote:
For the record I wasn't worried about the performance. ;-)
It was for Tkinter event strings not markup tags.
I'm glad this was the time winner!
key
On 14/02/2014 20:04, forman.si...@gmail.com wrote:
On Thursday, February 13, 2014 7:26:48 PM UTC-8, Ned Batchelder wrote:
On 2/13/14 9:45 PM, forman.si...@gmail.com wrote:
For the record I wasn't worried about the performance. ;-)
It was for Tkinter event strings not markup tags.
On Friday, February 14, 2014 1:01:48 PM UTC-8, Mark Lawrence wrote:
[snip]
Pleased to have you on board, as I'm know that Terry Reedy et al can do
with a helping hand.
But please note you appear to be using google groups, hence the double
line spacing above and trying to reply to
(Apologies if this results in a double-post.)
On Friday, February 14, 2014 1:01:48 PM UTC-8, Mark Lawrence wrote:
[snip]
Pleased to have you on board, as I'm know that Terry Reedy et al can do
with a helping hand.
But please note you appear to be using google groups, hence the double
I ran across this and I thought there must be a better way of doing it, but
then after further consideration I wasn't so sure.
if key[:1] + key[-1:] == '': ...
Some possibilities that occurred to me:
if key.startswith('') and key.endswith(''): ...
and:
if (key[:1], key[-1:]) == ('',
In article 4cc09129-43ee-4205-a24c-03f92b594...@googlegroups.com,
forman.si...@gmail.com wrote:
I ran across this and I thought there must be a better way of doing it, but
then after further consideration I wasn't so sure.
if key[:1] + key[-1:] == '': ...
Some possibilities that
On 02/13/2014 10:37 AM, forman.si...@gmail.com wrote:
I ran across this and I thought there must be a better way of doing it, but
then after further consideration I wasn't so sure.
if key[:1] + key[-1:] == '': ...
Some possibilities that occurred to me:
if key.startswith('') and
On 13/02/2014 18:37, forman.si...@gmail.com wrote:
I ran across this and I thought there must be a better way of doing it, but
then after further consideration I wasn't so sure.
if key[:1] + key[-1:] == '': ...
Some possibilities that occurred to me:
if key.startswith('') and
On 02/13/2014 11:09 AM, Mark Lawrence wrote:
All I can say is that if you're worried about the speed of a single line of
code like the above then you've got
problems. Having said that, I suspect that using an index to extract a single
character has to be faster than using a
slice, but I
forman.si...@gmail.com writes:
I ran across this and I thought there must be a better way of doing
it, but then after further consideration I wasn't so sure.
if key[:1] + key[-1:] == '': ...
Some possibilities that occurred to me:
if key.startswith('') and key.endswith(''): ...
and:
On 02/13/2014 11:20 AM, Ethan Furman wrote:
On 02/13/2014 11:09 AM, Mark Lawrence wrote:
All I can say is that if you're worried about the speed of a single
line of code like the above then you've got problems. Having said
that, I suspect that using an index to extract a single character
has
On 2014-02-13, Ethan Furman et...@stoneleaf.us wrote:
On 02/13/2014 11:09 AM, Mark Lawrence wrote:
All I can say is that if you're worried about the speed of a
single line of code like the above then you've got problems.
Having said that, I suspect that using an index to extract a
single
On 2014-02-13, forman.si...@gmail.com forman.si...@gmail.com
wrote:
I ran across this and I thought there must be a better way of
doing it, but then after further consideration I wasn't so
sure.
if key[:1] + key[-1:] == '': ...
Some possibilities that occurred to me:
if
On 13/02/2014 19:25, Neil Cerutti wrote:
On 2014-02-13, Ethan Furman et...@stoneleaf.us wrote:
On 02/13/2014 11:09 AM, Mark Lawrence wrote:
All I can say is that if you're worried about the speed of a
single line of code like the above then you've got problems.
Having said that, I suspect that
In article mailman.6859.1392319225.18130.python-l...@python.org,
Ethan Furman et...@stoneleaf.us wrote:
On 02/13/2014 11:09 AM, Mark Lawrence wrote:
All I can say is that if you're worried about the speed of a single line of
code like the above then you've got
problems. Having said
forman.si...@gmail.com wrote:
I ran across this and I thought there must be a better way of doing it,
but then after further consideration I wasn't so sure.
if key[:1] + key[-1:] == '': ...
Some possibilities that occurred to me:
if key.startswith('') and key.endswith(''): ...
On 02/13/2014 11:17 AM, Neil Cerutti wrote:
On 2014-02-13, forman.si...@gmail.com forman.si...@gmail.com
wrote:
I ran across this and I thought there must be a better way of
doing it, but then after further consideration I wasn't so
sure.
if key[:1] + key[-1:] == '': ...
Some possibilities
On 2014-02-13, Peter Otten __pete...@web.de wrote:
forman.si...@gmail.com wrote:
The first is too clever for my taste.
The second is fast and easy to understand. It might attract
improvements replacing the slice with an index, but I trust
you will catch that with your unit tests ;)
It's
On 02/13/2014 11:43 AM, Peter Otten wrote:
forman.si...@gmail.com wrote:
I ran across this and I thought there must be a better way of doing it,
but then after further consideration I wasn't so sure.
if key[:1] + key[-1:] == '': ...
Some possibilities that occurred to me:
if
Peter Otten __pete...@web.de:
Personally, I'm willing to spend the few extra milliseconds and use
the foolproof third.
Speaking of foolproof, what is this key? Is it an XML start tag,
maybe? Then, how does your test fare with, say,
start comparison=
which is equivalent to
start
On Thu, Feb 13, 2014 at 12:37 PM, forman.si...@gmail.com wrote:
I ran across this and I thought there must be a better way of doing it, but
then after further consideration I wasn't so sure.
if key[:1] + key[-1:] == '': ...
Some possibilities that occurred to me:
if
On Fri, Feb 14, 2014 at 6:32 AM, Mark Lawrence breamore...@yahoo.co.uk wrote:
There will be an exception only if it is zero-length. But good
point! That's a pretty sneaky way to avoid checking for a
zero-length string. Is it a popular idiom?
I hope not.
The use of slicing rather than
On 2014-02-13 10:37, forman.si...@gmail.com wrote:
I ran across this and I thought there must be a better way of doing
it, but then after further consideration I wasn't so sure.
Some possibilities that occurred to me:
if key.startswith('') and key.endswith(''): ...
This is my favorite
On 2/13/2014 11:59 AM, Zachary Ware wrote:
In a fit of curiosity, I did some timings:
Snip of lots of TMTOWTDT/TIMTOWTDI/whatever... timed examples :)
But I didn't see this one:
s[::len(s)-1]
Emile
--
https://mail.python.org/mailman/listinfo/python-list
On 2014-02-13, Zachary Ware zachary.ware+pyl...@gmail.com wrote:
In a fit of curiosity, I did some timings:
'and'ed indexing:
C:\tmppy -m timeit -s key = 'test' key[0] == '' and key[-1] == ''
100 loops, best of 3: 0.35 usec per loop
C:\tmppy -m timeit -s key = 'test' key[0] == '' and
On Fri, Feb 14, 2014 at 7:55 AM, Emile van Sebille em...@fenx.com wrote:
On 2/13/2014 11:59 AM, Zachary Ware wrote:
In a fit of curiosity, I did some timings:
Snip of lots of TMTOWTDT/TIMTOWTDI/whatever... timed examples :)
But I didn't see this one:
s[::len(s)-1]
Chris Angelico wrote:
On Fri, Feb 14, 2014 at 7:55 AM, Emile van Sebille em...@fenx.com wrote:
On 2/13/2014 11:59 AM, Zachary Ware wrote:
In a fit of curiosity, I did some timings:
Snip of lots of TMTOWTDT/TIMTOWTDI/whatever... timed examples :)
But I didn't see this one:
s[::len(s)-1]
On Fri, Feb 14, 2014 at 8:06 AM, Peter Otten __pete...@web.de wrote:
For the record:
s = x
s[::len(s)-1]
Traceback (most recent call last):
File stdin, line 1, in module
ValueError: slice step cannot be zero
And that, my friends, is a classic example of a Python exception that
ought to
On 13/02/2014 21:01, Neil Cerutti wrote:
On 2014-02-13, Zachary Ware zachary.ware+pyl...@gmail.com wrote:
In a fit of curiosity, I did some timings:
'and'ed indexing:
C:\tmppy -m timeit -s key = 'test' key[0] == '' and key[-1] == ''
100 loops, best of 3: 0.35 usec per loop
C:\tmppy -m
On Thu, Feb 13, 2014 at 2:55 PM, Emile van Sebille em...@fenx.com wrote:
On 2/13/2014 11:59 AM, Zachary Ware wrote:
In a fit of curiosity, I did some timings:
Snip of lots of TMTOWTDT/TIMTOWTDI/whatever... timed examples :)
But I didn't see this one:
s[::len(s)-1]
It's not great, around
On Thu, Feb 13, 2014 at 3:01 PM, Neil Cerutti ne...@norwich.edu wrote:
On 2014-02-13, Zachary Ware zachary.ware+pyl...@gmail.com wrote:
C:\tmppy -m timeit -s key = '' key[0] == '' and key[-1] == ''
Traceback (most recent call last):
File P:\Python34\lib\timeit.py, line 292, in main
x =
In article mailman.6880.1392324956.18130.python-l...@python.org,
Emile van Sebille em...@fenx.com wrote:
On 2/13/2014 11:59 AM, Zachary Ware wrote:
In a fit of curiosity, I did some timings:
Snip of lots of TMTOWTDT/TIMTOWTDI/whatever... timed examples :)
But I didn't see this one:
On 2/13/2014 1:10 PM, Chris Angelico wrote:
On Fri, Feb 14, 2014 at 8:06 AM, Peter Otten __pete...@web.de wrote:
For the record:
s = x
s[::len(s)-1]
Traceback (most recent call last):
File stdin, line 1, in module
ValueError: slice step cannot be zero
And that, my friends, is a classic
On Fri, Feb 14, 2014 at 8:19 AM, Zachary Ware
zachary.ware+pyl...@gmail.com wrote:
Also, uglier than sin itself.
Hey hey, no need to insult our lovely trigonometric functions!
ChrisA
--
https://mail.python.org/mailman/listinfo/python-list
In article mailman.6891.1392327074.18130.python-l...@python.org,
Chris Angelico ros...@gmail.com wrote:
On Fri, Feb 14, 2014 at 8:19 AM, Zachary Ware
zachary.ware+pyl...@gmail.com wrote:
Also, uglier than sin itself.
Hey hey, no need to insult our lovely trigonometric functions!
This
On Thu, Feb 13, 2014 at 3:31 PM, Chris Angelico ros...@gmail.com wrote:
On Fri, Feb 14, 2014 at 8:19 AM, Zachary Ware
zachary.ware+pyl...@gmail.com wrote:
Also, uglier than sin itself.
Hey hey, no need to insult our lovely trigonometric functions!
Here's your sine...
--
Zach
--
13.02.14 21:59, Zachary Ware написав(ла):
don't use re for simple stuff (because while it may be very fast, it's
dominated by attribute lookup and function call overhead),
And the time of re variant depends on the size of input.
--
https://mail.python.org/mailman/listinfo/python-list
In article mailman.6893.1392328170.18130.python-l...@python.org,
Serhiy Storchaka storch...@gmail.com wrote:
13.02.14 21:59, Zachary Ware напиÑав(ла):
don't use re for simple stuff (because while it may be very fast, it's
dominated by attribute lookup and function call overhead),
On 02/13/2014 01:01 PM, Chris Angelico wrote:
On Fri, Feb 14, 2014 at 7:55 AM, Emile van Sebille em...@fenx.com wrote:
On 2/13/2014 11:59 AM, Zachary Ware wrote:
In a fit of curiosity, I did some timings:
Snip of lots of TMTOWTDT/TIMTOWTDI/whatever... timed examples :)
But I didn't see
On Fri, Feb 14, 2014 at 8:33 AM, Ethan Furman et...@stoneleaf.us wrote:
Oh, it's not that bad! All you have to do is handle the edge case of an
empty string:
s[::len(s)-1 if s else True]
*ducks and runs*
And the edge case of the one-character string. Also, it's been noted
that calling the
On 02/13/2014 02:13 PM, Chris Angelico wrote:
On Fri, Feb 14, 2014 at 8:33 AM, Ethan Furman et...@stoneleaf.us wrote:
Oh, it's not that bad! All you have to do is handle the edge case of an
empty string:
s[::len(s)-1 if s else True]
And the edge case of the one-character string.
Oops, my
On 2/13/2014 1:37 PM, forman.si...@gmail.com wrote:
I ran across this and I thought there must be a better way of doing it, but
then after further consideration I wasn't so sure.
if key[:1] + key[-1:] == '': ...
if key[:1] == '' and key[-1:] == ': ...
is the obvious choice to me. If the
On 02/13/2014 01:24 PM, Roy Smith wrote:
Emile van Sebille wrote:
But I didn't see this one:
s[::len(s)-1]
I love it. I need to add this to my list of Python trivia questions.
Great interview question: What does this do? What is its weakness? How would
you fix it?
--
~Ethan~
--
For the record I wasn't worried about the performance. ;-)
It was for Tkinter event strings not markup tags.
I'm glad this was the time winner!
key and key[0] == '' and key[-1] == ''
Cheers to the folks who did the timings (and saved me from the trouble!)
Last but not least...
On 2/13/14 9:45 PM, forman.si...@gmail.com wrote:
For the record I wasn't worried about the performance. ;-)
It was for Tkinter event strings not markup tags.
I'm glad this was the time winner!
key and key[0] == '' and key[-1] == ''
Cheers to the folks who did the timings (and saved me
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