[EMAIL PROTECTED] (Alex Martelli) wrote in
news:[EMAIL PROTECTED]:
> Aahz <[EMAIL PROTECTED]> wrote:
>> I would agree with people who claim
>> that you should memorize most of the built-in functions (which is
>> precisely why there is a high barrier to adding more built-in
>> functions).
>
> I
Jan Vorwerk <[EMAIL PROTECTED]> wrote:
> [ lots of sensible stuff to discover "reversed" ]
> >>> print reversed.__doc__
See also:
>>> help(reversed)
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"Frankly I have no feelings towards penguins one way or the other"
-- Arth
Martin Durkin a écrit , le 02.07.2007 06:38:
> This is an interesting point to me. I am just learning Python and I
> wonder how I would know that a built in function already exists?
> At what point do I stop searching for a ready made solution to a
> particular problem and start programming my o
Aahz <[EMAIL PROTECTED]> wrote:
...
> This works in all versions of Python back to 1.5.2 IIRC. reversed() is
> a moderately new built-in function;
Yep: it came with Python 2.4, first alpha just 4 years ago, final
release about 3 years and 8 months ago. "Moderately new" seems an
appropriate ta
In article <[EMAIL PROTECTED]>,
Martin Durkin <[EMAIL PROTECTED]> wrote:
>[EMAIL PROTECTED] (Alex Martelli) wrote in
>news:[EMAIL PROTECTED]:
>>
>> So, something like:
>>
>> for c in reversed(x): print c
>>
>> is mostly likely how I'd present the solution to the task.
>
>This is an interesting
Martin Durkin <[EMAIL PROTECTED]> writes:
> Is it just a matter of reading *all* the documentation before I start
> coding?
It's worth spending an hour or two reading through the library manual,
yes.
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[EMAIL PROTECTED] (Alex Martelli) wrote in
news:[EMAIL PROTECTED]:
> Martin Durkin <[EMAIL PROTECTED]> wrote:
>...
>> >> def rev(x):
>> >>> mylist = []
>> >>> for char in x:
>> >>> mylist.append(char)
>> >>> mylist.reverse()
>> >>>
Alex Martelli wrote:
> since what you're doing is...:
>
s = "onomatopoeia"
s = s.join(s[::-1])
s
> 'aonomatopoeiaionomatopoeiaeonomatopoeiaoonomatopoeiaponomatopoeiaoonoma
> topoeiatonomatopoeiaaonomatopoeiamonomatopoeiaoonomatopoeianonomatopoeia
> o'
>
> ...which isn't really jus
Alex Martelli wrote:
> Martin Durkin <[EMAIL PROTECTED]> wrote:
>...
> print "\n".join("spam"[::-1])
>...
OK, maybe I'm missing the point here as I'm new to Python. The first
one seems clearer to me. What am I missing?
>>> I think all you are missing is familarity wit
Jay Loden <[EMAIL PROTECTED]> wrote:
...
> For what it's worth, with python 2.5 on my Macbook:
Hmmm, doesn't look to me as if it's worth much...:
> [EMAIL PROTECTED] jloden]$ python -m timeit 's = "onomatopoeia"; s =
s.join(s[::-1])'
since what you're doing is...:
>>> s = "onomatopoeia"
>>>
Martin Durkin <[EMAIL PROTECTED]> wrote:
...
> >> def rev(x):
> >>> mylist = []
> >>> for char in x:
> >>> mylist.append(char)
> >>> mylist.reverse()
> >>> for letter in mylist:
> >>> print letter
> >>>
> >>>
Evan Klitzke wrote:
>
>> I guess that's it. The first one reads more like a textbook example which
>> is about where I am at. Is there any speed benefit from the one liner?
>
> The one line is quite a bit faster:
>
> [EMAIL PROTECTED] ~ $ python -m timeit 's = "onomatopoeia"; s =
> s.join(s[::-
On 1 Jul 2007 11:09:40 GMT, Martin Durkin <[EMAIL PROTECTED]> wrote:
> Duncan Booth <[EMAIL PROTECTED]> wrote in
> news:[EMAIL PROTECTED]:
>
> > Martin Durkin <[EMAIL PROTECTED]> wrote:
> >
> >> def rev(x):
> >>> mylist = []
> >>> for char in x:
> >>> my
Martin Durkin wrote:
> Duncan Booth <[EMAIL PROTECTED]> wrote in
> news:[EMAIL PROTECTED]:
>
>> Martin Durkin <[EMAIL PROTECTED]> wrote:
>>
>>> def rev(x):
mylist = []
for char in x:
mylist.append(char)
mylist.reverse()
Duncan Booth <[EMAIL PROTECTED]> wrote in
news:[EMAIL PROTECTED]:
> Martin Durkin <[EMAIL PROTECTED]> wrote:
>
>> def rev(x):
>>> mylist = []
>>> for char in x:
>>> mylist.append(char)
>>> mylist.reverse()
>>> for letter in myl
Martin Durkin <[EMAIL PROTECTED]> wrote:
> def rev(x):
>> mylist = []
>> for char in x:
>> mylist.append(char)
>> mylist.reverse()
>> for letter in mylist:
>> print letter
>>
>> However, compare the incredible d
ptn <[EMAIL PROTECTED]> wrote in news:1182997438.541012.54100
@o61g2000hsh.googlegroups.com:
>
def rev(x):
> mylist = []
> for char in x:
> mylist.append(char)
> mylist.reverse()
> for letter in mylist:
> print
> mylist = []
>
> That's bad. If you need to use a list in the rev function, you
> should bind a new list to a local variable inside rev.
>
He's right. If you want to use a list to temporarily store the
reversed version of your string, it should exist only in the local
namespace of your funct
>
> or one letter per line:
>
> >>> print "\n".join("spam"[::-1])
>
> m
> a
> p
> s
>
One liners rock ;)
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On 2007-06-27, Scott <[EMAIL PROTECTED]> wrote:
> Yeah I know strings == immutable, but question 1 in section
> 7.14 of "How to think like a computer Scientist" has me trying
> to reverse one.
No, it just wants to to print the characters in reverse, one per
line.
> I've come up with two things, o
"Scott" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
| Yeah I know strings == immutable, but question 1 in section 7.14 of "How
to
| think like a computer Scientist" has me trying to reverse one.
>>> 'this is a test'[::-1]
'tset a si siht'
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> Původní zpráva
> Od: Will Maier <[EMAIL PROTECTED]>
> Předmět: Re: Reversing a string
> Datum: 27.6.2007 19:08:40
>
> On Wed, Jun 27, 2007 at 12:53:36PM -0400, Scott wrote:
> > So how on earth wou
Scott wrote:
> Yeah I know strings == immutable, but question 1 in section 7.14 of "How
> to think like a computer Scientist" has me trying to reverse one.
>
> I've come up with two things, one works almost like it should except that
> every traversal thru the string I've gotten it to repeat the
Scott wrote:
> So how on earth would be the best way to: Write a function that takes a
> string as an argument and outputs the letters backward, one per line.
Homework?
Anyway, what about:
for c in string[::-1]:
print c
Stefan
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On Wed, Jun 27, 2007 at 12:53:36PM -0400, Scott wrote:
> So how on earth would be the best way to: Write a function that
> takes a string as an argument and outputs the letters backward,
> one per line.
>>> def rev(forward):
... backward = list(forward)
... backward.reverse()
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