In article <[EMAIL PROTECTED]>,
Steven D'Aprano <[EMAIL PROTECTED]> wrote:
>On Thu, 23 Feb 2006 12:04:38 -0700, Bob Greschke wrote:
>
>>> try:
>>>i = a.find("3")
>>>print "It's here: ", i
>>> except NotFound:
>>>print "No 3's here"
>>
>> Nuts. I guess you're right. It wouldn't be pr
Paul Rubin wrote:
> "Kay Schluehr" <[EMAIL PROTECTED]> writes:
> > Hmm. A statement has side-effects but it returns no value. And yes, you
> > can create a name within an expression producing a value in Python,
> > using a list/generator comprehension. The solution to Bob's problem
> > would look
"Kay Schluehr" <[EMAIL PROTECTED]> writes:
> Hmm. A statement has side-effects but it returns no value. And yes, you
> can create a name within an expression producing a value in Python,
> using a list/generator comprehension. The solution to Bob's problem
> would look like this:
>
> if (I for I i
Roy Smith wrote:
> Bob Greschke <[EMAIL PROTECTED]> wrote:
> >I miss being able to do something like this in Python
> >
> >1f (I = a.find("3")) != -1:
> >print "It's here: ", I
> >else:
> >print "No 3's here"
> >
> >where I gets assigned the index returned by find() AND the if statement ge
Roy Smith wrote:
> In article <[EMAIL PROTECTED]>,
> Steven D'Aprano <[EMAIL PROTECTED]> wrote:
>
>> Side-effects aren't always bad (import, for example, does all its work by
>> side-effect). But they are generally frowned upon, and in functional
>> languages they are verboten.
>
> How do you d
On Fri, 24 Feb 2006 08:03:49 -0500, Roy Smith wrote:
> In article <[EMAIL PROTECTED]>,
> Steven D'Aprano <[EMAIL PROTECTED]> wrote:
>
>> Side-effects aren't always bad (import, for example, does all its work by
>> side-effect). But they are generally frowned upon, and in functional
>> languages
Roy Smith:
>How do you do any I/O in a functional language if side effects are
>verboten?
The user is a function. Output is its parameter, input its return value.
The user is not allowed to maintain state ;-)
>For that matter, how does a functional program ever stop running?
By returning to t
In article <[EMAIL PROTECTED]>,
Steven D'Aprano <[EMAIL PROTECTED]> wrote:
> Side-effects aren't always bad (import, for example, does all its work by
> side-effect). But they are generally frowned upon, and in functional
> languages they are verboten.
How do you do any I/O in a functional langu
On Fri, 24 Feb 2006 06:45:41 -0500, Kent Johnson wrote:
> Steven D'Aprano wrote:
>> Now that's a Python wart: using >>> for the prompt for interactive
>> sessions. It makes it ambiguous when posting code in email or newsgroups,
>> especially once the code gets quoted a few times.
>
> So change it
Op 2006-02-23, Roy Smith schreef <[EMAIL PROTECTED]>:
> Bob Greschke <[EMAIL PROTECTED]> wrote:
>>I miss being able to do something like this in Python
>>
>>1f (I = a.find("3")) != -1:
>>print "It's here: ", I
>>else:
>>print "No 3's here"
>>
>>where I gets assigned the index returned by fi
Steven D'Aprano wrote:
> Now that's a Python wart: using >>> for the prompt for interactive
> sessions. It makes it ambiguous when posting code in email or newsgroups,
> especially once the code gets quoted a few times.
So change it. My pythonstartup.py contains:
import sys
sys.ps1 = ' >>> '
sys.
On Fri, 24 Feb 2006 02:02:02 -0800, bonono wrote:
>> "test".index("a")
>> > Traceback (most recent call last):
>> > File "", line 1, in -toplevel-
>> > "test".index("a")
>> > ValueError: substring not found
>> "test".find("a")
>> > -1
>>
>>
>> Did you have a point?
>>
> It was abou
Steven D'Aprano wrote:
> On Thu, 23 Feb 2006 16:49:09 -0800, bonono wrote:
>
> >
> > Steven D'Aprano wrote:
> >> On Thu, 23 Feb 2006 12:04:38 -0700, Bob Greschke wrote:
> >>
> >> >> try:
> >> >>i = a.find("3")
> >> >>print "It's here: ", i
> >> >> except NotFound:
> >> >>print "No 3's
On Thu, 23 Feb 2006 16:49:09 -0800, bonono wrote:
>
> Steven D'Aprano wrote:
>> On Thu, 23 Feb 2006 12:04:38 -0700, Bob Greschke wrote:
>>
>> >> try:
>> >>i = a.find("3")
>> >>print "It's here: ", i
>> >> except NotFound:
>> >>print "No 3's here"
>> >
>> > Nuts. I guess you're right.
On Thu, 23 Feb 2006 20:41:52 -0600, Terry Hancock wrote:
> On Fri, 24 Feb 2006 09:14:53 +1100
> "Steven D'Aprano" <[EMAIL PROTECTED]> wrote:
>> There are *reasons* why Python discourages functions with
>> side-effects. Side-effects make your code hard to test and
>> harder to debug.
>
> You of co
On Fri, 24 Feb 2006 09:14:53 +1100
"Steven D'Aprano" <[EMAIL PROTECTED]> wrote:
> There are *reasons* why Python discourages functions with
> side-effects. Side-effects make your code hard to test and
> harder to debug.
You of course meant "expressions with side-effects". Python
is pretty good at
"Bob Greschke" <[EMAIL PROTECTED]> writes:
> I miss being able to do something like this in Python
>
> 1f (I = a.find("3")) != -1:
> print "It's here: ", I
> else:
> print "No 3's here"
>
> where I gets assigned the index returned by find() AND the if statement gets
> to do its job in th
Steven D'Aprano wrote:
> On Thu, 23 Feb 2006 12:04:38 -0700, Bob Greschke wrote:
>
> >> try:
> >>i = a.find("3")
> >>print "It's here: ", i
> >> except NotFound:
> >>print "No 3's here"
> >
> > Nuts. I guess you're right. It wouldn't be proper. Things are added or
> > proposed every
On Thu, 23 Feb 2006 12:04:38 -0700, Bob Greschke wrote:
>> try:
>>i = a.find("3")
>>print "It's here: ", i
>> except NotFound:
>>print "No 3's here"
>
> Nuts. I guess you're right. It wouldn't be proper. Things are added or
> proposed every day for Python that I can't even pronoun
On Thu, 23 Feb 2006 12:04:38 -0700 in comp.lang.python, "Bob Greschke"
<[EMAIL PROTECTED]> wrote:
>
>"Roy Smith" <[EMAIL PROTECTED]> wrote in message
>news:[EMAIL PROTECTED]
[...]
>> try:
>>i = a.find("3")
>>print "It's here: ", i
>> except NotFound:
>>print "No 3's here"
>
>Nuts. I
But maybe we're talking about string methods so to get an exception
we'd want to use "index" instead of "find".
Giles
--
http://mail.python.org/mailman/listinfo/python-list
"Roy Smith" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Bob Greschke <[EMAIL PROTECTED]> wrote:
>>I miss being able to do something like this in Python
>>
>>1f (I = a.find("3")) != -1:
>>print "It's here: ", I
>>else:
>>print "No 3's here"
>>
>>where I gets assigned the
Bob Greschke <[EMAIL PROTECTED]> wrote:
>I miss being able to do something like this in Python
>
>1f (I = a.find("3")) != -1:
>print "It's here: ", I
>else:
>print "No 3's here"
>
>where I gets assigned the index returned by find() AND the if statement gets
>to do its job in the same line.
I miss being able to do something like this in Python
1f (I = a.find("3")) != -1:
print "It's here: ", I
else:
print "No 3's here"
where I gets assigned the index returned by find() AND the if statement gets
to do its job in the same line. Then you don't have to have another like
that
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