On Sun, 12 Sep 2010 09:03:49 am Walter Prins wrote:
> So, perhaps it's an idea to call dir() on a given object and see
> whether the object provides the necessary methods to function, e.g.
> __iter__, __delitem__, __setitem__ and friends?
There's no need to do this:
attributes = dir(obj)
if '__i
Just a quick contribution for what it's worth: One of the subjects being
implicitly talked about here is "introspection" -- you may want to google
that and see else you can find. That said, a nice article covering some of
Python's introspection features is presented here on IBM's site:
http://www.i
Hi Jan and Steven,
Thanks a lot for your valuable comments. I greatly appreciate you looking into
it.
Steven, you recommend to <>. On
one website it was mentioned that "To a young boy with a hammer, everything
looks like a nail". Which meant to say that just because you CAN use a design
patte
> From: rwob...@hotmail.com
> To: bgai...@gmail.com
> Subject: RE: [Tutor] exceptions problem
> Date: Sat, 11 Sep 2010 18:51:12 +
>
>
>
>
>
>> Date: Sat, 11 Sep 2010 14:43:28 -0400
>> From: bgai...@gmail.com
>>
> From: rwob...@hotmail.com
> To: st...@pearwood.info
> Subject: RE: [Tutor] recursive problem
> Date: Sat, 11 Sep 2010 18:39:31 +
>
>
>
>
>
>> From: st...@pearwood.info
>> To: tutor@python.org
>> Date: Sun, 12
On 09/12/10 03:18, Steven D'Aprano wrote:
> Or you could do this:
>
> if do_this_will_succeed() and do_that_will_succeed() \
> and do_something_else_will_succeed():
> do_this()
> do_that()
> do_something_else()
> else:
> do_error()
>
> But that hasn't done anything to prevent race
Hello,
It is bloody Winblows. The script works as designed and traps the 401
exception on my slackware box ... something in the implementation of
urllib2 on Windoze is broken. This has to be a known issue. Just did
not see it known anywhere.
Thanks.
mp
On Sat, Sep 11, 2010 at 02:16:07PM -040
On 9/11/2010 12:12 PM, Roelof Wobben wrote:
Date: Sat, 11 Sep 2010 11:05:54 -0400
From: bgai...@gmail.com
To: tutor@python.org
Subject: Re: [Tutor] exceptions problem
On 9/11/2010 6:56 AM, Peter Otten wrote:
Steven D'Aprano wrote:
On Sat, 11 Sep 20
On Sun, 12 Sep 2010 04:09:20 am Roelof Wobben wrote:
> > On Sun, 12 Sep 2010 03:40:38 am Roelof Wobben wrote:
> >> But why is type checking then wrong.
> >> Lets says I want a module who must work on strings, tuple and
> >> lists.
> >
> > It's not *always* wrong, but let me ask you... why do you w
On Sun, 12 Sep 2010 04:01:39 am Walter Prins wrote:
> I guess the question to ask/consider is: How can be establish whether
> a particular object supports a particular interface/set of behaviours
> that we require? E.g. how do we most pythonically check whether some
> object "walks like a list" a
On Sat, Sep 11, 2010 at 10:48:13AM -0400, Michael Powe wrote:
> On Sat, Sep 11, 2010 at 02:25:24PM +0200, Evert Rol wrote:
> >
>
> > >> I'm not sure what you're exactly doing here, or what you're getting,
> > >> but I did get curious and dug around urllib2.py. Apparently, there is
> > >> a hardc
> From: st...@pearwood.info
> To: tutor@python.org
> Date: Sun, 12 Sep 2010 04:03:43 +1000
> Subject: Re: [Tutor] recursive problem
>
> On Sun, 12 Sep 2010 03:40:38 am Roelof Wobben wrote:
>
>> But why is type checking then wrong.
>> Lets says I want a mo
On 09/12/10 04:01, Walter Prins wrote:
> I guess the question to ask/consider is: How can be establish whether a
> particular object supports a particular interface/set of behaviours that
> we require? E.g. how do we most pythonically check whether some object
> "walks like a list" and "quacks lik
> From: rwob...@hotmail.com
> To: wpr...@gmail.com
> Subject: RE: [Tutor] recursive problem
> Date: Sat, 11 Sep 2010 18:05:12 +
>
>
>
>
>
>> Date: Sat, 11 Sep 2010 19:01:39 +0100
>> Subject: Re: [Tutor] recursive probl
On Sun, 12 Sep 2010 02:00:02 am Lie Ryan wrote:
> As an alternative solution, you can derive from UserList and overload
> the __getitem__ and __setitem__ operator:
We've been able to inherit from list directly since at least Python 2.2.
Why are you using UserList?
--
Steven D'Aprano
On Sun, 12 Sep 2010 03:40:38 am Roelof Wobben wrote:
> But why is type checking then wrong.
> Lets says I want a module who must work on strings, tuple and lists.
It's not *always* wrong, but let me ask you... why do you want to
*limit* the function to work on ONLY strings, tuples and lists?
Th
> That's the whole point! You don't WANT to know what type it is. You want to
> just use it how you want, an if it behaves properly, who cares what type it
> is?
>
> See when you type check you are forcing the user to use those types. What
> if they want to derive a subclass from list? Is there rea
On 2:59 PM, Roelof Wobben wrote:
Hello Bob,
Oke, I try to fish.
When I do
x="a"
y=nt(x)
Then I get ValueError.
When I do
x= 1.2
y=int(x)
No exception is raised.
But when I do then x = I get a false.
When I now do float(x) - int(x) I get 1.2 - 1 =.2 and that's greater then 0
Because one
On Sep 11, 2010, at 12:40 PM, Roelof Wobben wrote:
>
>
>
>
>> From: st...@pearwood.info
>> To: tutor@python.org
>> Date: Sun, 12 Sep 2010 03:27:42 +1000
>> Subject: Re: [Tutor] recursive problem
>>
>> On Sun, 12 Sep 2010 03:18:19 am Steven D'Aprano wr
> From: st...@pearwood.info
> To: tutor@python.org
> Date: Sun, 12 Sep 2010 03:27:42 +1000
> Subject: Re: [Tutor] recursive problem
>
> On Sun, 12 Sep 2010 03:18:19 am Steven D'Aprano wrote:
>
>> But that hasn't done anything to prevent race conditions. S
On Sun, 12 Sep 2010 03:18:19 am Steven D'Aprano wrote:
> But that hasn't done anything to prevent race conditions. So the real
> reason people use LBYL is that they're too lazy to write hideously
> ugly, but reliable, code, and they're just hoping that they will
> never expose the race condition.
> From: st...@pearwood.info
> To: tutor@python.org
> Date: Sun, 12 Sep 2010 03:18:19 +1000
> Subject: Re: [Tutor] recursive problem
>
> On Fri, 10 Sep 2010 09:30:23 pm Ewald Horn wrote:
>
>> While EAFP is great, it's not
>> always the best way to proceed.
On Fri, 10 Sep 2010 09:30:23 pm Ewald Horn wrote:
> While EAFP is great, it's not
> always the best way to proceed.
That, at least, is correct. But what you say next is not:
> Sometimes you want programs to be
> very robust and secure, this is where LBYL comes in - it is quite
> often used in
> Date: Sat, 11 Sep 2010 11:05:54 -0400
> From: bgai...@gmail.com
> To: tutor@python.org
> Subject: Re: [Tutor] exceptions problem
>
> On 9/11/2010 6:56 AM, Peter Otten wrote:
>> Steven D'Aprano wrote:
>>
>>> On Sat, 11 Sep 2010 09:56:41 am bob gailer wro
On Sat, Sep 11, 2010 at 10:40 AM, Joel Goldstick
wrote:
>
> I think the first message in the original post is instructive:
>
> "I'm using the following function style I found on the net to create
> menus for a command line python script:"
>
> I (sometimes!) love looking at other peoples code to
On 09/11/10 23:25, Rance Hall wrote:
> On Fri, Sep 10, 2010 at 6:14 PM, Lie Ryan wrote:
>> On 09/11/10 07:36, Rance Hall wrote:
>
>
>
>> In most cases in Python, you would almost never need to reference the
>> list's index directly since python makes it easy to use iterators;
>> however in your
On Sat, Sep 11, 2010 at 11:15 AM, Steven D'Aprano wrote:
> On Sat, 11 Sep 2010 11:25:12 pm Rance Hall wrote:
>
> > Thanks everyone for responding, Because this menu structure is
> > repeated many times in my code, the ideal solution would have been to
> > "set index start = 1" in the beginning of
On Sat, 11 Sep 2010 11:25:12 pm Rance Hall wrote:
> Thanks everyone for responding, Because this menu structure is
> repeated many times in my code, the ideal solution would have been to
> "set index start = 1" in the beginning of the script.
That is exactly the wrong solution. That will break a
On 9/11/2010 6:56 AM, Peter Otten wrote:
Steven D'Aprano wrote:
On Sat, 11 Sep 2010 09:56:41 am bob gailer wrote:
I never thought that you can use a float and a integer to look if
the number is a integer.
You can't.
I made that comment in the context of the OPs function:
def readposint()
On Sat, Sep 11, 2010 at 02:25:24PM +0200, Evert Rol wrote:
>
> >> I'm not sure what you're exactly doing here, or what you're getting,
> >> but I did get curious and dug around urllib2.py. Apparently, there is
> >> a hardcoded 5 retries before the authentication really fails. So any
> >> stack t
Am 11.09.2010 15:46, schrieb Joel Goldstick:
On Sat, Sep 11, 2010 at 9:25 AM, Rance Hall mailto:ran...@gmail.com>> wrote:
On Fri, Sep 10, 2010 at 6:14 PM, Lie Ryan mailto:lie.1...@gmail.com>> wrote:
> On 09/11/10 07:36, Rance Hall wrote:
> In most cases in Python, you woul
On Sat, Sep 11, 2010 at 9:25 AM, Rance Hall wrote:
> On Fri, Sep 10, 2010 at 6:14 PM, Lie Ryan wrote:
> > On 09/11/10 07:36, Rance Hall wrote:
>
>
>
> > In most cases in Python, you would almost never need to reference the
> > list's index directly since python makes it easy to use iterators;
>
On Fri, Sep 10, 2010 at 6:14 PM, Lie Ryan wrote:
> On 09/11/10 07:36, Rance Hall wrote:
> In most cases in Python, you would almost never need to reference the
> list's index directly since python makes it easy to use iterators;
> however in your particular case, which is a valid exception, enu
>> I'm not sure what you're exactly doing here, or what you're getting,
>> but I did get curious and dug around urllib2.py. Apparently, there is
>> a hardcoded 5 retries before the authentication really fails. So any
>> stack trace would be the normal stack trace times 5. Not the 30 you
>> mentio
On Sat, Sep 11, 2010 at 01:09:31PM +0200, Evert Rol wrote:
> >>> My script to call a web service authenticates.
> >
> >> Sorry, but where is the (full) script? I missed an attachment or
> >> (preferably) a link.
> >
> > Hello,
> >
> > Sorry, the verb of the sentence is "authenticates," as i
On Sat, 11 Sep 2010 04:09:20 am goodh...@gmail.com wrote:
> I could not connect with gmail smtp server in Vista 32( worked ok
> in XP 32). Both vista and xp have same anti-virus software.
>
> >>> smtplib.SMTP("smtp.gmail.com",587)
>
> Traceback (most recent call last):
>File "", line 1, in
>
>>> My script to call a web service authenticates.
>
>> Sorry, but where is the (full) script? I missed an attachment or
>> (preferably) a link.
>
> Hello,
>
> Sorry, the verb of the sentence is "authenticates," as in, "My script
> ... authenticates."
Sorry, misread that.
Although code does
On Sat, 11 Sep 2010 06:54:39 am Rance Hall wrote:
> I will apologize for the tone and using the word "bug" without
> sufficient evidence, and I will be more thorough in the future.
Using the word "bug" itself isn't the problem. Nor is it that you made a
mistake -- we've all done that. A few days
On 10/09/2010 23.36, Rance Hall wrote:
I'm using the following function style I found on the net to create
menus for a command line python script:
def mainmenu():
# the main menu
todolist()
mainmenuoptions = ['Clients','Jobs','Billing','Quotes','To Do
Items','Employee','Exit']
Steven D'Aprano wrote:
> On Sat, 11 Sep 2010 09:56:41 am bob gailer wrote:
>> > I never thought that you can use a float and a integer to look if
>> > the number is a integer.
>>
>> You can't.
>
> What? Of course you can.
>
> def is_integer(x):
> """Return True if x is an integer."""
> t
On Sat, 11 Sep 2010 09:56:41 am bob gailer wrote:
> > I never thought that you can use a float and a integer to look if
> > the number is a integer.
>
> You can't.
What? Of course you can.
def is_integer(x):
"""Return True if x is an integer."""
try:
return 1.0*x == int(x)
exc
On Sat, 11 Sep 2010 12:35:48 am Huy Ton That wrote:
> I am reading the decorator section within Expert Python Programming
> and I am very confused in the first example, of a method that was
> done before decorators. It reads:
>
> class WhatFor(object):
> def it(cls):
> print 'work with
On Sat, 11 Sep 2010 04:47:13 am Michael Powe wrote:
> No problem, I am working on getting this sorted out. The
> documentation seems to be written as reminder for people who already
> know how this stuff works, rather than as a clear explanation for
> anybody working with it.
That's because the
On Sat, Sep 11, 2010 at 01:28:26AM +0200, Evert Rol wrote:
> > My script to call a web service authenticates.
> Sorry, but where is the (full) script? I missed an attachment or (preferably)
> a link.
Hello,
Sorry, the verb of the sentence is "authenticates," as in, "My script
... authentica
On 11/09/2010 1.56, bob gailer wrote:
On 9/10/2010 2:48 PM, Roelof Wobben wrote:
Date: Fri, 10 Sep 2010 20:23:09 +0200
From: f...@libero.it
To: tutor@python.org
Subject: Re: [Tutor] exceptions problem
...
> ...
> Roelof
Francesco
Thank you.
I never thought that you can use a float and a int
Hi Karim,
it's difficult to comment as to me the problem is not quite clear.
But I try ;-)
You have a complex xml and need to read different data types. For each
type you have certain rules, how to extract them from the xml (docrules).
You could create a DocRule class, that do nothing but hol
On Sat, 11 Sep 2010 12:11:37 am Albert-Jan Roskam wrote:
> Inside my program I have to keep a list of all the image files that
> are scheduled for data entry.
Sounds like you need to keep a list of all the image files that are
scheduled for data entry then.
> The main purpose is to be able to
Am 10.09.2010 16:11, schrieb Albert-Jan Roskam:
Hi Jan,
Here's a screendump of my program: http://nl.tinypic.com/r/2qtlojc/7 .
This might make my description a little bit clearer. The beautiful
sunset will in reality be a dull, handwritten form. ;-)
Regarding the iterator pattern, I was referri
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