What's the difference between initializing class variables within the
class definition directly versus initializing them within the class's
__init__ method? Is there a reason, perhaps in certain situations, to
choose one over the other?
Thank you.
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http://mail.python.org/mailman/listinfo/pytho
Ah, you've brought me much clarity Diez, thank you. That would explain
some "bugs" I've been having...
Diez B. Roggisch wrote:
> [EMAIL PROTECTED] schrieb:
> > What's the difference between initializing class variables within the
> > class definition directly versus initializing them within the c
Wait a minute! It doesn't explain my bugs. I've got "class variables"
acting like instance variables. What's weirder is that this behavior
occurs on my computer (in both of my installed WinXP copies) but not on
my laptop (WinXP Pro).
See the following test:
class Boo:
jerk = "yes"
def ki
Fredrik Lundh wrote:
> [EMAIL PROTECTED] wrote:
>
> > At first, I thought that self.jerk was resolving to the class attribute
> > instead of creating a new variable (w/ a differing scope).
>
> When you access an instance attribute, Python first looks in the
> instance object, and then in the class
Thank you Dennis, this makes the behavior so much clearer to me. I see
now that when self.jerk = self.jerk + 1 is executed that even though
the names are identical, at this point I'm referring to two different
values (one which is being created in part from the other).
As for my laptop, I'm not r
Fredrik Lundh wrote:
> [EMAIL PROTECTED] wrote:
>
> > Any clue what's behind this behavior?
>
> a missing plus sign.
>
>
Thanks for the guess but not possible given the following:
class Boo:
jerk = 10
def killjerk(self):
counter = 3
while counter !=0:
counte
Oh wow, I wasn't expecting so much help. I really appreciate it. My
problem, however, has been solved. I uninstalled my ActiveState Python
distro on my laptop and installed the distro from python.org along with
Stan's Python Editor. I ran the same code I'd run before and guess
what? The behavior no
Fredrik Lundh wrote:
> [EMAIL PROTECTED] wrote:
>
> > Output from laptop comp.:
> >
> > 1
> > 10
> > 2
> > 10
> > 3
> > 10
>
> so how are you entering and running the code on your laptop ?
>
> what happens if you set the class attribute to 100 instead of 10 ?
>
>
You can see my other post which
Diez B. Roggisch wrote:
> > No need to be obnoxious. I do appreciate your efforts to help, but you
> > must admit, your last statement is a bit snide and certainly not
> > useful.
> > I'm telling you that the code runs differently on my laptop.
>
> It certainly doesn't. There is absolutely no ima
Great IDE! I love it. Two things that make me very happy:
1. Unlike PythonWin and Stan's Python Editor (SPE), PyScripter shows
not just methods but also attributes in the class browser. [I'll
mention that Eric3 also does this, but I don't use Eric3 much because
the editor component doesn't allow s
Jan Bijsterbosch wrote:
> Hello ago, Bernard,
>
> "ago" <[EMAIL PROTECTED]> schreef in bericht
> news:[EMAIL PROTECTED]
> >
> > Bernard Lebel wrote:
> >> Not me. I'll probably sound pedantic but
> >> - the editor text looks awful, changing the editor options had no effect
> >> at all
> >> - there
By the way, does anyone know if / how you can change the key bindings
in PythonWin? In PyScripter, I was quite pleased that the autocomplete
lets you make your selection by pressing enter (natural), yet in
PythonWin you have to press tab (unnatural). Thanks.
[EMAIL PROTECTED] wrote:
> Great IDE! I
Hello all. I want a ruby and a python module to be able to communicate
with each other, access classes, instances and the like. Is there a
bridge for this? I'm aware of rupy, but the documentation seems rather
inadequate for the uninitiated. Are there other libraries/bridges or
maybe a rupy tutoria
I'll check that out, thanks!
vasudevram wrote:
> [EMAIL PROTECTED] wrote:
> > Hello all. I want a ruby and a python module to be able to communicate
> > with each other, access classes, instances and the like. Is there a
> > bridge for this? I'm aware of rupy, but the documentation seems rather
>
Wait wait, what do I do exactly? Thanks Michel.
Michel Claveau wrote:
> Hi!
>
> For me, like PHP (message of 11h.35) :
>
> Only in Windows, I can call Ruby (more exactly Ruby-script) from
> Python.
> I can, also, call, from Python, Ruby-defined-functions, like a method
> of a Python-class.
>
> It'
Hi all. If I have an instance of class A, called say foo, and I need to
mix-in the functions and variables of another class (class B) to this
instance at runtime, how do I do it? In other words, I want to make foo
an instance of an anonymous and temporary class that inherits its
functionality from
This looks excellent bearophile, but I'm having trouble understanding
some things. Perhaps you can help wipe clean my ignorance. Firstly, I
thought __classes__ was a read-only attribute? Secondly, what is a
"dictproxy object" and why won't the following code work:
class Cat:
def meow(self):
Okay, while I'd still like to know the answer(s) to my earlier
question(s), I've mostly solved my problem thanks to bearophile and my
own learning. An example:
class Cat(object):
def __init__(self):
self.love = 0
def meow(self):
print "meow"
class Dog(object):
def bark(
Bruno Desthuilliers wrote:
> [EMAIL PROTECTED] wrote:
> (snip)
>
> > Two additional questions though: 1) is there a way for a function to
> > get a reference to its caller automatically (as in, without the caller
> > having to pass it in)?
>
> It's possible with sys._getframe() and a decorator - b
When I tried to update a class's __dict__, I got an error saying that
there is no 'update' attribute for dictproxy object. What is a
dictproxy object? I thought that __dict__ is always suppose to be a, no
kidding, dictionary? Hence there should indeed be an update method.
What's this proxy business
Fredrik Lundh wrote:
> [EMAIL PROTECTED] wrote:
>
> > When I tried to update a class's __dict__, I got an error saying that
> > there is no 'update' attribute for dictproxy object. What is a
> > dictproxy object?
>
> a CPython implementation detail, used to protect an internal data structure
> us
All right. Thanks for explaining that Maric.
Maric Michaud wrote:
> Le lundi 26 juin 2006 16:06, [EMAIL PROTECTED] a écrit :
> > Fredrik Lundh wrote:
> > > [EMAIL PROTECTED] wrote:
> > > > When I tried to update a class's __dict__, I got an error saying that
> > > > there is no 'update' attribute
Is there a method or attribute I can use to get a list of classes
defined or in-use within my python program? I tried using pyclbr and
readmodule but for reason that is dogslow. Thanks in advance
DigiO
--
http://mail.python.org/mailman/listinfo/python-list
What's the best way to search a string for a particular word and get a
booleen value indicating whether it exists in the string or not?
Thanks...
--
http://mail.python.org/mailman/listinfo/python-list
I thought I'd seen that somewhere! Thanks Tim. I was previously using
re.search(substring, targetstring).
Tim Chase wrote:
> > What's the best way to search a string for a particular word and get a
> > booleen value indicating whether it exists in the string or not?
>
> >>> substring = 'foo'
> >
And what if I want to search for an item in a tuple, is there a
similarly easy method?
Tim Chase wrote:
> > What's the best way to search a string for a particular word and get a
> > booleen value indicating whether it exists in the string or not?
>
> >>> substring = 'foo'
> >>> targetstring = '
Wow, more than I had asked for, thank you Tim!
I ended up doing this:
def isClass(object):
if 'classobj' in str(type(object)):
return 1
elif "'type'" in str(type(object)):
return 1
else:
return 0
def listClasses():
classes = []
for eachobj in globals().
How can an object replace itself using its own method? See the
following code:
class Mixin:
def mixin(object, *classes):
NewClass = type('Mixin', (object.__class__,) + classes, {})
newobj = NewClass()
newobj.__dict__.update(object.__dict__)
return newobj
def is
Thank you thank you!
Tim Williams wrote:
> On 26 Jun 2006 08:24:54 -0700, [EMAIL PROTECTED]
> <[EMAIL PROTECTED]> wrote:
> > And what if I want to search for an item in a tuple, is there a
> > similarly easy method?
> >
> > Tim Chase wrote:
> > > > What's the best way to search a string for a part
Maric Michaud wrote:
> Le lundi 26 juin 2006 17:57, [EMAIL PROTECTED] a écrit :
> > How can an object replace itself using its own method? See the
> > following code:
> >
> > class Mixin:
> > def mixin(object, *classes):
> > NewClass = type('Mixin', (object.__class__,) + classes, {})
>
Bruno Desthuilliers wrote:
> [EMAIL PROTECTED] wrote:
> > How can an object replace itself using its own method?
>
> AFAIK, It can't (but I can be wrong - some guru around ?).
>
> > ...
>
> FWIW:
> Python 2.4.3 (#1, Jun 3 2006, 17:26:11)
> [GCC 3.4.6 (Gentoo 3.4.6-r1, ssp-3.4.5-1.0, pie-8.7.9)] o
Bruno Desthuilliers wrote:
> [EMAIL PROTECTED] wrote:
> > Bruno Desthuilliers wrote:
> >
> >>[EMAIL PROTECTED] wrote:
> (snip)
>
> >>>and 2) what's the reason to use newstyle classes
> >>>versus the old?
> >>
> >>All this is explained on python.org (there's a menu entry for this in
> >>the documen
What are the reason one would get this error: TypeError: Cannot create
a consistent method resolution order (MRO) for bases object ??
I can provide the code if needed
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http://mail.python.org/mailman/listinfo/python-list
Maric Michaud wrote:
...
> > def MixInto(Class, Mixin):
> > if Mixin not in Class.__bases__:
> > Class.__bases__ += (Mixin,)
>
> This doesn't work in most cases (with new style classes), better recreat a
> type which inherit from Class and Mixin, or Class.__dict__ with
> Mixin.__dict__
Hint: If I change Dog and Bat to old-style classes, there's no problem,
everything works fine.
Okay, here's the code dump from my playground::
--
#!/usr/bin/env python
class Mixin:
def mixin(object, *classes):
NewClass = type('Mixin', (object._
Oh, I forgot the line that bombed, sorry:
line 52, in __main__
Bat.__bases__ += (Dog,)
TypeError: Cannot create a consistent method resolution
order (MRO) for bases object, Mixin, Dog
See my other post for the complete code and my relevant note about
new-style classes, thanks...
Terry Reedy
Bruno Desthuilliers wrote:
> [EMAIL PROTECTED] a écrit :
> > Bruno Desthuilliers wrote:
> (snip)
> >>
> >>Instead of exposing problems with your solution, you may want to expose
> >>the real use case ?
> >
> >
> > I'm working with a team that's doing social modeling, and for example,
> > I need to
Maric Michaud wrote:
> Le lundi 26 juin 2006 22:37, [EMAIL PROTECTED] a écrit :
> > Won't work because there will be employers that aren't workers.
> > And yes, only some workers will become employers, but also only some
> > employers will also be workers (at some point in program). Let me be
> >
Maric Michaud wrote:
> Le lundi 26 juin 2006 20:06, [EMAIL PROTECTED] a écrit :
> > What are the reason one would get this error: TypeError: Cannot create
> > a consistent method resolution order (MRO) for bases object ??
> >
> > I can provide the code if needed
> This is the python solution t
Bruno Desthuilliers wrote:
(snip)
> >
> > It is very important that both should maintain attribute values,
> > regardless of whether they take on new "roles".
>
> Seems obvious. But just a question, BTW: do workers and employers share
> the same attributes ? And if not, how do you intend to initia
What's the best way to traverse the web of inheritance? I want to take
a class and traverse its bases and then the bases' bases etc
looking for a particular class. What first came to mind was nested for
loops. However, I want to know if there's some pre-existing method for
doing this or if this
Fredrik Lundh wrote:
> [EMAIL PROTECTED] wrote:
>
> > I'm working with a team that's doing social modeling, and for example,
> > I need to model workers that at some point in the program may or may
> > not also become employers. Now, I want the workers to take on all
> > behaviors and attributes o
Point well taken, and indeed a brilliant solution. Thank you I V for
demonstrating so clearly.
I V wrote:
> On Mon, 26 Jun 2006 19:40:52 -0700, digitalorganics wrote:
> > A misuse of inheritance eh? Inheritance, like other language features,
> > is merely a tool. I happen to be usi
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