Carl Banks wrote:
> You can have __add__ return a closure for the first addition, then
> perform the operation on the second one. Example (untested):
>
> class Closure(object):
> def __init__(self,t1,t2):
> self.t1 = t1
> self.t2 = t2
> def __add__(self,t3):
> #
Just for the hell of it ...
I can easily define __plus__() with three parameters. If the last one is
optional the + operation works as expected. Is there a way to pass the
third argument to "+"
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Steve Holden wrote:
>> y = s1*2 + s2(align=10)
>>
>> which should iterate as
>>
>> Time=1,'a'
>> Time=2,'a'
>> Time=10,'b'
>>
>> I have no difficulty passing "align" to the object (using __call__)
>> and use it while I furnish my own __iter__() method. However I don't
>> quite see how I can do
Christian Heimes wrote:
> If you *really* need to overwrite __iter__ on your instance rather
> than defining it on your class, you need to proxy the method call:
>
> class MyObject(object):
>def __iter__(self):
> return self.myiter()
>
> obj = MyObject()
> obj.myiter = myiter
>
> Tha
Steven D'Aprano wrote:
> If you want iterator operations "similar to itertools", why does this
> mean you need to replace anything? Just create your own iterators.
>
> Or use pre-processing and post-processing to get what you want.
>
> Can you show an example of what you would like to happen?
S
Hello all
When I create an Object and set its __iter__ method from outside
s = Sequence #one of my own classes
s.__iter__ = new.instancemethod(f,s,Sequence)
I get different results, depending on whether I call
for x in y.__iter__():
print x
or
for x in y:
print x
The first case does
Terry Reedy wrote:
> On 1/22/2010 2:29 PM, Martin Drautzburg wrote:
>> This has probably been asekd a million times, but if someone could
>> give a short answer anyways I's be most grateful.
>>
>> What is it that allows one to write A.x? If I have a variable A,
Martin Drautzburg wrote:
>> with scope():
>> # ...
>> # use up, down, left, right here
>>
>> # up, down, left, right no longer defined after the with block exits.
Just looked it up again. It's a cool thing. Too bad my locals() hack
would still be
This has probably been asekd a million times, but if someone could give
a short answer anyways I's be most grateful.
What is it that allows one to write A.x? If I have a variable A, then
what to I have to assign to it to A.x becomes valid?
Or even further: what do I have to do so I can write A.x=
Mark Dickinson wrote:
> On Jan 21, 10:57 pm, Martin Drautzburg
> wrote:
>> Here is a complete expample using a decorator, still a bit noisy
>>
>> def move(aDirection):
>> print "moving " + aDirection
>>
>> #Here comes the decorator
>> def
On 22 Jan., 11:56, Roald de Vries wrote:
> Hi Martin,
>
> On Jan 21, 2010, at 8:43 AM, Martin Drautzburg wrote:
>
>
>
>
>
> > Hello all,
>
> > When passing parameters to a function, you sometimes need a paramter
> > which can only assume certain
Carl Banks wrote:
> I see. Well, Python is a poor choice for defining an internal DSL
> (i.e., DSL using the general language's syntax), because it's
> (deliberately) rigid in both grammar and semantics.
I had this impression too.
> Paul McGuire should be by to recommend PyParsing shortly.
Steven D'Aprano wrote:
> I think this really is the correct solution for your problem. In
> Python, the standard place to have such public constants is at the
> module level, not the function or class. I think you're worrying
> unnecessarily about "namespace pollution" -- the module namespace is
>
Here is a complete expample using a decorator, still a bit noisy
def move(aDirection):
print "moving " + aDirection
#Here comes the decorator
def scope(aDict):
def save(locals):
"""Set symbols in locals and remember their original state"""
setSymbols={}
unsetSymbol
Thanks for all the answers. Let me summarize
(1) I fail to see the relevance of
>>> def move( direction ):
... print( "move " + str( direction ) )
...
>>> move( "up" )
move up
not only in the context of my question. And I don't see an abuse of the
language either. Maybe this could pass as a
Hello all,
When passing parameters to a function, you sometimes need a paramter
which can only assume certain values, e.g.
def move (direction):
...
If direction can only be "up", "down", "left" or "right", you can solve
this by passing strings, but this is not quite to th
I am trying to cPickle/unpickle a C++ extension class with some private
data members. I wrote __getstate__() and __setstate__ in C++ (I have
to, due to the private data). Pickling writes the following file:
ccopy_reg
_reconstructor
p1
(cpyramid
MidiBytes
Peter Otten wrote:
def SQL(sql):
> ... print sql
> ...
a = SQL("module")
> module # that one was obvious
class A:
> ... b = SQL("class")
> ... def method(self, c=SQL("default arg")):
> ... d = SQL("method")
> ...
You are my hero. Indeed very cool!
--
http:/
George Sakkis wrote:
> Yes, there is: use an ORM to do the SQL generation for you. Check out
> SQLAlchemy, it will buy you much more than what you asked for.
Might look, though in general I don't like OR mappers much. Having SQL
generated feels as strange as having python code generated. Too much
Gabriel Genellina wrote:
> En Sun, 22 Apr 2007 12:47:10 -0300, Martin Drautzburg
> <[EMAIL PROTECTED]> escribió:
>
>> I was thinking that it would be nice if a web application could talk
>> to real objects. The client side does not need to know the internals
>>
Alex Martelli wrote:
> Martin Drautzburg <[EMAIL PROTECTED]> wrote:
>
>> > mydata = data( )
>> > mydata.foo = 'foo'
>> > mydata.bar = 'bar'
>> >
>> > print mydata.foo
>> > print mydata.bar
>>
Daniel Nogradi wrote:
>> > What if I want to create a datastructure that can be used in dot
>> > notation without having to create a class, i.e. because those
>> > objects have no behavior at all?
>>
>> A class inheriting from dict and implementing __getattr__ and
>> __setattr__ should do the tri
Peter Otten wrote:
> Martin Drautzburg wrote:
>
>> I would like to validate sql strings, which are spread all over the
>> code, i.e. I run ("prepare") them against a database to see if it
>> happy with the statements. Spelling errors in sql have been a major
>
> mydata = data( )
> mydata.foo = 'foo'
> mydata.bar = 'bar'
>
> print mydata.foo
> print mydata.bar
I am aware of all this.
Okay let me rephrase my question: is there a way of using dot notation
without having to create a class?
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Gabriel Genellina wrote:
> En Sun, 22 Apr 2007 08:07:27 -0300, Martin Drautzburg
> <[EMAIL PROTECTED]> escribió:
>
>> Is it possible to convert an object into a string that identifies the
>> object in a way, so it can later be looked up by this string.
>> Te
Is it possible to convert an object into a string that identifies the
object in a way, so it can later be looked up by this string.
Technically this should be possible, because things like
<__main__.Foo instance at 0xb7cfb6ac>
say everything about an object. But how can I look up the real object
azrael wrote:
> Some time ago I posted a question about the favourite IDE. I finally
> found it. WING IDE i the best I've ever seen for python.
Yes WingIde is cool but it is not free. A fairly good alternative is
the "pydev" plugin for eclipse.
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Tim Golden wrote:
> 2) Don't use XML if you don't need to.
I would call this advice a "golden rule" the violation of which has
caused serious pain in some of the projects I am working on.
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This may be pretty obvious for most of you:
When I have an object (an instance of a class "Foo") I can access
attributes via dot notation:
aFoo.bar
however when I have a dictionary
aDict = {"bar":"something"}
I have to write
aDict["bar"]
What if I want to create a da
I would like to validate sql strings, which are spread all over the
code, i.e. I run ("prepare") them against a database to see if it happy
with the statements. Spelling errors in sql have been a major pain for
me.
The statements will not be assembled from smaller pieces, but they will
not neccess
I am using repr() to pass arrays, dicts and combinations therof to
javascript as it already returns a valid javascript expression (a
string) right away. But for some reason it does not handle Umlaute
correctly and those characters finally appear as two strange characters
on the browser. I am using
Steve Holden wrote:
> Unfortunately the overhead of supporting distribution is way too high to
> want to invoke it between two objects living in the same process.
Well I was thinking along the lines of "object" and "proxy-object" where a
proxy object is a handle to a remote object. Sending a pro
Hello all,
I've seen various attempts to add distributed computing capabilities on top
of an existing language. For a true distributed system I would expect it to
be possible to instantiate objects of a remote class or to subclass a
remote class and other stuff like this. My impression is that tho
I have run across a weired problem: I am using a wxTreeCtrl with a
model for each tree node. The tree expands "lazily" and each time a
node is expanded, its children (Views) are completely rebuilt,
creating new IDs. The children register their respecive models using
two self written classes "Model"
HackingYodel <[EMAIL PROTECTED]> writes:
> Does any single language do a better job in
> Python's weaker areas? Would anyone care to suggest one to supplement
> Python.
My first real OO language was Smalltalk. But the existing Smalltalk
implementations all have some severe shortcomings. Either
Just for curiosity: does python use a mark-and-sweep garbage collector
or simple reference counting? In the latter case it would not garbage
collect circular references, right ?
For mark-and-sweep, I assume there must be a toplevel Object from
which all other objects can be accessed or they will b
Is there an elegant way for finding unsent methods as in Smalltalk ?
I am aware of the fact that due to pythons dynamic typing, no tool in
the world can find ALL unsent methods (same in Smalltalk). But finding
the most obvious ones would already be of some help.
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In the wx demoy TreeCtrl.py I find the following code, that should
have no effect but seems to be needed nevertheless.
class TestTreeCtrlPanel(wx.Panel):
def __init__(self, parent, log):
[...}
self.tree = MyTreeCtrl(self, tID, wx.DefaultPosition, ...
isz = (16,16)
Withing a module I can assign a value to a global var by assigning to
it in the outermost scope. Fine.
But how can I do this if the attribute name itself is kept in a
variable. Once the module is loaded I can access the module's
namespace no problem, but inside the module the dictionary is not yet
My wxPython program starts execution in mainFrame.py like this
[...]
class MainApp(wxApp):
def OnInit(self):
self.mainFrame = MainFrame(None)
self.mainFrame.Show()
self.SetTopWindow(self.mainFram
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