pythoncard-devel Mailing List for PythonCard (Page 3)

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business as it spreads to the middle class house. Our next feature makes 
this all possible, and is bringing it to the world!
 
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Stock: APWL
Current Price: 0.083
Short Term Target: 0.27
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With the increased miniaturization of personal 
electronics devices current tools are reaching their 
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Nano Superlattice Technology Inc. is a nanotechnology 
company engaged in the coating of tools and components 
with nano structured PVD coatings for high-tech 
industries.
NSLT uses Superlattice technology to apply multi-layers 
of super-hard elemental coatings on an array of 
precision products to achieve a variety of physical 
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I'm not real happy with the additional if blocks for displayProperty 
and updateComponent and all the other attribute hacks used to 
interpret and write out resource files.
Ideally, the attribute type would be defined as part of the spec and 
we would query the spec to find out how to handle each property 
rather than having the resourceEditor and propertyEditor make guesses 
based on a predefined list of attribute names. For example, the 
Button spec (minus comment lines) looks like:
class ButtonSpec(widget.WidgetSpec):
 def __init__(self):
 events = list(ButtonEvents)
 attributes = {
 'label' : { 'presence' : 'optional', 'default':'Button' },
 'default':{'presence':'optional', 'default':0} }
 widget.WidgetSpec.__init__(self, 'Button', 'Widget', events, 
attributes )
This should probably be:
class ButtonSpec(widget.WidgetSpec):
 def __init__(self):
 events = list(ButtonEvents)
 attributes = {
 'label' : { 'type': types.StringType, 'presence' : 
'optional', 'default':'Button' },
 'default':{'type', types.BooleanType, 
'presence':'optional', 'default':False} }
 widget.WidgetSpec.__init__(self, 'Button', 'Widget', events, 
attributes )
Note that 'default' is really a boolean, but when we started 
PythonCard True and False were not available which is why we were 
using 0.
Adding a basic Python type doesn't completely solve the problem 
because you need to know what type of editor to use for a given 
attribute. We could provide an 'editor' item as part of the 
dictionary, but it might more efficient to simply define our own 
types which the property editor would then use to decide which editor 
to be used. For example in addition to types.ListType and 
types.DictionaryType which would use a TextArea for editing we might 
have:
class MultiTextType(types.StringType):
 pass
for 'userdata' and 'text' attributes. We would probably have 
PositionType, SizeType, FontType, ColorType, and other special 
classes to cover a variety of different editors.
Components are supposed to be self-describing and if we're able to 
add enough information to the spec so that the resourceEditor loses 
all special knowledge of the components that would be a big plus.
ka

I'm moving this discussion to the developer list until we have a 
solution...
On Sep 15, 2006, at 5:13 AM, Alex Tweedly wrote:
> Jussi Salmela wrote:
>
>> Hello all and particularly Alex Tweedly, I guess!
>>
>> I'm using Python 2.4.3, wxPython 2.3.0, PythonCard 0.8.2 and its
>> Resource Editor on Win XP SP2.
>>
>> 1. I have an ImageButton and a bunch of other components on my page.
>> 2. I enter
>> open
>> into the command field of the ImageButton component in the 
>> Property Editor.
>> 3. I click some other component(s) active and then click ImageButton
>> active again.
>> 4. The command field now contains
>> <type 'file'>
>> instead of the open I entered earlier.
>> 5. If I now run my program I get an error, so not only the display is
>> erroneous but also the resource file.
>> 6. If I retype open in the command field, save and run, everything 
>> works
>> as expected.
>>
>>
> Hmmmm - very interesting.
>
> 1. It's not unique to ImageButton - happens with any component.
> 2. It's (probably) not unique to the 'command' attribute - should 
> happen
> to some others, but I haven't tried too hard to see which ones it
> happens with.
>
> It's caused by the following snippet of code in
> modules/propertyEditor.py (and /multipropertyEditor,.py):
>
>> if propName not in ['label', 'stringSelection', 'text',
>> 'toolTip', 'userdata']:
>> try:
>> value = eval(value)
>> except:
>> pass
>
> I'm not 100% sure why this was wanted. It does let you do interesting
> things - e.g. you can enter a string such as
> 3+8
> and it will be evaluated to 11 for you. You can enter a string like
> [20+3*15, 17]
> and it will be evaluated (to [65,17]) for, say, the position 
> value. And
> various other more strange possibilities
> (e.g. enter self.position and you get the current co-ords 
> of the
> property editor window !!)
>
> But I'm not clear on what the *useful* purpose of this eval is.
>
> In any case, the two oddities I know about are 'open' and 'file'
> which both eval to <type 'file'> (though there may be others).
>
> Suggestions (please comment):
>
> 1. short term - just avoid either open or file as command names :-)
>
> 2. figure out an exhaustive list of strings which eval to something 
> they
> "shouldn't", and explicitly check for them (??)
>
> 3. decide that you never want to eval the user-entered value to 
> produce
> a Python type, so add a test something like
> if not isinstance(eval(value), types.TypeType) :
> before resetting the variable 'value', thus
> if propName not in ['label', 'stringSelection', 'text', 'toolTip',
> 'userdata']:
> try:
> if not isinstance(eval(value), types.TypeType) : 
> value =
> eval(value)
> except:
> pass
>
> 4. decide whether there is real purpose in doing an 'eval' here at 
> all,
> and if there is, limiting the use to those cases, somehow.
>
>
>
> -- 
> Alex Tweedly al...@tw... http://www.tweedly.net
The current strategy for the property editor uses a single text field 
where we expect the user to enter a value that is then turned into 
the appropriate type. Since a TextField or TextArea can only display 
a string, the if statement was simply checking whether the expected 
data in the text field should be a string and the eval is for 
converting strings to numbers, tuples, lists, dictionaries, etc. 
Obviously, that isn't very bullet-proof so we could do a couple of 
things to make this work better. As I look at the old code the other 
thing I've realized is just how much of it needs to be rewritten so 
there probably isn't a quick fix that will solve all the possible 
problems.
Since we don't want to try and convert string attributes to other 
types I've added a line to list all of the attributes that we don't 
want to attempt to convert. This may not be complete, but this is 
what I checked in:
 self.stringItems = self.popItems + ['alignment', 'command', 
'file', 'label', 'name', 'text', 'toolTip', 'userdata']
I updated displayProperty to use this new variable as well as an 
additional check for when the value might be None which should deal 
with 'command'.
 def displayProperty(self, wName, wClass, propName):
 self.components.wName.text = propName + ":"
 ##widget = self.components[wName]
 widget = self._comp[wName]
 if propName in self.stringItems or propName in self.checkItems:
 value = getattr(widget, propName)
 else:
 value = str(getattr(widget, propName))
...
 if value == None:
 self.components.wField.text = ''
 else:
 self.components.wField.text = value
updateComponent got a similar change, including breaking up the 
handling of items and indenting the value conversion so it isn't done 
except as part of the default conversion. I haven't done extensive 
testing, but given that this is a logic change, conversions that used 
to work may not work now. I'm also a bit wary of places where we 
might have had None that might be an empty string now. Either way, 
Alex will make similar changes to his property editor code and then 
we can simply bang on it prior to a 0.8.3 release.
 def updateComponent(self):
 wName, wClass = 
self.components.wComponentList.stringSelection.split(" : ")
 propName = self.components.wPropertyList.stringSelection
 if propName in self.checkItems:
 value = self.components.wChecked.checked
 elif propName in self.popItems:
 value = self.components.wPop.stringSelection
 elif propName == 'items':
 value = self.components.wTextArea.text
 # KEA 2006年09月15日
 # need better error handling
 try:
 value = eval(value)
 except:
 pass
 elif propName == 'userdata' or (wClass == 'TextArea' and 
propName == 'text'):
 value = self.components.wTextArea.text
 else:
 value = self.components.wField.text
 if propName not in self.stringItems:
 # KEA 2006年09月15日
 # need better error handling
 try:
 value = eval(value)
 except:
 pass
ka

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Dear Friends,
 I'm more lose in Python Card... I use a MultiColumnList component =
and I want format each column after create or in Python Layout Editor, =
but I don't know do these... My problem:
1- I have a MultiColumnList with 8 items - 2 items I want right =
alignment and the others left. How I do these ???
2- What the better utility for print reports under Python Card =
envirnment ?? Exist some document or page about that ???
Thank you Very Much,
Eng. Celio Franco - Gestor
Portal Nosso S=E3o Paulo
www.nossosaopaulo.com.br 

Dear Friends,
 I'm more lose in Python Card... I use a MultiColumnList component =
and I want format each column after create or in Python Layout Editor, =
but I don't know do these... My problem:
1- I have a MultiColumnList with 8 items - 2 items I want right =
alignment and the others left. How I do these ???
2- What the better utility for print reports under Python Card =
envirnment ?? Exist some document or page about that ???
Thank you Very Much,
Eng. Celio Franco - Gestor
Portal Nosso S=E3o Paulo
www.nossosaopaulo.com.br 

I'm moving my main Mac setup to the universal build of Python and 
wxPython. I'll keep around at least one Windows and Mac installation 
with Python 2.3.x but for the most part I won't be testing against 
2.3 unless we get some weird report. Since the universal build on the 
Mac goes into /usr/local/bin it should be possible to continue to 
test against the old version.
I'll go ahead and update the Mac install instructions to make use of 
the universal builds rather than the ones that ship with Panther and 
Tiger.
I don't think there is any reason we *NEED* to make use of Python 
2.4.x in the framework or tools, but I see no reason to keep folks 
from making use of 2.4 features in the samples if they want them. If 
you see something in 2.4 you think we really need in the framework or 
tools please bring it up so we can weigh the downsides of upping the 
version requirements.
http://docs.python.org/whatsnew/whatsnew24.html
ka

Hi, I've done a simple pythoncard app, a demo of dijkstra's algorithm:
http://codeshift.net/dijkstra
I had no prior experience with GUI applications in python, yet managed 
to do it in a day.
Pythoncard seemed very pythonic to me and I think it was the right choice.
Anyways, if you find that code useful as a pythoncard demo or sth., feel 
free to use it.
regards,
jure

Alex Tweedly wrote:
> I see in the resourceEditor a line like
> 
> if ['List', 'PasswordField', 'TextField', 
> 'TextArea', 'Calendar'].count(t):
> 
> Is there some subtle difference between that and
> if t in ['List', 'PasswordField', 'TextField', 
> 'TextArea', 'Calendar']:
> 
> or can I change them to something my mind can more easily read :-) ?
> 
 From the documentation [1];
count(x)
 Return the number of times x appears in the list.
So doing if sequence.count(value): also relies on the fact that zero is 
false and non-zero true in Python.
I'd suggest you change it to the 'in' syntax which is more idiomatic and 
easier for people like you and I to understand.
[1] http://docs.python.org/tut/node7.html#SECTION007100000000000000000
Regards,
Andy
-- 
--------------------------------------------------------------------------------
 From the desk of Andrew J Todd esq - http://www.halfcooked.com/

I see in the resourceEditor a line like
 if ['List', 'PasswordField', 'TextField', 
'TextArea', 'Calendar'].count(t):
Is there some subtle difference between that and
 if t in ['List', 'PasswordField', 'TextField', 
'TextArea', 'Calendar']:
or can I change them to something my mind can more easily read :-) ?
-- 
Alex Tweedly http://www.tweedly.net
-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.394 / Virus Database: 268.9.5/377 - Release Date: 27/06/2006

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On Saturday 03 Jun 2006 15:21, Phil Edwards wrote:
> Feel free to add this into the samples launcher if it looks like it would
> be useful.
Ignore that - I can check it into CVS myself if no-one has any objections. I'd 
assumed that the repository had been switched to SVN already and I haven't 
installed a Linux SVN client yet.
-- 
Regards
Phil Edwards
Brighton, UK

Hi All:
I've spent the last few days writing a PythonCard app that needed to integrate 
with the system tray on both Windows and Linux. It took me a lot of trawling 
round on the mailing list archives and Google to find all the information I 
needed to get it working.
I've attached a short (less than 7kbytes compressed) bit of sample code which 
illustrates the salient points of adding a system tray icon to a PythonCard 
app, with a little bit of help from a few lines of raw wxPython. Feel free to 
add this into the samples launcher if it looks like it would be useful.
-- 
Regards
Phil Edwards
Brighton, UK