dear wxPerts,
After searching the archives, I am unable to find a clear explanation of the following.
given:
sizer = wxBoxSizer(wxVERTICAL)
why does
isinstance(sizer, wxSizer) fail,
while
isinstance(sizer, wxBoxSizer) passes?
I thought isinstance() was supposed to 'do the right thing' for derived classes...
Shi.
That inheritance hierarchy only exists in C++. In the Python wrapper
wxPython, it's a bit more convoluted. Use the source Luke! 
There
is not so much other documentation I'm afraid.
class wxSizer(wxSizerPtr):
class wxBoxSizerPtr(wxSizerPtr):
class wxBoxSizer(wxBoxSizerPtr):
isinstance(sizer, wxSizerPtr) should do what you want I guess...
At 13:23 2002-11-27 -0500, you wrote:
I thought isinstance() was supposed to 'do the right thing' for derived classes...
--
Magnus Lycka, Thinkware AB
Alvans vag 99, SE-907 50 UMEA, SWEDEN
phone: int+46 70 582 80 65, fax: int+46 70 612 80 65
http://www.thinkware.se/ mailto:magnus@thinkware.se
thanks, Magnus - that did the trick.. &:>
Shi.
Magnus Lycka wrote:
At 13:23 2002-11-27 -0500, you wrote:
>
>> I thought isinstance() was supposed to 'do the right thing' for
>> derived classes...
>
> That inheritance hierarchy only exists in C++. In the Python wrapper
> wxPython, it's a bit more convoluted. Use the source Luke! There
> is not so much other documentation I'm afraid.
>
> class wxSizer(wxSizerPtr):
>
> class wxBoxSizerPtr(wxSizerPtr):
>
> class wxBoxSizer(wxBoxSizerPtr):
>
> isinstance(sizer, wxSizerPtr) should do what you want I guess...
>
Shi Sherebrin wrote:
dear wxPerts,
After searching the archives, I am unable to find a clear explanation of the following.
given:
sizer = wxBoxSizer(wxVERTICAL)
why does
isinstance(sizer, wxSizer) fail,
while
isinstance(sizer, wxBoxSizer) passes?
I thought isinstance() was supposed to 'do the right thing' for derived classes...
It does, but there are some implementaiton classes that through things off a bit. wxBoxSizer's heirarchy is:
wxObjectPtr
\
\
wxSizerPtr
/ \
/ \
wxSizer wxBoxSizerPtr
\
\
wxBoxSizer
It's a pain but it's just the way this version of SWIG works.
--
Robin Dunn
Software Craftsman
http://wxPython.org Java give you jitters? Relax with wxPython!
Magnus Lycka wrote:
At 13:23 2002-11-27 -0500, you wrote:
I thought isinstance() was supposed to 'do the right thing' for derived classes...
That inheritance hierarchy only exists in C++. In the Python wrapper
wxPython, it's a bit more convoluted. Use the source Luke!
is not so much other documentation I'm afraid.class wxSizer(wxSizerPtr):
class wxBoxSizerPtr(wxSizerPtr):
class wxBoxSizer(wxBoxSizerPtr):
isinstance(sizer, wxSizerPtr) should do what you want I guess...
This would be better:
isinstance(b, (wxSizer, wxSizerPtr))
just in case I ever "fix" the code generator to use a more consistent (and sane) class heriarchy.
--
Robin Dunn
Software Craftsman
http://wxPython.org Java give you jitters? Relax with wxPython!
Robin Dunn wrote:
Magnus Lycka wrote:
...
isinstance(sizer, wxSizerPtr) should do what you want I guess...
This would be better:
isinstance(b, (wxSizer, wxSizerPtr))
just in case I ever "fix" the code generator to use a more consistent (and sane) class heriarchy.
Robin, was that supposed to be pseudocode, or will it only work in Python v2.2+? I'm using v2.1 and I get:
TypeError: isinstance() arg 2 must be a class or type
I also tried a list instead of a tuple and got the same result
I'm planning to do the following:
result_list = map(isinstance, [sizer, sizer], [wxSizer, wxSizerPtr])
result = filter(None, result_list)
assert(result)
but just wanted to check first to see if I was not 'getting' something..
thanks,
Shi.
Shi Sherebrin wrote:
Robin Dunn wrote:
Magnus Lycka wrote:
...
isinstance(sizer, wxSizerPtr) should do what you want I guess...
This would be better:
isinstance(b, (wxSizer, wxSizerPtr))
just in case I ever "fix" the code generator to use a more consistent (and sane) class heriarchy.
Robin, was that supposed to be pseudocode, or will it only work in Python v2.2+?
Yes, apparently.
--
Robin Dunn
Software Craftsman
http://wxPython.org Java give you jitters? Relax with wxPython!