Another way, somewhat similar to lambdas but without those 'buggy'
behaviours, is to use a 'callback' object:
class Callback:
def __init__(self,func,*args,**kwargs):
self.func = func
self.args = args
self.kwargs = kwargs
def __call__(self,*args, **kwargs):
return self.func(*self.args, **self.kwargs)
def someDef(theList, someParameter):
....
cmds.button(command = Callback(someDef, someList, someParameter = 2))
(FYI - Pymel has a more robust version of this object which supports Undo:
from pymel import Callback)
On Wed, Jan 7, 2009 at 7:44 PM, Matthew Chapman <[email protected]>wrote:
> This is a common mistake, the way you have written this python will
> call 'someDef(someList)' and pass its results to named argument 'command'.
> There are a couple ways to get this to work the way you would like. My
> personal choice is this
>
> # Define a function that can take any named or unnamed arguments
> # the * tells python to put any unnamed arguments into a list
> # the ** tell python to put any names arguments into a dictionary
>
> def someDef( *args, **kwargs ):
> # call function or have inline code that creates someList
> someList = getSomeList()
> print someList
>
> def buildUI():
> # <insert all stuff that defines window>
>
> # create button and pass the function it self to the argument
> # command=someDef() # will pass the result where as
> # command=someDef # passes the actual function to the argument
>
>> cmds.button(command=someDef)
>
>
> If you really want to pass in data in the call as its being defined
> you should use a lambda. A lambda is an unamed function. I have heard of
> lambdas being buggy in certain instances because of how they are defined and
> stored in memory in modules like pyqt. Here is how you could write is.
>
> def buildUI():
> # ' ' ' ' ' ' ' ' ' ' ' \/
>
>> cmds.button(command=lambda *args : someDef(someList ))
>
>
> If you new the namespace of you function you could always pass it as a
> string to 'command'.
>
> def buildUI():
> # ' ' ' ' ' ' ' ' ' ' ' \/
>
>> cmds.button(command="myModule.someDef([%s] )" % str(someList))
>
>
>
>
> >
>
--
- Ofer
www.mrbroken.com
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Yours,
Maya-Python Club Team.
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