Programming Forums > Script Programming > Python

poopman · Feb 19th, 2007, 1:42 PM

I've build a GUI script and I would like one of the buttons to perform an action that I have defined in the script and also quit the GUI interface. I can only figure out how to assign the button to do one or the other, but not both. Any advice? Thanks!

ptmcg · Feb 19th, 2007, 2:57 PM

You could create a class that implements __call__ that takes all of the methods and calls them in turn. Here's a version that returns all of the return values in a list, unless an exception is thrown, in which case None is returned.

-- Paul

(Toggle Plain Text)

class Multicall(object):
    def __init__(self,*args):
        # all methods must have same signature
        self.methods = args
    
    def __call__(self,*args):
        retList = [None]*len(self.methods)
        for i,m in enumerate(self.methods):
            try:
                retList[i] = m(*args)
            except:
                # change 'break' to 'continue' if you want all methods to run
                break  
        return retList

addOne = lambda x : x + 1
addTen = lambda x : x + 10
invert = lambda x : 1.0 / x
add100 = lambda x : x + 100
    
    
callAll = Multicall( addOne, addTen, invert, add100 )

print callAll( 5 )
print callAll( 0 )

"""
prints:

[6, 15, 0.20000000000000001, 105]
[1, 10, None, None]
"""

Arevos · Feb 19th, 2007, 3:35 PM

Quote:

Originally Posted by poopman

I've build a GUI script and I would like one of the buttons to perform an action that I have defined in the script and also quit the GUI interface. I can only figure out how to assign the button to do one or the other, but not both. Any advice? Thanks!

What GUI system are you using? There are a number of them available for Python, and the answer will depend upon your choice.

Quote:

Originally Posted by ptmcg

You could create a class that implements __call__ that takes all of the methods and calls them in turn. Here's a version that returns all of the return values in a list, unless an exception is thrown, in which case None is returned.

Uh, that doesn't really sound like the best solution to the problem, as ingenious as it is. Why do you need the return values? Presumably the callback function attached to the button requires no return value, so there's no need for that code. And you might as well keep the exceptions, as if the return value is discarded, you'd want them around if something goes wrong.

If you really want some manner of serial function caller, why not simply:

 python Syntax (Toggle Plain Text) 
def multicall(*funcs):
    def caller(*args):
        for func in funcs: func(*args)
    return caller
def multicall(*funcs):
    def caller(*args):
        for func in funcs: func(*args)
    return caller

However, it's probably just easier to create your own function.

Sane · Feb 19th, 2007, 6:19 PM

Yeah... ptmcg's response is definitely going overboard. Not to mention, most likely not even applicable under these circumstances

If it were wxWidgets, it would be as simple as this:

(Toggle Plain Text)

class MyFrame(wxFrame):
    
    ...

    def _event_okay(self, event=None):
        # processes task for okay button
        if event != None:
            event.skip()

    def _event_quit(self, event=None):
        # processes task for quit button
        if event != None:
            event.skip()

    def _event_other_button(self, event):
        # processes two tasks sequentially
        self._event_okay()
        self._event_quit()
        event.skip()

    ...

Unless I grossely misunderstand the concern?
...

ptmcg · Feb 20th, 2007, 9:17 AM

:beard: I guess my OO training from Smalltalk/C++/Java days is still showing, I instinctively jump to writing a class, especially since Python offers such nice built-in class impersonation features, such as classes as numerics (for operator overloading) or classes as callables.

After I posted that last note, it dawned on me that a simple closure (as Arevos so clearly showed) would do just as well. I think I'll revisit pyparsing one of these days and see how much "class overkill" can be winnowed out.

Fortunately, I *can* be trained...

poopman · Feb 26th, 2007, 1:09 PM

Sorry for the late reply. I am using Tkinter.

Feb 19th, 2007, 1:42 PM	#1
poopman Newbie Join Date: Feb 2007 Posts: 13 Rep Power: 0	Can a button perform two actions? I've build a GUI script and I would like one of the buttons to perform an action that I have defined in the script and also quit the GUI interface. I can only figure out how to assign the button to do one or the other, but not both. Any advice? Thanks!

Feb 19th, 2007, 2:57 PM	#2
ptmcg Newbie Join Date: Aug 2005 Location: Austin, TX Posts: 15 Rep Power: 0	You could create a class that implements __call__ that takes all of the methods and calls them in turn. Here's a version that returns all of the return values in a list, unless an exception is thrown, in which case None is returned. -- Paul (Toggle Plain Text) class Multicall(object): def __init__(self,args): # all methods must have same signature self.methods = args def __call__(self,args): retList = [None]len(self.methods) for i,m in enumerate(self.methods): try: retList[i] = m(args) except: # change 'break' to 'continue' if you want all methods to run break return retList addOne = lambda x : x + 1 addTen = lambda x : x + 10 invert = lambda x : 1.0 / x add100 = lambda x : x + 100 callAll = Multicall( addOne, addTen, invert, add100 ) print callAll( 5 ) print callAll( 0 ) """ prints: [6, 15, 0.20000000000000001, 105] [1, 10, None, None] """ class Multicall(object): def __init__(self,args): # all methods must have same signature self.methods = args def __call__(self,args): retList = [None]len(self.methods) for i,m in enumerate(self.methods): try: retList[i] = m(args) except: # change 'break' to 'continue' if you want all methods to run break return retList addOne = lambda x : x + 1 addTen = lambda x : x + 10 invert = lambda x : 1.0 / x add100 = lambda x : x + 100 callAll = Multicall( addOne, addTen, invert, add100 ) print callAll( 5 ) print callAll( 0 ) """ prints: [6, 15, 0.20000000000000001, 105] [1, 10, None, None] """

Feb 19th, 2007, 6:19 PM	#4
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,868 Rep Power: 5	Yeah... ptmcg's response is definitely going overboard. Not to mention, most likely not even applicable under these circumstances If it were wxWidgets, it would be as simple as this: (Toggle Plain Text) class MyFrame(wxFrame): ... def _event_okay(self, event=None): # processes task for okay button if event != None: event.skip() def _event_quit(self, event=None): # processes task for quit button if event != None: event.skip() def _event_other_button(self, event): # processes two tasks sequentially self._event_okay() self._event_quit() event.skip() ... class MyFrame(wxFrame): ... def _event_okay(self, event=None): # processes task for okay button if event != None: event.skip() def _event_quit(self, event=None): # processes task for quit button if event != None: event.skip() def _event_other_button(self, event): # processes two tasks sequentially self._event_okay() self._event_quit() event.skip() ... Unless I grossely misunderstand the concern? ... __________________ Waterloo's Canadian Computing Competition (CCC) - Stage 2 Problems, Solutions, and Test Data

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Feb 20th, 2007, 9:17 AM	#5
ptmcg Newbie Join Date: Aug 2005 Location: Austin, TX Posts: 15 Rep Power: 0	:beard: I guess my OO training from Smalltalk/C++/Java days is still showing, I instinctively jump to writing a class, especially since Python offers such nice built-in class impersonation features, such as classes as numerics (for operator overloading) or classes as callables. After I posted that last note, it dawned on me that a simple closure (as Arevos so clearly showed) would do just as well. I think I'll revisit pyparsing one of these days and see how much "class overkill" can be winnowed out. Fortunately, I can be trained...

Feb 26th, 2007, 1:09 PM	#6
poopman Newbie Join Date: Feb 2007 Posts: 13 Rep Power: 0	Sorry for the late reply. I am using Tkinter.

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Programming Forums > Script Programming > Python

Can a button perform two actions?