On Mon, Jan 23, 2012 at 4:22 PM, Jonno <jonnojohn...@gmail.com> wrote: > > > On Mon, Jan 23, 2012 at 2:25 PM, Terry Reedy <tjre...@udel.edu> wrote: >> >> On 1/23/2012 2:44 PM, Jonno wrote: >>> >>> I have a pretty complicated bit of code that I'm trying to convert to >>> more clean OOP. >>> >>> Without getting too heavy into the details I have an object which I am >>> trying to make available inside another class. The reference to the >>> object is rather long and convoluted but what I find is that within my >>> class definition this works: >>> >>> class Class1: >>> def __init__(self): >>> >>> def method1(self): >>> foo.bar.object >>> >>> But this tells me "global name foo is not defined": >>> >>> class Class1: >>> def __init__(self): >>> foo.bar.object >>> >>> Obviously I want the object to be available throughout the class (I left >>> out the self.object = etc for simplicity). >> >> >> Perhaps you left out some relevant details. >> > I'm sure I did. Part of the reason I'm not posting the whole code is that > I'm trying to teach myself OOP as part of this process. I want to figure out > what is wrong as much as possible by myself. I really appreciate the > pointers and suggestions though. > >> >> >>> Any ideas why I can reference foo inside the method but not in __init__? >> >> >> References inside functions are resolved when the function is called. So >> purely from what you have presented above, it would seem that 'foo' is >> defined between the call to __init__ and a later call to method1. > > > I have a strong suspicion that this is what's happening. > > Method1 is called on a button push when MainLoop is running so obviously foo > (the main wx.App) exists by then. > I must have somehow be initializing Class1 before foo = MyApp() happens. > Is there a good reference on the order that things happen in python when a > single script is run? >
"foo = MyApp()" creates an instance of MyApp, initializes it, and then binds it to the name foo. If Class1 is being initialized in MyApp.__init__, then the MyApp instance hasn't finished being created yet so the name "foo" doesn't exist. > In the meantime here is my stripped down script (foo = app, bar = frame, > object = graph_panel). I'd welcome all suggestions to reorganize it. > > > > -- > http://mail.python.org/mailman/listinfo/python-list > -- http://mail.python.org/mailman/listinfo/python-list
