[wxPython-users] parameter passing Question

[Christopher Barker]

Daniel Johnson wrote:
> ***************CODE BEGINS************************************
> class MyFrame1(wx.Frame):
>    def __init__(self, *args, **kwds):
>         .....
>         .....
>    def OnEdit(self, event):
>         sim_name = 'some_string'
>         win = MyFrame2(self, -1, "")
>         win.Show(True)

sim_name only exists at this point in the local namespace of the OnEdit 
method -- you can't get at it from anywhere else at all.

If you put it in self.sim_name, then it will live in the namespace of 
the instance of MyFrame1.

> class MyFrame2(wx.Frame):
>    def __init__(self, *args, **kwds):
>         .....
>         .....
>    def onLaunch(self, event):
>         ## This function needs to use the parameter sim_name which is in
> class MyFrame1-->OnEdit
> ***************CODE ENDS************************************
> 
> I want to pass sim_name parameter to MyFrame2 but I don't know how to do 
> it.

Where is your MyFrame2 getting created? Unless it's created in 
MyFrame1.OnEdit, which would be weird, you can't really just pass it in.

In general, it looks like you need to have some kind of class that holds 
various information your app is working with. I'm guess that sim_name 
isn't the only piece of data that you'll need to do this kind of thing with.

Then you need to be able to reference that data object from both Frame1 
and Frame2, and probably a lot of other places. There are a lot of way 
to do that. One of which is....
> I tried couple of things but always got some error. I have some parameter
> passing in normal Python code but *args and **kwds is a little confusing.

You could do something like:

class MyFrame2(wx.Frame):
     def __init__(self, MyData, *args, **kwds):

then you would create it like:

AFrame = MyFrame2(SomeData, parent, other, parameters, to, wx.Frame)

If wxGlade Doesn't like that, you can just set the MyData parameter 
after you create the object;

AFrame = MyFrame2(parent, other, parameters, to, wx.Frame)
AFrame.MyData = SomeData

You could also store this data in the wx.App object, in a module that 
you reference from anywhere you need it, etc, etc, etc.

Remember: Python is ALL about namespaces. Every Python object (a class, 
a module, an instance, etc, is really just a namespace)

-Chris

-- 
Christopher Barker, Ph.D.
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