how do I pass values between classes?

[kath]

hi everyone.........

I have a task, I have fragmented the task into subtask. I have planned
to create a class to each subclass and one parent class to handle the
sub tasks. Each subclass are saved in seperate file and all my
subclasses and parent class are placed in the same folder.

The parent class is subclass of wx.Frame, and subclasses are subclass
of wx.Panel. Each subclass will create a GUI for each task..

ok.. here is problem

When a menu is selected in the parent class, im instantiating the child
class(i.e, Panel), which has textbox and two buttons. first button is
used to select a file, and second one I have planned to, read the file
and pass the values to parent class [B]OR[/B] pass the filepath to
parent to read and do rest of the work.

How do I do that?

Please tell me whether I am following a correct method, by fragmenting
task  into small task and assigning it to child class and saving it in
a separate file?.

ok, here is the Parent class
[code]
import wx
import client
"""My Parent class"""
class Parent(wx.Frame):
    def __init__(self, parent, id, title):
        wx.Frame.__init__(self, parent, id, title)

        menu=wx.Menu()
        menu.Append(5000, "File")
        menu.AppendSeparator()
        menu.Append(5001, "Exit")
        menubar=wx.MenuBar()
        menubar.Append(menu, "File")
        self.SetMenuBar(menubar)
        self.Bind(wx.EVT_MENU, self.OnFile,id=5000)
        self.Bind(wx.EVT_MENU, self.OnExit,id=5001)

    def OnFile(self, event):
        self.cl=client.Child(self, -1)

    def OnBrowse(self, event):
        dir=""
        d=x.FileDialog(self, "Choose an Excel file", self.dirname, "",
"*.xls", wx.OPEN)
        if d.ShowModal() == wx.ID_OK:
            self.filename=d.GetFilename()
            self.dirname=d.GetDirectory()
            self.filepath.SetValue(os.path.join(self.dirname,
self.filename))

    def OnUpload(self, event):
        pass

    def OnExit(self, event):
        self.Close()

class MyApp(wx.App):
    def OnInit(self):
        frame=Parent(None, -1, "Parent window")
        frame.Show(True)
        self.SetTopWindow(frame)
        return True

if __name__ == '__main__':
    app=MyApp(redirect=False)
    app.MainLoop()

[/code]

and Child class
[code]
import wx, os

"""My Child class"""

class Child(wx.Panel):
    def __init__(self, parent, id):
        wx.Panel.__init__(self, parent, id, size=(300,300))
        box=wx.BoxSizer(wx.HORIZONTAL)
        label=wx.StaticText(self, -1, "File Path:  ")

        self.text=wx.TextCtrl(self, -1)
        browse=wx.Button(self, -1,"Browse")
        upload=wx.Button(self, -1, "Upload")
        self.Bind(wx.EVT_BUTTON, self.OnBrowse, browse)
        self.Bind(wx.EVT_BUTTON, self.OnUpload, upload)
        box.Add(label)
        box.Add(self.text)
        box.Add(browse)

        mainbox=wx.BoxSizer(wx.VERTICAL)
        mainbox.Add(box)
        mainbox.Add(upload)

        self.SetSizer(mainbox)
        mainbox.Layout()
    def OnBrowse(self, event):
        self.dir=""
        d=wx.FileDialog(self, "Choose an Excel file", self.dir, "",
"*.xls", wx.OPEN)
        if d.ShowModal() == wx.ID_OK:
            self.filename=d.GetFilename()
            self.dir=d.GetDirectory()
            self.text.SetValue(os.path.join(self.dir, self.filename))

    def OnUpload(self, event):
        pass

class MyApp(wx.App):
    def OnInit(self):
        frame=wx.Frame(None, -1, "Child window")
        panel=Child(frame, -1)
        frame.Show(True)
        self.SetTopWindow(frame)
        return True

if __name__ == '__main__':
    app=MyApp()
    app.MainLoop()
[/code]

thank you,
regards,
kath.