wxpython passing information, pointers?

I'm trying to code up an application to help me keep track of my students. Basically a customized notebook/gradebook. I hacked something together last summer that worked for this past year, but I need something better.

I'm going to pull each students record from a database, display it on my main page and have elements clickable to open a frame so that I can edit it. I need to pass information between these two frames and I'm an idiot because I can't seem to figure out how to alter the examples I've come across showing lambdas and same-class information passing.

On my main window I have a StaticText that looks like this

self.q1a_lbl = wx.StaticText(id=wxID_MAINWINDOWQ1A_LBL, label=u'87%',
      name=u'q1a_lbl', parent=self.alg_panel, pos=wx.Point(115, 48),
      size=wx.Size(23, 17), style=0)
self.q1a_lbl.SetToolTipString(u'Date \n\nNotes')
self.q1a_lbl.Bind(wx.EVT_LEFT_UP, self.OnQ1a_lblLeftUp)

Then I have the function:

def OnQ1a_lblLeftUp(self, event):
    import quiz_notes
    quiz_notes.create(self).Show(True)

Which works graphically, but I'm not really doing anything other than opening a window when the text is clicked on. Then I have another Frame with

import wx

def create(parent):
return quiz_notes(parent)

[wxID_QUIZ_NOTES, wxID_QUIZ_NOTESCANCEL_BTN, wxID_QUIZ_NOTESDATEPICKERCTRL1, 
 wxID_QUIZ_NOTESENTER_BTN, wxID_QUIZ_NOTESPANEL1, wxID_QUIZ_NOTESTEXTCTRL1, 
] = [wx.NewId() for _init_ctrls in range(6)]

class quiz_notes(wx.Frame):
    def _init_ctrls(self, prnt):
...and so on

I would like to pass at least a couple of variables. Eventually, when I start integrating the database into it, I would just pass a tuple. Or a reference to it. In C I'd just use a pointer. Anyway, make changes and then go back to my main window. In short, whats the best way to work with data between these two classes?

回答1:

There are not pointers in Python, but there are mutable structures. You can share state between objects by handing the same state-object to multiple instances.

What that state-object should be depends entirely on what you're trying to do (I still have no idea). It could be anything mutable, a module, class, instance, dict or list.

In this example the shared state is a list in a global variable:

# a list is mutable
state = 'Hello World'.split()

class Class1:
    def hi(self):
        print ' '.join(state)
        # do something to the shared state
        state[0] = 'Bye'

class Class2:
    def hi(self):
        print ' '.join(state)

x = Class1()
y = Class2()
x.hi()
y.hi()

回答2:

Check out Mike Driscoll's blog post on using PubSub in wxPython.

It's using the included PubSub in wxPython - just be aware that it is a stand-alone library, and the latest version's API is different to the one included in wx (a better API, if I may say so)