Question

attrubuI’m new to python but don’t know how to solve this:

import wx

class myclass(wx.Frame):

    def __init__(self,parent,id):
        wx.Frame.__init__(self,parent,id,'Frame',size=(300,200))
        panel=wx.Panel(self)

        button=wx.Button(panel,label="click me",size=(120,60))
        self.Bind(wx.EVT_BUTTON, self.clickbutton, button)

        value=1

    def clickbutton(self, event):
        if self.value == 1:
            print("success")

if __name__=='__main__':
    app=wx.PySimpleApp()
    frame=myclass(parent=None,id=-1)
    frame.Show()
    app.MainLoop()

When I click the button I receive this error: “AttributeError: ‘myclass’ object has no attribute ‘value'”. What am I doing wrong? / How do I import “value” into my “clickbutton”-function?

Edit:
OK, this one was solved. After that I wanted to modify it a little:

    self.dropdown=wx.Choice(panel,pos=(130,60))
    list = ['banana', 'apple', 'strawberry']
    self.dropdown.AppendItems(strings=list)

def clickbutton(self, event):
    if self.dropdown.GetStringSelection() == 'apple':
        print("success")

Actually this works…. but it took me a long time to figure out that I have to use “GetStringSelection()” in the last but one line. How can i display a list with possible attributes (like “GetStringSelection()”) for “wx.Choice” (and other wx-classes) ? Or does a good website for this exists?

Edit 2:
Thanks again!
And I have a last question (sorry for asking step by step):

dir(wx.Choice)

works, but I have a given code with an obejct called “VarDecl”. For this I get an error if I ask

dir(wx.VarDecl)

I’m lookin for an attribute like “HasChanged” for this VarDecl-object.

Traceback (most recent call last):
File [...]    
if self.theVariable.HasChanged():
AttributeError: 'VarDecl' object has no attribute 'HasChanged'

Edit3:
OK, I think it has nothing to do with “wx”, I think it comes from “re”. (or still “wx”? I’m confused)

Answer 1

Change value=1 to self.value = 1. The value you have now is a local variable, which is discarded upon exiting the constructor.

EDIT: As for your second question, the built-in function dir(object) will give you a list of names (including methods) in the scope of the given object.
More information available here

EDIT 2: The wxPython documentation may also be of use to you

EDIT 3: About the theVariable thing: Have you tried dir(self.theVariable)?