How to create a tree control with child nodes having check boxes? I want the check boxes to be preferably on the left side of the nodes.

Care to elaborate... a lot? I mean it'd help if you mentioned what GUI module you're using, for a start.

We are using this code.We are unable to append check box corresponding to each node.
For example, I need check boxes for node named LINUX,FreeBSD etc and hencelikewise.

please see attachment.
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import wx

class MyFrame(wx.Frame):
    def __init__(self, parent, id, title):
        wx.Frame.__init__(self, parent, id, title, wx.DefaultPosition, wx.Size(450, 350))

        hbox = wx.BoxSizer(wx.HORIZONTAL)
        vbox = wx.BoxSizer(wx.VERTICAL)
        panel1 = wx.Panel(self, -1)
        panel2 = wx.Panel(self, -1)

        self.tree = wx.TreeCtrl(panel1, 1, wx.DefaultPosition, (-1,-1), wx.TR_HIDE_ROOT|wx.TR_HAS_BUTTONS)
        root = self.tree.AddRoot('Programmer')
        os = self.tree.AppendItem(root, 'Operating Systems')
        pl = self.tree.AppendItem(root, 'Programming Languages')
        tk = self.tree.AppendItem(root, 'Toolkits')
        self.tree.AppendItem(os, 'Linux')
        self.tree.AppendItem(os, 'FreeBSD')
        self.tree.AppendItem(os, 'OpenBSD')
        self.tree.AppendItem(os, 'NetBSD')
        self.tree.AppendItem(os, 'Solaris')
        cl = self.tree.AppendItem(pl, 'Compiled languages')
        sl = self.tree.AppendItem(pl, 'Scripting languages')
        self.tree.AppendItem(cl, 'Java')
        self.tree.AppendItem(cl, 'C++')
        self.tree.AppendItem(cl, 'C')
        self.tree.AppendItem(cl, 'Pascal')
        self.tree.AppendItem(sl, 'Python')
        self.tree.AppendItem(sl, 'Ruby')
        self.tree.AppendItem(sl, 'Tcl')
        self.tree.AppendItem(sl, 'PHP')
        self.tree.AppendItem(tk, 'Qt')
        self.tree.AppendItem(tk, 'MFC')
        self.tree.AppendItem(tk, 'wxPython')
        self.tree.AppendItem(tk, 'GTK+')
        self.tree.AppendItem(tk, 'Swing')
        self.tree.Bind(wx.EVT_TREE_SEL_CHANGED, self.OnSelChanged, id=1)
        self.display = wx.StaticText(panel2, -1, '',(10,10), style=wx.ALIGN_CENTRE)
        vbox.Add(self.tree, 1, wx.EXPAND)
        hbox.Add(panel1, 1, wx.EXPAND)
        hbox.Add(panel2, 1, wx.EXPAND)
        panel1.SetSizer(vbox)
        self.SetSizer(hbox)
        self.Centre()

    def OnSelChanged(self, event):
        item =  event.GetItem()
        self.display.SetLabel(self.tree.GetItemText(item))

class MyApp(wx.App):
    def OnInit(self):
        frame = MyFrame(None, -1, 'treectrl.py')
        frame.Show(True)
        self.SetTopWindow(frame)
        return True

app = MyApp(0)
app.MainLoop()

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Editors note: Please use the [code=python] and [/code] tag pair to enclose your python code.

Why not just create checkboxes, hide them, and then on the event of a tree node expansion, show the corresponding checkboxes?

Although I don't use wxPython, you should be able to use a dictionary to clean up the code. Something like this. Again I don't use this toolkit so it may require tuning.

import wx

class MyFrame(wx.Frame):
    def __init__(self, parent, id, title):
        wx.Frame.__init__(self, parent, id, title, wx.DefaultPosition, wx.Size(450, 350))

        hbox = wx.BoxSizer(wx.HORIZONTAL)
        vbox = wx.BoxSizer(wx.VERTICAL)
        panel1 = wx.Panel(self, -1)
        panel2 = wx.Panel(self, -1)

        self.tree = wx.TreeCtrl(panel1, 1, wx.DefaultPosition, (-1,-1), 
                                   wx.TR_HIDE_ROOT|wx.TR_HAS_BUTTONS)
        root = self.tree.AddRoot('Programmer')
        os = self.tree.AppendItem(root, 'Operating Systems')
        pl = self.tree.AppendItem(root, 'Programming Languages')
        tk = self.tree.AppendItem(root, 'Toolkits')

        root_dict = {}
        root_dict[os] = ('Linux',  'FreeBSD', 'OpenBSD', 'NetBSD', 'Solaris')
        root_dict[tk]  = ('Qt', 'MFC', 'wxPython', 'GTK+', 'Swing')
        for index in root_dict.keys():
           for item in root_dict[index]:
              self.tree.AppendItem(index, item)

        cl = self.tree.AppendItem(pl, 'Compiled languages')
        sl = self.tree.AppendItem(pl, 'Scripting languages')
        pl_dict = {}
        pl_dict[cl] = ('Java', 'C++', 'C', 'Pascal')
        pl_dict[sl]  = ('Python', 'Ruby', 'Tcl', 'PHP')
        for index in pl_dict.keys():
           for item in pl_dict[index]:
              self.tree.AppendItem(index, item)

        self.tree.Bind(wx.EVT_TREE_SEL_CHANGED, self.OnSelChanged, id=1)
        self.display = wx.StaticText(panel2, -1, '',(10,10), style=wx.ALIGN_CENTRE)
        vbox.Add(self.tree, 1, wx.EXPAND)
        hbox.Add(panel1, 1, wx.EXPAND)
        hbox.Add(panel2, 1, wx.EXPAND)
        panel1.SetSizer(vbox)
        self.SetSizer(hbox)
        self.Centre()

    def OnSelChanged(self, event):
        item =  event.GetItem()
        self.display.SetLabel(self.tree.GetItemText(item))

class MyApp(wx.App):
    def OnInit(self):
        frame = MyFrame(None, -1, 'treectrl.py')
        frame.Show(True)
        self.SetTopWindow(frame)
        return True

app = MyApp(0)
app.MainLoop()
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