wxpython: can't even create a Panel

I'm using the sample code of the file 'simple.py' and trying to make a single window with a panel in it, but I keep getting an error. Here's my code: (I know I might need something else, like a Show() method for the panel, but the error stops on the first panel line anyway. I've tried a Layout() method but it didn't get that far).

import wx


class MyFrame(wx.Frame):

def __init__(self, parent, title):
wx.Frame.__init__(self, parent, -1, title)

panel = wx.Panel(self)

class MyApp(wx.App):

def OnInit(self):
frame = MyFrame(None, 'My Test Frame')
frame.Show(True)
return True


app = MyApp()
app.MainLoop()

-----------------------
And the error:

>>>

Traceback (most recent call last):
File "C:\Python24\myscripts\wx_tests\wxtest.py", line 4, in -toplevel-
class MyFrame(wx.Frame):
File "C:\Python24\myscripts\wx_tests\wxtest.py", line 9, in MyFrame
panel = wx.Panel(self)
NameError: name 'self' is not defined
>>>

------------------

And if it helps, here is the code I'm using as a guide. It has the same panel line, but obviously something about my code is different for the 'self' reference not to work:

#----------------------------------------------------------------------
# A very simple wxPython example. Just a wx.Frame, wx.Panel,
# wx.StaticText, wx.Button, and a wx.BoxSizer, but it shows the basic
# structure of any wxPython application.
#----------------------------------------------------------------------

import wx


class MyFrame(wx.Frame):
"""
This is MyFrame. It just shows a few controls on a wxPanel,
and has a simple menu.
"""
def __init__(self, parent, title):
wx.Frame.__init__(self, parent, -1, title,
pos=(150, 150), size=(350, 200))

# Create the menubar
menuBar = wx.MenuBar()

# and a menu
menu = wx.Menu()

# add an item to the menu, using \tKeyName automatically
# creates an accelerator, the third param is some help text
# that will show up in the statusbar
menu.Append(wx.ID_EXIT, "E&xit\tAlt-X", "Exit this simple sample")

# bind the menu event to an event handler
self.Bind(wx.EVT_MENU, self.OnTimeToClose, id=wx.ID_EXIT)

# and put the menu on the menubar
menuBar.Append(menu, "&File")
self.SetMenuBar(menuBar)

self.CreateStatusBar()


# Now create the Panel to put the other controls on.
panel = wx.Panel(self)

# and a few controls
text = wx.StaticText(panel, -1, "Hello World!")
text.SetFont(wx.Font(14, wx.SWISS, wx.NORMAL, wx.BOLD))
text.SetSize(text.GetBestSize())
btn = wx.Button(panel, -1, "Close")
funbtn = wx.Button(panel, -1, "Just for fun...")

# bind the button events to handlers
self.Bind(wx.EVT_BUTTON, self.OnTimeToClose, btn)
self.Bind(wx.EVT_BUTTON, self.OnFunButton, funbtn)

# Use a sizer to layout the controls, stacked vertically and with
# a 10 pixel border around each
sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(text, 0, wx.ALL, 10)
sizer.Add(btn, 0, wx.ALL, 10)
sizer.Add(funbtn, 0, wx.ALL, 10)
panel.SetSizer(sizer)
panel.Layout()


def OnTimeToClose(self, evt):
"""Event handler for the button click."""
print "See ya later!"
self.Close()

def OnFunButton(self, evt):
"""Event handler for the button click."""
print "Having fun yet?"


class MyApp(wx.App):
def OnInit(self):
frame = MyFrame(None, "Simple wxPython App")
self.SetTopWindow(frame)

print "Print statements go to this stdout window by default."

frame.Show(True)
return True

app = MyApp(redirect=True)
app.MainLoop()
.