Simple Django Forms problem

Building a simple django app using GAE.   I have a form.  I simply want to take the form data and post it back to the web page as a string.

The problem is that the form doesn't seem to acknowledge my data types.  How do I access my form data on the Python post code?

The form displays fine.  When I enter click 'submit' I get the following error:

------------error--------------
Traceback (most recent call last):
  File "/cygdrive/c/Program Files/Google/google_appengine/google/appengine/ext/webapp/__init__.py", line 501, in __call__
    handler.post(*groups)
  File "/cygdrive/e/appname/test.py", line 154, in post
    results = "results: foo=" + form.foo + ", bar=" + form.bar
AttributeError: 'MyForm' object has no attribute 'foo'
------------end error--------------

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class MyForm(forms.Form):
  foo = forms.CharField(max_length=25)
  bar = forms.CharField(max_length=25)
 
class AppPage(BaseRequestHandler):
  def get(self):
    self.generate('mypage.html', {
      'page' : 'myPage',
      'myForm': MyForm()
    })
  def post(self):
    form=MyForm(data=self.request.POST)
    # I simply want the form data put into a string I can display.
    # The below line causes an error.
    # The app doesn't think that 'form' has a data element foo.
    # see class MyForm; it clearly has class foo
    # what's the problem here?
    results = "results: foo=" + form.foo + ", bar=" + form.bar
    self.generate('mypage.html', {
      'page' : 'myPage',
      'myForm': MyForm(),
      'results' : results
    })