[melbourne-pug] Simple syntactic error?

[g sobers]

G'day!

Following is a small PyS60 script. The error seems related to basic syntax -
"state" in keys() is not recognized although defined globally.

Would appreciate assistance.

=============================================
import appuifw, key_codes, e32, telephone
state = None

def keys(event):
   if event['keycode'] == key_codes.EKeyYes:
     appuifw.note(u"Doesn't Matter")
  elif (event['keycode'] == key_codes.EKeyYes) and (state ==
telephone.EStatusConnected):
     appuifw.note(u"Yes was pressed and call active")

def cb_calling(args):
   state = args[0]

def quit():
   app_lock.signal()

telephone.call_state(cb_calling)
canvas = appuifw.Canvas(event_callback = keys)
appuifw.app.body = canvas
appuifw.app.exit_key_handler = quit
app_lock = e32.Ao_lock()
app_lock.wait()
==============================================

Best,
wirefree
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