How to make an embedded python interpreter's local space share some variables with global space

I have written a command line widget in my pyside program. The structure is like this:

class CommandWidget(QWidget):
  def __init__(self, parent = None):
      super(CommandWidget, self).__init__(parent)
      self.buffer=PyInterp(self)
      self.buffer.initInterpreter(locals())
      self........

class PyInterp(QTextEdit):

u3000u3000u3000u3000class InteractiveInterpreter(code.InteractiveInterpreter):

    u3000u3000u3000u3000def __init__(self, locals):
        u3000u3000u3000u3000code.InteractiveInterpreter.__init__(self, locals)

    u3000u3000u3000u3000def runIt(self, command):
        u3000u3000u3000u3000code.InteractiveInterpreter.runsource(self, command)

u3000u3000u3000u3000def __init__(self,  parent = None):
    u3000u3000u3000u3000super(PyInterp,  self).__init__(parent)

I also have a mainwindow program ruing together with some other widgets. My question is how can i import some functions in other widget class in this interpreter, run the function and output the result to the global space. Or in other words, I want to share some variables between the local space of the interpreter and the global mainwindow space. How can I achieve that ?