wxPython Fibonacci function

class FibonacciModel(ModelInterface):
    def Generate(self):
        cval = self.GetValue()
        # Get the next one
        for fib in self.fibonacci():
            if fib > cval:
                self.SetValue(fib)
                break

    #@staticmethod
    #def fibonacci():
    def fibonacci(self):
        """Fibonacci generator method"""
        a, b = 0, 1
        while 1:
            yield a
            a, b = b, a + b