python - Object is not callable -

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why object not callable? know problem? code in main main.py:

def average_wind(dia):          wind_list=[]          area=klass.windpower(dia)          print(area)

and code in class:

class windpower(object):     def __init__(self,digit):         self.digit=digit      def calc_area(self,dia):         area=(dia**2*math.pi)/4         return area         windpower = windpower(10)

klass.windpower object of windpower class, can't instantiate again. think meant call calc_area method?

area = klass.windpower.calc_area(dia)

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