Type Error: 'in' object is not callable

[nman52]

import statistics as s

class stats:
   
    def mode(self):
        self.mode = s.mode(self.value)
        return(self.mode)
    def median(self):
        self.median = s.median(self.value)
        return(self.median)
    def mean(self):
        self.mean = s.mean(self.value)
        return(self.mean)
    def __init__(self, value):
        self.value = value

if __name__ == "__main__":
        
        testval = [2,3,4,5,8,4,6,3,4,6,8,9,7,5,3,5,7,4,3,2,2,1,4,6,8,6,8,9,3]
        
        object1 = stats(testval)
        print(type(object1.mode()))
        print(type(object1.median))
        assert (object1.mode()) == 3
        assert (object1.median) == 5
        assert (object1.mean) == 5

Error:
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-20-1e939491cea4> in <module>
     22         print(type(object1.mode()))
     23         print(type(object1.median))
---> 24         assert (object1.mode()) == 3
     25         assert (object1.median) == 5
     26         assert (object1.mean) == 5

TypeError: 'int' object is not callable