init() takes from 1 to 3 positional arguments but 4 were given

debugcn Published at Dev

Hugh Craig

class GeometricObject:
    def __init__(self,color = 'green',filled='true'):
        self.__color=color
        self.__filled=filled
    def getColor(self):
        return self.__color
    def setColor(self,color):
        self.__color=color
    def isFilled(self):
        return self.__filled
    def setFilled(self,filled):
        self.__filled=filled
    def __str__(self):
        return "Color: " + self.__color + " Filled: " + str(self.__filled)

And this is the Triangle class:

   from GeometricObject import GeometricObject

   class Triangle(GeometricObject):
       def __int__(self,side1=1.0,side2=1.0,side3=1.0):
           super().__init__()
           self.__side1=side1
           self.__side2=side2
           self.__side3=side3

       def getPerimeter(self):
           return self.__side1 + self.__side2 + self.__side3

       def __str__(self):
           return super().__str__()+" side 1: "+str(self.__side1)+" side 2: "+str(self.__side2)+" side 3: "+str(self.__side3) 

       from triangle import Triangle
       from GeometricObject import GeometricObject

       def main():
           side1=int(input("Enter first side: "))
           side2=int(input("Enter second side: "))
           side3=int(input("Enter third side: "))
           t1=Triangle(side1,side2,side3)
           print(t1.getColor())
           print(t1.getPerimeter())
           print(t1.__str__())
       main()

The error is occuring when I create the triangle object t1 in the main function: init() takes from 1 to 3 positional arguments but 4 were given...

I know there is other posts on similar errors like this but a lot of them were if you provided not enough arguments and the one's that did provide too many arguments did not answer my question.

Steve P.

You need to change __int__ to __init__, and only pass super() self.

class Triangle(GeometricObject):
       def __init__(self,side1=1.0,side2=1.0,side3=1.0):
           #The correct alternative to below is: 
           #super(GeometricObject, self).__init__()

           GeometricObject.__init__(self) 
           self.__side1=side1
           self.__side2=side2
           self.__side3=side3

To answer your second question, here's an example:

class A(object):
    def __init__(self, color = 'blue'):
        self.color = color

    def __str__(self):
        return str(self.color)

class B(A):
    def __init__(self, name = 'steve'):
        A.__init__(self)    
        self.name = name

    def __str__(self):
        #alternatively: return super(B, self).__str__() + " " + str(self.name) 
        return A.__str__(self) + " " + str(self.name)

prints "blue steve"

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