I'm getting typeerror in python don't know why ?

Question

Code:
class Calculator:
def Add(a, b):
return a+b
def Sub(a, b):
return a-b
def Mul(a, b):
return a*b
def Div(a, b):
return a/b

C1=Calculator()
Ans=C1.Add(2, 3)
print("Addition ="+Ans)
Ans=C1.Sub(3, 2)
print("Subtraction ="+Ans)
Ans=C1.Mul(2, 3)
print("Multiplication ="+Ans)
Ans=C1.Div(4, 2)
print("division ="+Ans)

Error:
Traceback (most recent call last):
File "./Playground/file0.py", line 12, in <module>
Ans=C1.Add(2, 3)
TypeError: Add() takes 2 positional arguments but 3 were given

What am I doing wrong?

Answer 1

Abhishek Shelar ,

2 issues:

> the functions in class `Calculator` all requires `self` as first parameter.

> `Ans` is a numerical value (int or float), so we can not concatenate it to the string of: `"Addition ="`.
better to use like this:
print("Addition =", Ans)

Answer 2

or you can define the methods as staticmethods:

class Calculator:
@staticmethod
def Add(a, b):
print('Addition =', a+b)
@staticmethod
def Sub(a, b):
print('Subtraction =', a-b)
@staticmethod
def Mul(a, b):
print('Multiplication =', a*b)
@staticmethod
def Div(a, b):
print('Division =', a/b)

C1 = Calculator
C1.Add(2, 3)
C1.Sub(3, 2)
C1.Mul(2, 3)
C1.Div(4, 2)

#or

Calculator.Add(2,3)
Calculator.Sub(3,2)

Answer 3

Thanks for the help my error is solved I knew about the self but I had no idea about the second one thanks Lothar