Question

I have defined a class

code.py

class test:
     def __init__(self.x,self.y):
       self.x = x
       self.y = y


    def sum(self):
      z = self.x + self.y
      return z

def main():
   x = test(1,2)
   valsum = x.sum()

I want the sum to be returned when the class is called not when the method id called?

How will I code it

Answer 1

Use a function for this:

def test(*args):
    return sum(args)

Or better, just use the builtin:

sum((1,2))

---

If you have good reason to want this, you can always wrap this stuff up in another function:

def testsum(a,b):
    t = test(a,b)
    return t.sum()

Or you can just do:

result = test(a,b).sum()

directly. This should be used sparingly though since it is inefficient …

---

Finally (as pointed out in the comments, you can do this if you override __new__, DON’T DO THIS)

class test(object):
    def __new__(cls,*args):
       return sum(*args)

print (test(1,2,3,4)) #10