Hi in a recent local programming contest there was a problem in which you had to define a class which takes chain-like parameters and returns their sum e.g. :
>>> Chain(2.5)(2)(2)(2.5) # sum
9
>>> Chain(3)(1.5)(2)(3) # sum
9.5
Best thing that I could write is this code:
class Chain():
value = 0
def __new__(self, num):
self.value += num
return self
obj = Chain(2)(3)
print(obj.value)
But the return type is a class not an int, furthermore I'm using a static property which is obviously wrong. Would appreciate any helps.
P.S. : Please note that that contest finished on January 7 2022 so I don't think there is any problem with posting this question.
You can inherit from float (as you need to support decimal numbers) and implement __call__ like so:
class Chain(float):
def __call__(self, value):
return self.__class__(self+value)
>>> Chain(3)(1.5)(2)(3) # sum
9.5
>>> Chain(2.5)(2)(2)(2.5) # sum
9.0