236 – at (@) operator

Python supports the operator at (@), although it doesn’t have any built-in behaviour. To add at (@) support to your own objects, implement __matmul__:

class Slime:
    def __init__(self, size):
        self.size = size

    def __matmul__(self, other):
        print("Combining slimes!")
        s = Slime(self.size + other.size)
        return s

s1 = Slime(10)
s2 = Slime(8)

slime = s1 @ s2   # Combining slimes!
print(slime.size) # 18

Since the at (@) operator is a binary arithmetic operator, you may also implement __rmatmul__ (and __imatmul__) to fully specify its behaviour.

Further reading:

• Overloading arithmetic operators with dunder methods, https://mathspp.com/blog/pydonts/overloading-arithmetic-operators-with-dunder-methods