python @ syntax for __matmul__ method

In [15]: class A:
    ...:     def __matmul__(self,b):
    ...:         print(self, b)
    ...:

In [16]: a = A()

In [17]: a @ a
<__main__.A object at 0x7f6bd0e44780> <__main__.A object at 0x7f6bd0e44780>