what does mean + + operator in python numpy

I’ve met following statement in python numpy library

Z = inputs @ self.weights[1:].T + + self.weights[0]

I don’t understand exactly what does it mean in this line of code

I’ve made researchtations and did not found proper explanation

>Solution :

There is no + + operator in Python. This is two separate operators, the unary positive operator and the binary sum operator. Observe:

>>> import dis
>>> dis.dis("x + + y")
  0           0 RESUME                   0

  1           2 LOAD_NAME                0 (x)
              4 LOAD_NAME                1 (y)
              6 CALL_INTRINSIC_1         5 (INTRINSIC_UNARY_POSITIVE)
              8 BINARY_OP                0 (+)
             12 RETURN_VALUE

Similar to the unary negative operator, -. e.g:

x = 10
y = -x
print(y) # -10

I suspect this is just a typo. Cases where unary + actually matters are extremely rare, and this doesn’t look like one of them. Particularly, unary + is not an absolute value operator – if the input is negative, the output will be negative too.