Use complex instead of Vector2D

complex.py

# add
A = 2 + 3j
B = 4 + 5j
print(A + B)

# sub
A = 2 + 3j
B = 4 + 5j
print(A - B)

# dot
A = 1 + 0j
B = 0 + 1j
dot = (A.conjugate() * B).real
print(dot)

# dot 2
A = 2 + 3j
B = 4 + 5j
dot = (A.conjugate() * B).real
print(dot)

# length
A = 2 + 3j
B = 4 + 5j
print(abs(A))
print(abs(B))

# cross
A = 2 + 3j
B = 4 + 5j
cross = A.real * B.imag - A.imag * B.real
print(cross)

# declaration
x = 2
y = 3
A = complex(x, y)
print(A)