The docs for complex literals¹ could be improved to show that:

    -1j is interpreted as -complex(0.0, 1.0)
    giving a real component of -0.0
    and an imaginary component of -1.0

and that:

   0-1j  is interpreted as 0.0-complex(0.0, 1.0)
    giving a real component of 0.0
    and an imaginary component of -1.0

It is unfortunate the repr for complex numbers uses integers at all.  That hides what is going on.

¹ https://docs.python.org/3/reference/lexical_analysis.html#imaginary-literals