Describe the style change
If you have (...) = something, the LHS parenthesis, I think, should not be kept.
Examples in the current Black style
def a():
    return 1, 2, 3
(b) = a()[0]
(c, *_) = a() 
Desired style
def a():
    return 1, 2, 3
b = a()[0]
c, *_ = a()