Operating system: Linux CentOS 7
Python version: 3.6.6
Black version: 18.9b0
Does also happen on master: Yes (Example on master)

I have this code (line length is greater than allowed)

my_dict = {
    'a key in my dict': deformation_rupture_mean * constraint_rupture_mean / 100.0
}

So Black wrap the line, but without indent :

my_dict = {
    "a key in my dict": deformation_rupture_mean
    * constraint_rupture_mean
    / 100.0
}

I find this indent not very readable.

If I add paranthesis, I get the code below, nice formatted in my opinion.

my_dict = {
    "a key in my dict": (
        deformation_rupture_mean * constraint_rupture_mean / 100.0
    )
}

Should not Black add paranthesis in this case?