PEP 8, why no spaces around '=' in keyword argument or a default parameter value?

Question

Why does PEP 8 recommend not having spaces around = in a keyword argument or a default parameter value?

Is this inconsistent with recommending spaces around every other

Answer 1

I guess that it is because a keyword argument is essentially different than a variable assignment.

For example, there is plenty of code like this:

kw1 = some_value
kw2 = some_value
kw3 = some_value
some_func(
    1,
    2,
    kw1=kw1,
    kw2=kw2,
    kw3=kw3)

As you see, it makes complete sense to assign a variable to a keyword argument named exactly the same, so it improves readability to see them without spaces. It is easier to recognize that we are using keyword arguments and not assigning a variable to itself.

Also, parameters tend to go in the same line whereas assignments usually are each one in their own line, so saving space is likely to be an important matter there.