Remove newlines after def

[saroad2]

TL;DR

There shouldn't be a newline right after def statement.

Describe the style change

Newlines are great. They help us organize our code and leave room for the coders and reviewers to breath.
However, too many newlines can make simple code gigantic and massive. This is unnecessary in a lot of cases.

I want to argue that having a newline right after def is redundant and Black should remove it

Examples in the current Black style

Right now Black won't change the following code:

def f():

    print("No newline above me!")

    print("There is a newline above me, and that's OK!")

Desired style

Black should change the code above to:

def f():
    print("No newline above me!")

    print("There is a newline above me, and that's OK!")

What about classes?

I think that the issue above is not relevant to classes.

A new line after a class definition makes sense to me, since there is no actual meaning for the methods definitions order.

The newline after class definition makes room for the reader to breath before diving in to each method of the class.

So, Black should not change the following code:

class MyClass:

    def the_newline_above_me_should_stay(self):
        print("Leave the newline alone!")

[JelleZijlstra]

Duplicate of #902.

For what it's worth I think this is a reasonable idea; feel free to submit a PR.