Python indentation in “empty lines”

Question

Which is preferred (\".\" indicating whitespace)?

A)

def foo():
    x = 1
    y = 2
....
    if True:
        bar()

B)

Answer 1

My experience in open-source development is that one should never leave whitespace inside blank lines. Also one should never leave trailing white-space.

It's a matter of coding etiquette.