human
I wrote the below code

    marker_re = re.compile(marker)
    def process(app, what_, name, obj, options, lines):
        if (what and (what_ not in what)):
            return
        deleted = 0
        delete = (not exclude)
        orig_lines = lines[:]
        for (i, line) in enumerate(orig_lines):
            if delete:
                lines.pop((i - deleted))
                deleted += 1
            if marker_re.match(line):
                delete = (not delete)
                if delete:
                    lines.pop((i - deleted))
                    deleted += 1
        if ((not lines) and (not keepempty)):
            lines[:] = orig_lines
        if (lines and lines[(-1)]):
            lines.append('')
    return process

What's a good function header?
 Here's a good function header?
assistant
#Here's a good function header.

def between(marker, what=None, keepempty=False, exclude=False):