human
I wrote the below code

    def keepGoing(newRoot, dataEscaper=dataEscaper, renderFactory=renderFactory, write=write):
        return _flattenElement(request, newRoot, write, slotData, renderFactory, dataEscaper)
    if isinstance(root, (bytes, unicode)):
        write(dataEscaper(root))
    elif isinstance(root, slot):
        slotValue = _getSlotValue(root.name, slotData, root.default)
        (yield keepGoing(slotValue))
    elif isinstance(root, CDATA):
        write('<![CDATA[')
        write(escapedCDATA(root.data))
        write(']]>')
    elif isinstance(root, Comment):
        write('<!--')
        write(escapedComment(root.data))
        write('-->')
    elif isinstance(root, Tag):
        slotData.append(root.slotData)
        if (root.render is not None):
            rendererName = root.render
            rootClone = root.clone(False)
            rootClone.render = None
            renderMethod = renderFactory.lookupRenderMethod(rendererName)
            result = renderMethod(request, rootClone)
            (yield keepGoing(result))
            slotData.pop()
            return
        if (not root.tagName):
            (yield keepGoing(root.children))
            return
        write('<')
        if isinstance(root.tagName, unicode):
            tagName = root.tagName.encode('ascii')
        else:
            tagName = root.tagName
        write(tagName)
        for (k, v) in iteritems(root.attributes):
            if isinstance(k, unicode):
                k = k.encode('ascii')
            write((('    ' + k) + '="'))
            (yield keepGoing(v, attributeEscapingDoneOutside, write=writeWithAttributeEscaping(write)))
            write('"')
        if (root.children or (nativeString(tagName) not in voidElements)):
            write('>')
            (yield keepGoing(root.children, escapeForContent))
            write((('</' + tagName) + '>'))
        else:
            write('    />')
    elif isinstance(root, (tuple, list, GeneratorType)):
        for element in root:
            (yield keepGoing(element))
    elif...

What's a good function header?

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

def _flattenElement(request, root, write, slotData, renderFactory, dataEscaper):