human
I wrote the below code

    def _normalize(key, prefix=''):
        return normalize(key, prefix=prefix, width=width).encode(catalog.charset, 'backslashreplace')
    def _write(text):
        if isinstance(text, unicode):
            text = text.encode(catalog.charset)
        fileobj.write(text)
    def _write_comment(comment, prefix=''):
        if (width and (width > 0)):
            _width = width
        else:
            _width = 76
        for line in wraptext(comment, _width):
            _write(('#%s    %s\n' % (prefix, line.strip())))
    def _write_message(message, prefix=''):
        if isinstance(message.id, (list, tuple)):
            _write(('%smsgid    %s\n' % (prefix, _normalize(message.id[0], prefix))))
            _write(('%smsgid_plural    %s\n' % (prefix, _normalize(message.id[1], prefix))))
            for idx in range(catalog.num_plurals):
                try:
                    string = message.string[idx]
                except IndexError:
                    string = ''
                _write(('%smsgstr[%d]    %s\n' % (prefix, idx, _normalize(string, prefix))))
        else:
            _write(('%smsgid    %s\n' % (prefix, _normalize(message.id, prefix))))
            _write(('%smsgstr    %s\n' % (prefix, _normalize((message.string or ''), prefix))))
    messages = list(catalog)
    if sort_output:
        messages.sort()
    elif sort_by_file:
        messages.sort((lambda x, y: cmp(x.locations, y.locations)))
    for message in messages:
        if (not message.id):
            if omit_header:
                continue
            comment_header = catalog.header_comment
            if (width and (width > 0)):
                lines = []
                for line in comment_header.splitlines():
                    lines += wraptext(line, width=width, subsequent_indent='#    ')
                comment_header = (u'\n'.join(lines) + u'\n')
            _write(comment_header)
        for comment in message.user_comments:
            _write_comment(comment)
        for comment in message.auto_comments:
           ...

What's a good function header?

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

def write_po(fileobj, catalog, width=76, no_location=False, omit_header=False, sort_output=False, sort_by_file=False, ignore_obsolete=False, include_previous=False):