human
Here's a good function header given the following:
I wrote the below code

    properties = []
    args = (args or [])
    def extract_line(line):
        '\n                                Extract    a    property    name,    value    and    the    qualifiers    from    a    fixture    line.\n\n                                Return    (property    name,    property    value,    property    qualifiers)\n                                '
        property_counter_type = ''
        try:
            (property_name, property_value, property_counter_type) = line.split('    ')
        except ValueError:
            (property_name, property_value) = line.split('    ')
        property_qualifiers = ([Mock(Name='CounterType', Value=int(property_counter_type))] if property_counter_type else [])
        return (property_name, property_value, property_qualifiers)
    data = Fixtures.read_file(f)
    for l in data.splitlines():
        (property_name, property_value, property_qualifiers) = extract_line(l)
        properties.append(Mock(Name=property_name, Value=property_value, Qualifiers_=property_qualifiers))
    args = (args if isinstance(args, list) else [args])
    for arg in args:
        (property_name, property_value) = arg
        properties.append(Mock(Name=property_name, Value=property_value, Qualifiers_=[]))
    return [Mock(Properties_=properties)]

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

def load_fixture(f, args=None):