human
Complete the below
def _DefaultValueConstructorForField(field):

    ''''Returns a function which returns a default value for a field.
    Args:
    field: FieldDescriptor object for this field.
    The returned function has one argument:
    message: Message instance containing this field, or a weakref proxy
    of same.
    That function in turn returns a default value for this field.  The default
    value may refer back to |message| via a weak reference.'
    '''

=====
Can you provide a the Python program you requested?
assistant
#Here is the Python program you requested.
    if (field.label == _FieldDescriptor.LABEL_REPEATED):
        if (field.has_default_value and (field.default_value != [])):
            raise ValueError(('Repeated    field    default    value    not    empty    list:    %s' % field.default_value))
        if (field.cpp_type == _FieldDescriptor.CPPTYPE_MESSAGE):
            message_type = field.message_type
            def MakeRepeatedMessageDefault(message):
                return containers.RepeatedCompositeFieldContainer(message._listener_for_children, field.message_type)
            return MakeRepeatedMessageDefault
        else:
            type_checker = type_checkers.GetTypeChecker(field)
            def MakeRepeatedScalarDefault(message):
                return containers.RepeatedScalarFieldContainer(message._listener_for_children, type_checker)
            return MakeRepeatedScalarDefault
    if (field.cpp_type == _FieldDescriptor.CPPTYPE_MESSAGE):
        message_type = field.message_type
        def MakeSubMessageDefault(message):
            result = message_type._concrete_class()
            result._SetListener(message._listener_for_children)
            return result
        return MakeSubMessageDefault
    def MakeScalarDefault(message):
        return field.default_value
    return MakeScalarDefault