def __init__(self, group_name=None, **kwargs):
if not group_name:<EOL><INDENT>ArgumentError("<STR_LIT>")<EOL><DEDENT>Action.__init__(self, usergroup=group_name, **kwargs)<EOL>
Create an Action for a user group identified either by name.
:param group_name: string, name of the group
:param kwargs: other key/value pairs for the action, such as requestID