'Get a specific extension.
:rtype: :class:`Limits`'

def get(self, reserved=False, tenant_id=None):

    opts = {}
    if reserved:
        opts['reserved'] = 1
    if tenant_id:
        opts['tenant_id'] = tenant_id
    query_string = (('?%s' % parse.urlencode(opts)) if opts else '')
    return self._get(('/limits%s' % query_string), 'limits')
