def __init__(self, tag=None, namespace=None, attributes=None,
      children=None, text=None, *args, **kwargs):
    if namespace:
      self._qname = (namespace, tag) % '{%s}%s'
    else:
      self._qname = tag
    self.children = children or []
    self.attributes = attributes or {}
    self.text = text
dataset/ETHPy150Open CollabQ/CollabQ/vendor/atom/data.py/ExtensionElement.__init__/swapped operands of `%`