def __init__(self, name, dom, cod, data=None, _dagger=False):
"""
"""
if not str(name):
raise ValueError(messages.empty_name(name))
self._name, self._dom, self._cod = name, dom, cod
self._boxes, self._dagger, self._data = [self], _dagger, data
Arrow.__init__(self, dom, cod, [self], _scan=False)
def __init__(self, name):
if not str(name):
raise ValueError(messages.empty_name(name))
self._name = name