def __init__(self, engine=None, history=None):
assert (engine == None or IEngineCore.providedBy(engine))
self.engine = IEngineCore(engine)
if history is None:
self.history = FrontEndHistory(input_cache=[''])
else:
self.history = history
def __init__(self, shell=None, history=None):
self.shell = shell
if history is None:
self.history = FrontEndHistory(input_cache=[''])
else:
self.history = history
