def __init__(self, rank=1, doc=None, blurb=None):
Prop.__init__(self, doc=doc, blurb=blurb, coerce=coerce_array(rank))
self.rank = rank
def __init__(self,length,default=None,types=None, blurb=None,doc=None):
self.length = length
self.default = default or tuple([None for i in range(length)])
Prop.__init__(default=default,types=types,blurb=blurb,doc=doc)
def __init__(self, rank=1, doc=None, blurb=None):
Prop.__init__(self, doc=doc, blurb=blurb)
self.rank = rank
