As an supplement to my previous post, please find hereunder a snippet
for my unsuccessful attempt (commented out snippet does not work):
def superTuple(*attribute_names):
nargs = len(attribute_names)
class T(tuple):
def __new__(cls, *args):
return tuple.__new__(cls, args)
class __metaclass__(type):
x=property(lambda self:0)
y=property(lambda self:1)
z=property(lambda self:2)
x=property(lambda self:self[0])
y=property(lambda self:self[1])
z=property(lambda self:self[2])
#for idx, attr_name in enumerate(attribute_names):
# print 'attr name',attr_name, idx
# setattr(T.__metaclass__,attr_name, property(lambda cls:idx))
#for idx, attr_name in enumerate(attribute_names):
# print 'attr name',attr_name
# setattr(T,attr_name, property(lambda self:self[idx]))
return T
if __name__ == '__main__':
Point=superTuple('x','y','z')
p=Point(4,7,9)
assert p.x==p[0]
assert p.y==p[1]
assert p.z==p[2]
assert Point.x==0
assert Point.y==1
assert Point.z==2
Alain
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