#Template property getter
from shipping import *
c = ShippingContainer.create_empty('YML',length_ft=20)
c.volume_ft3

r = RefrigeratedShippingContainer.create_empty('YML',length_ft=20, celsius=-18.0)
r.volume_ft3


#Template property setter
from shipping import *
h = HeatedRefrigeratedShippingContainer.create_empty('YML', length_ft=40, celsius=-18.0)
h.celsius
h.celsius = -30
Traceback (most recent call last):
File "<console>", line 1, in <module>
h.celsius = -30
h.celsius = 5