#Named constructors
#empty
from shipping import *
c7 = ShippingContainer.create_empty("YML")
c7
c7.contents

#iterable series 
from shipping import *
c8 = ShippingContainer.create_with_items("MAE", ['food', 'textiles', 'minerals'])
c8
c8.contents

#BIC codes
from shipping import *
c = ShippingContainer.create_empty('YML')
c.bic