def shipping_optimization(order):
"""
finds the cheapest means of shipping an order
@arg order : a dictionary -- see example for details
@returns : a models.Order object -- see example for details
@raises : AssertionError
: Exception (generic with custom messages)
"""
# pull zipcode
zipcode = str(order['zip'])[:5]
try:
assert re.match(r'\d{5}', zipcode)
except AssertionError:
bad_zip = Order()
box = Box()
for item in order['items']:
# box.items.append(Item(**item))
if 'qty' in item:
qty = int(item['qty'])
del item['qty']
for _ in range(qty):
print item
box.items.append(Item(**item))
else:
box.items.append(Item(**item))
box.shipping_cost = 0
box.shipping_method = 'UPS Mail Innovations'
bad_zip.boxes.append(box)
return bad_zip
# pull items
items = order['items']
try:
assert isinstance(items, (list, tuple))
except AssertionError:
raise Exception("items is not an iterable structure / array")
# assert well formed items
for item in items:
# uid
try:
assert len(str(item['uid'])) > 0
except (KeyError, AssertionError):
raise Exception("malformed item - uid missing: '%s'" % str(item))
# weight
try:
assert item['weight'] > 0
assert item['weight'] <= 2400
except KeyError:
raise Exception("malformed item - weight missing: '%s'" % str(item))
except (ValueError, AssertionError):
raise Exception("malformed item - weight must be a positive number and less than 2400 oz: '%s'" % str(item))
# qty
if 'qty' in item:
try:
assert item['qty'] > 0
except (ValueError, AssertionError):
raise Exception("malformed item - if qty is used it must be > 0: '%s'" % str(item))
# short out system in # of items > 9 -- force ground in 1 box
num_items = 0
for item in items:
if 'qty' in item:
num_items += item['qty']
else:
num_items += 1
if num_items > 9:
shorted = Box()
for item in items:
try:
qty = item['qty']
del item['qty']
except KeyError:
qty = 1
for _ in xrange(qty):
shorted.items.append(Item(**item))
shorted.shipping_cost, shorted.shipping_method = get_irregular_box_price(zipcode, shorted.weight)
order = Order()
order.boxes.append(shorted)
return order
# build lists of items
regular_items = []
irregular_items = []
for item in items:
try:
qty = item['qty']
del item['qty']
except KeyError:
qty = 1
# loop over quantity to create Item objects
for _ in xrange(qty):
if 'force_ground' in item.keys():
if item['force_ground']:
irregular_items.append(Item(**item))
else:
regular_items.append(Item(**item))
else:
regular_items.append(Item(**item))
# get prices for irregular items
irregular_boxes = []
for item in irregular_items:
box = Box()
box.items.append(item)
box.shipping_cost, box.shipping_method = get_irregular_box_price(zipcode, box.weight)
box.shipping_cost += LABOR_COST + PACKAGING_COST
irregular_boxes.append(box)
# make orders of boxes of regular items
orders = []
for combination in partitions(regular_items):
order = Order()
for partition in combination:
box = Box()
box.items.extend(partition)
box.shipping_cost, box.shipping_method = get_regular_box_price(zipcode, box.weight)
box.shipping_cost += LABOR_COST + PACKAGING_COST
order.boxes.append(box)
orders.append(order)
# find cheapest order
cheapest = min(orders, key=lambda o: o.shipping_cost)
# add irregular boxes to order
cheapest.boxes.extend(irregular_boxes)
# return cheapest order
return cheapest
def optimize_shipping():
"""
"""
def make_combinations(items):
"""
makes all possible combinations to the length of the origin input
"""
def inner(items, r):
"""
recursively yields partitioned remainders of original partition lists
"""
items = set(items)
if not len(items):
yield ()
return
first = next(iter(items))
remainder = items.difference((first, ))
for combination in combinations(remainder, r-1):
first_subset = (first, ) + combination
for partition in inner(remainder.difference(combination), r):
yield (first_subset, ) + partition
def outter(items, r):
"""
combines partition lists
"""
items = set(items)
for i in range(len(items), -1, -r):
if i == 0:
for partition in inner(items, r):
yield partition
elif i != r:
for combination in combinations(items, i):
for partition in inner(items.difference(combination), r):
yield partition + (combination, )
# step through length of origin combination partitions to ensure full list
for i in range(1, len(items)):
gen = outter(items, i)
for row in gen:
yield row
# get posted json
data = json.loads(request.data)
# pull zipcode
zipcode = data['zip']
# create items
regular, irregular = [], []
for item in data['items']:
qty = item['qty']
del item['qty']
for __ in xrange(qty):
if 'is_irregular' in item:
if item['is_irregular']:
irregular.append(Item(**item))
else:
regular.append(Item(**item))
else:
regular.append(Item(**item))
# process irregular items
irregular_boxes = []
for item in irregular:
box = Box()
box.items.append(item)
cost = get_irregular_price(zipcode, box.weight)
box.shipping_method = 'UPS Ground'
box.shipping_cost = cost
irregular_boxes.append(box)
# process regular items
if len(regular):
if len(regular) == 1:
box = Box()
box.items.extend(regular)
method, cost = get_cheapest_option(zipcode, box.weight)
box.shipping_method = method
box.shipping_cost = cost
order = Order()
order.boxes.append(box)
# add irregular boxes to order
order.boxes.extend(irregular_boxes)
return str(order.to_json())
else: # create orders/bundles from items combinations
orders = []
for combination in make_combinations(regular): # full tuple of tuples of items. ex: ( (one,two), (three,) )
order = Order()
for grouping in combination: # tuple of items. ex (one,two) from above
box = Box()
# add items to the box
box.items.extend(grouping)
# get cheapest shipping option for this box
method, cost = get_cheapest_option(zipcode, box.weight)
box.shipping_method = method
box.shipping_cost = cost
# add box to order
order.boxes.append(box)
# add irregular boxes to order
order.boxes.extend(irregular_boxes)
# add order to list of all possible combinations
orders.append(order)
# get the cheapest order combination
cheapest = min(orders, key=lambda o: o.shipping_cost)
cheapest.shipping_cost = round(cheapest.shipping_cost, 2)
# respond
return str(cheapest.to_json())
# no regular items:
else:
order = Order()
order.boxes.extend(irregular_boxes)
return str(order.to_json())