test/store-python/shopping-cart.py

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#  to you under the Apache License, Version 2.0 (the
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#  
#    http://www.apache.org/licenses/LICENSE-2.0
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#  under the License.

# Shopping cart implementation
import uuid
import sys

cartId = "1234"

# Get the shopping cart from the cache
# Return an empty cart if not found
def getcart(id, cache):
    cart = cache("get", (id,))
    if cart is None:
        return ()
    return cart

# Post a new item to the cart, create a new cart if necessary
def post(collection, item, cache):
    id = str(uuid.uuid1())
    cart = ((item[0], id, item[2]),) + getcart(cartId, cache)
    cache("put", (cartId,), cart)
    return (id,)


# Find an item in the cart
def find(id, cart):
    if cart == ():
        return ("Item", "0", ())
    elif id == cart[0][1]:
        return cart[0]
    else:
        return find(id, cart[1:])

# Get items from the cart
def get(id, cache):
    if id == ():
        return ("Your Cart", cartId) + getcart(cartId, cache)
    return find(id[0], getcart(cartId, cache))

# Delete items from the  cart
def delete(id, cache):
    if id == ():
        return cache("delete", (cartId,))
    return true

# Return the price of an item
def price(item):
    return float(filter(lambda x: x[0] == "'price", item[2])[0][1])

# Sum the prices of a list of items
def sum(items):
    if items == ():
        return 0
    return price(items[0]) + sum(items[1:])

# Return the total price of the items in the cart
def gettotal(cache):
    cart = getcart(cartId, cache)
    return sum(cart)

# TODO remove these JSON-RPC specific functions
def listMethods(cache):
    return ("Service.gettotal",)