ó ?úźWc@sedZddlZddlZd„Zd„Zd„Zd„ZedkradddgZid d6d d 6Z id d6dd 6d d 6Z id d6d d 6Z ej de ƒZ ej de ƒZej de ƒZe eegZidd6dd6dd 6dd!6dd"6dd#6ZejeeƒZdGeGHx.d$D]#ZdGeGdGeeeeƒGHq7WndS(%s° Here's the intended output of this script, once you fill it in: Welcome to shop1 fruit shop Welcome to shop2 fruit shop Welcome to shop3 fruit shop Orders: [('apples', 1.0), ('oranges', 3.0), ('limes', 2.0)] At gas price 1 the best route is: ['shop1', 'shop2', 'shop3'] At gas price 3 the best route is: ['shop1', 'shop3'] At gas price 5 the best route is: ['shop2'] At gas price -1 the best route is: ['shop2', 'shop1', 'shop3'] i˙˙˙˙Nc CsËg}t|jƒƒ}xR|D]J}g|D]}|jƒ^q,}|j||ƒr|t|ƒ7}qqWd\}} xK|D]C} |j|| |ƒ} |dksł| |kr€| | }} q€q€W| S(s orderList: List of (fruit, numPound) tuples fruitTown: A Town object gasCost: A number representing the cost of going one mile Returns a list of shops in the order that is the optimal route to take when buying the fruit in the orderList N(NN(t getAllSubsetstgetShopstgetNametallFruitsCarriedAtShopstgetAllPermutationstNonetgetPriceOfOrderOnRoute( t orderListt fruitTowntgasCosttpossibleRoutestsubsetstsubsettshoptnamestminCostt bestRoutetroutetcost((sshopAroundTown.pytshopAroundTowns   cCsP|s gSgt|dƒD]}|dg|^q}t|dƒ}||S(si lst: A list Returns the powerset of lst, i.e. a list of all the possible subsets of lst ii(R(tlsttrestt withFirstt withoutFirst((sshopAroundTown.pyR4s .cCs||s gSt|ƒdkr |Sg}xOtt|ƒƒD];}||}|| ||}|t|t|ƒƒ7}q9W|S(sG lst: A list Returns a list of all permutations of lst i(tlentranget prependToAllR(RtallPermutationstititemt withoutItem((sshopAroundTown.pyR?s cCsg|D]}|g|^qS(sŠ item: Any object lsts: A list of lists Returns a copy of lsts with item prepended to each list contained in lsts ((RtlstsR((sshopAroundTown.pyROst__main__tapplesgđ?torangesg@tlimesg@g@tshop1tshop2tshop3ithomeig@sOrders:iis At gas pricesthe best route is:(sapplesgđ?(sorangesg@(slimesg@(R'sshop1(R'sshop2(R'sshop3(sshop1sshop2(sshop1sshop3(sshop2sshop3(iiii˙˙˙˙(t__doc__R ttownRRRRt__name__torderstdir1tdir2tdir3t FruitShopR$R%R&tshopst distancestTownRtprice(((sshopAroundTown.pyts4