""" Exercise ....

Create a class of objects of type "train" ...

1. 3 carriages, 120 per carriage, to London,
                leaves at 07:40, operated by Henry
2. 5 carriages, 65 per carriage, to Edinburgh,
                leaves at 07:45, operated by Gordon
3. 2 carriages, 100 per carriage, to Bicester,
                leaves at 07:50, operated by Thomas

Put those objects into a dictionary, keyed by the operating engine (don't have the operator in the object).
Output the time, length and capacities of each, and then do the same again this time sorted by capacity. """

class train (object):
        def __init__(self,c,cap,t,d):
                self.cars = c
                self.cap = cap
                self.t = t
                self.d = d
        def getcarriages(self):
                return self.cars
        def getcapa(self):
                return self.cap
        def getdest(self):
                return self.d
        def getbums(self):
                return self.cars * self.cap
        def __str__(self):
                return "The train to " + self.d

def bypeeps(dis,dat):
        return services[dat].getbums() - services[dis].getbums()

services = {"Henry" : train(3,120,"07:40","London"),
        "Gordon" : train(5,65,"07:45","Edinburgh"),
        "Thomas" : train(2,100,"07:50","Bicester")}

try:
        trips = services.keys()
        trips.sort(bypeeps) # Throws exception in Python 3!
except:
        trips = list(services.keys())
        trips.sort(key=lambda x:services[x].getbums())

for engine in trips:
        a = services[engine].getcarriages()
        b = services[engine].getcapa()
        d = services[engine].getbums()
        print(("{} "*5).format(a,b,d,engine,services[engine]))

""" Sample Answer

WomanWithCat:y107 grahamellis$ python2 nx
3 120 360 Henry The train to London
5 65 325 Gordon The train to Edinburgh
2 100 200 Thomas The train to Bicester
WomanWithCat:y107 grahamellis$ python3 nx
2 100 200 Thomas The train to Bicester
5 65 325 Gordon The train to Edinburgh
3 120 360 Henry The train to London
WomanWithCat:y107 grahamellis$

"""