Python 2 6 Class inside a Class

Question

Hey everyone  my problem is that im trying to figure out how to get a class INSIDE another class   What I am doing is I have a class for an Airplane with all its statistics as to how fast it can fly  how far it can go  fuel consumption  and so on  Then I have a Flight Class which is all the details about the flight  Distance  starting location and time  ending location and time  duration  and so on   But I realized that each airplane has multiple flights  so why not put all the flight data into the airplane class  Although how do i put a class INTO another class so i can call something like this   Player1 Airplane5 Flight6 duration   5 hours   Ive somewhat done it with the airplane class  but when i go to save the information  listing everything out into a text document   all it gives me is the Hex location of the data and not the actual strings   class Player  object   Player Class to define variables        Player class to define variables         def   init    self  stock   0  bank   200000  fuel   0  total flights   0  total pax   0           self stock   stock         self bank   bank         self fuel   fuel         self total flights   total flights         self total pax   total pax         self Airplanes   Airplanes         self flight list   flight list   Is there a way to put a class inside a class  or will i need to make one super Player class which handles all the information which im using other classes for

User · Accepted Answer

I think you are confusing objects and classes. A class inside a class looks like this:

class Foo(object):
    class Bar(object):
        pass

>>> foo = Foo()
>>> bar = Foo.Bar()

But it doesn't look to me like that's what you want. Perhaps you are after a simple containment hierarchy:

class Player(object):
    def __init__(self, ... airplanes ...) # airplanes is a list of Airplane objects
        ...
        self.airplanes = airplanes
        ...

class Airplane(object):
    def __init__(self, ... flights ...) # flights is a list of Flight objects
        ...
        self.flights = flights
        ...

class Flight(object):
    def __init__(self, ... duration ...)
        ...
        self.duration = duration
        ...

Then you can build and use the objects thus:

player = Player(...[
    Airplane(... [
        Flight(...duration=10...),
        Flight(...duration=15...),
        ] ... ),
    Airplane(...[
        Flight(...duration=20...),
        Flight(...duration=11...),
        Flight(...duration=25...),
        ]...),
    ])

player.airplanes[5].flights[6].duration = 5

User · Answer

class Second      def   init   self  data           self data   data  class First      def SecondClass self  data           return Second data   FirstClass   First   SecondClass   FirstClass SecondClass  now you see me   print SecondClass data

User · Answer

It sounds like you are talking about aggregation  Each instance of your player class can contain zero or more instances of Airplane  which  in turn  can contain zero or more instances of Flight  You can implement this in Python using the built-in list type to save you naming variables with numbers    class Flight object        def   init   self  duration           self duration   duration   class Airplane object        def   init   self           self flights           def add flight self  duration           self flights append Flight duration     class Player object        def   init    self  stock   0  bank   200000  fuel   0  total pax   0           self stock   stock         self bank   bank         self fuel   fuel         self total pax   total pax         self airplanes            def add planes self           self airplanes append Airplane       if   name         main         player   Player       player add planes       player airplanes 0  add flight 5

[python] Python 2.6: Class inside a Class?

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