Source code for stuff

import random
import operator

tab = ' '

class Universe(object):
    """ Container for ships """
    def __init__(self):
        self.dtype = 'universe'
    
    def list_ships(self):
        ships = []
        for local in self.__dict__.keys():
            local = self.__dict__[local]
            if hasattr(local,'dtype'):
                if local.dtype == 'Ship':                   
                    ships.append(local)
        ships.sort(key=operator.attrgetter('title'))
        return ships
        
class Ship(object):
    """ The big ship object """
    
    def __init__(self):
        self.dtype = 'Ship'
        self.shields = 0
        self.max_shields = 0
        self.alive = True
        self.title = ''
        
        
    def take_damage(self, damage):
        self.shields -= damage
        if self.shields < 1:
            print tab + self.title, 'Destroyed!!!'
            self.alive = False
            return self.alive
        remaining = str(self.shields / self.max_shields * 100)[:2]
        
        print '%s%s shields down to %s%%.' % (tab,self.title,remaining)
        return self.alive
    
class Component(object):
    """ Parts of the ship """
    
    def __init__(self):
        self.dtype = 'Component'
    def action(self):
        pass        
    
class Spinal_Mount(Component):
    """ Big honking laster """
    
    def __init__(self):
        self.av = 0
        self.dv = 0                 
        self.volume = 1
        self.capacitor = 100
        self.max_capacitor = 100        
        self.recharge_capacitor = 10            
        self.range = 15
        self.option = 'Fire (S)pinal Mount'
        
    def recharge(self):
        
        self.capacitor = min(self.max_capacitor, self.capacitor + self.recharge_capacitor)          
        
    def action(self,me=None,enemy=None):
        print tab + 'Firing Spinal Mount!'
        hit = False
        energy = 0
        survived = True
        for laser in range(10):
            energy = (laser + 1) ** 2       
            if energy > self.capacitor:
                print tab + 'Spinal Mount out of juice'
                break
            if not hit:
                av = random.randrange(me.av + self.av + laser)
                dv = random.randrange(enemy.dv)
                if av > dv:
                    hit = True
                else:
                    print tab + 'Spinal Mount missed'
            if hit:
                print tab + 'Spinal Mount locked on'
                survived = enemy.take_damage(random.randrange(10)+1)
            if not survived:
                break

        self.capacitor -= energy
        print tab + 'Spinal mount firing sequence over.'        
        return survived

    
class Pulsar(Component):
    def __init__(self):
        self.av = 0
        self.dv = 0             
        self.volume = 1
        self.range = 5
        self.option = 'Fire (P)ulsar'       
        
    def action(self,me=None,enemy=None):
        print tab + me.title + ' firing Pulsar!'
        av = random.randrange(me.av + self.av)
        dv = random.randrange(enemy.dv)     
        return enemy.take_damage(10)
        

class Missile(Component):
    def __init__(self):
        self.av = 20
        self.dv = 0         
        self.damage = 'd2'
        self.volume = 1
        self.range = 10
        self.ammo = 5
        self.option = 'Fire (M)issile'          
        
    def action(self,me=None,enemy=None):
        if self.ammo == 0:
            print tab + 'Out of missiles.'
            return True
        print tab + 'Launching missile!'
        self.ammo -= 1
        av = random.randrange(me.av + self.av)
        dv = random.randrange(enemy.dv)     
        if av < dv:
            print tab + 'Missile missed'        
            return True
        print tab + 'Missile hit!!!'                    
        damage = (random.randrange(10) + 1) * (random.randrange(10) + 1)
        return enemy.take_damage(damage)        
        
class ECM(Component):
    def __init__(self):
        self.av = 0
        self.dv = 40
        self.volume = 1
        self.option = '(E)CM'
        
    def action(self,me=None,enemy=None):
        return True

class Frigate(Ship):
    def __init__(self,name='',id='',dv=None):
        Ship.__init__(self)
        self.title = name
        self.id = id
        self.av = 40
        if dv:
            self.dv = dv
        else:
            self.dv = 1 + (random.randrange(10) * random.randrange(10))
        self.volume = 2
        self.shields = 30.0
        self.max_shields = 30.0
        self.recharge_shields = 3
        self.thrust = 8
        self.pulsar = Pulsar()
        self.ecm = ECM()            
        self.side = 'bad'
        
    def recharge(self):
        self.shields = min(self.shields + self.recharge_shields, self.max_shields)

class Cruiser(Ship):
    def __init__(self,name='',id=''):
        Ship.__init__(self)
        self.title = name       
        self.id = id
        self.av = 20
        self.dv = 10
        self.volume = 3
        self.shields = 100.0
        self.max_shields = 100.0
        self.recharge_shields = 1
        self.thrust = 5
        self.spinal_mount = Spinal_Mount()
        self.missile = Missile()
        self.ecm = ECM()
        self.side = 'good'          
        
    def recharge(self):
        self.shields = min(self.shields + self.recharge_shields, self.max_shields)
        self.spinal_mount.recharge()        
        
    def damage_control(self):
        self.shields = min(self.shields + 10, self.max_shields)