from math import sqrt # sqrt used to calculate diagonal distances import random # used to generate random numbers ############################################################################## # Cars and other vehicles ############################################################################## class SuperDuperManager: """A class responsible for keeping track of all cars in the system. === Private Attributes === @type _vehicles: dict[str, Vehicle] A map of unique string identifiers to the corresponding vehicles. For example, _vehicles['a01'] would be a vehicle corresponding to the id_ 'a01'. """ def __init__(self): """Initialize a new SuperDuperManager. Initially there are no vehicles in the system. @type self: SuperDuperManager @rtype: None """ self._vehicles = {} def add_vehicle(self, vehicle_type, id_, fuel): """Add a new vehicle to the system of the given type. The new vehicle is identified by the string , and has initial amount of fuel . Do nothing if there is already a vehicle with the given id. Precondition: is one of 'Car', 'Helicopter', or 'UnreliableMagicCarpet'. @type self: SuperDuperManager @type vehicle_type: str @type id_: str @type fuel: int @rtype: None """ # Check to make sure the identifier isn't already used. if id_ not in self._vehicles: if vehicle_type == 'Car': self._vehicles[id_] = Car(fuel) elif vehicle_type == 'Helicopter': self._vehicles[id_] = Helicopter(fuel) elif vehicle_type == 'UnreliableMagicCarpet': self._vehicles[id_] = UnreliableMagicCarpet(fuel) def move_vehicle(self, id_, new_x, new_y): """Move a vehicle with the given id. The vehicle called should be moved to position (, ). Do nothing if there is no vehicle with the given id, or if the corresponding vehicle does not have enough fuel to move. @type self: SuperDuperManager @type id_: str @type new_x: int @type new_y: int @rtype: None """ if id_ in self._vehicles: self._vehicles[id_].move(new_x, new_y) def get_vehicle_position(self, id_): """Return the position of the vehicle with the given id. Return a tuple of the (x, y) position of the vehicle. Return None if there is no vehicle with the given id. @type self: SuperDuperManager @type id_: str @rtype: (int, int) | None """ if id_ in self._vehicles: return self._vehicles[id_].position def get_vehicle_fuel(self, id_): """Return the amount of fuel of the vehicle with the given id. Return None if there is no vehicle with the given id. @type self: SuperDuperManager @type id_: str @rtype: int | None """ if id_ in self._vehicles: return self._vehicles[id_].fuel class Vehicle: """An interface for a vehicle in the Super Duper system. Note that this interface specifies *two* public attributes, and *two* public methods (the constructor is not considered public). Of the public methods, a default implementation is given for move, but not fuel_needed. It also defines a constructor that should be called by each of its subclasses. === Attributes === @type position: (int, int) The position of this vehicle. @type fuel: int The amount of fuel remaining for this vehicle. === Representation invariants === - fuel >= 0 """ def __init__(self, new_fuel, new_position): """Initialize a new Vehicle with the given fuel and position. Precondition: new_fuel >= 0 @type self: Vehicle @type new_fuel: int @type new_position: (int, int) @rtype: None """ self.fuel = new_fuel self.position = new_position def fuel_needed(self, new_x, new_y): """Return how much fuel would be used to move to the given position. Note: the amount returned may be larger than self.fuel, indicating that this vehicle may not move to the given position. @type self: Vehicle @type new_x: int @type new_y: int @rtype: float """ raise NotImplementedError def move(self, new_x, new_y): """Move this vehicle to a new position. Do nothing if this vehicle does not have enough fuel to move. @type self: Vehicle @type new_x: int @type new_y: int @rtype: None """ needed = self.fuel_needed(new_x, new_y) if needed <= self.fuel: self.position = (new_x, new_y) self.fuel -= needed Question: class Car(Vehicle): """A car in the Super Duper system. A car can only move vertically and horizontally and uses one unit of fuel per unit distance travelled. """
from math import sqrt # sqrt used to calculate diagonal distances
import random # used to generate random numbers
##############################################################################
# Cars and other vehicles
##############################################################################
class SuperDuperManager:
"""A class responsible for keeping track of all cars in the system.
=== Private Attributes ===
@type _vehicles: dict[str, Vehicle]
A map of unique string identifiers to the corresponding vehicles.
For example, _vehicles['a01'] would be a vehicle corresponding to
the id_ 'a01'.
"""
def __init__(self):
"""Initialize a new SuperDuperManager.
Initially there are no vehicles in the system.
@type self: SuperDuperManager
@rtype: None
"""
self._vehicles = {}
def add_vehicle(self, vehicle_type, id_, fuel):
"""Add a new vehicle to the system of the given type.
The new vehicle is identified by the string <id_>,
and has initial amount of fuel <fuel>.
Do nothing if there is already a vehicle with the given id.
Precondition: <vehicle_type> is one of 'Car', 'Helicopter', or
'UnreliableMagicCarpet'.
@type self: SuperDuperManager
@type vehicle_type: str
@type id_: str
@type fuel: int
@rtype: None
"""
# Check to make sure the identifier isn't already used.
if id_ not in self._vehicles:
if vehicle_type == 'Car':
self._vehicles[id_] = Car(fuel)
elif vehicle_type == 'Helicopter':
self._vehicles[id_] = Helicopter(fuel)
elif vehicle_type == 'UnreliableMagicCarpet':
self._vehicles[id_] = UnreliableMagicCarpet(fuel)
def move_vehicle(self, id_, new_x, new_y):
"""Move a vehicle with the given id.
The vehicle called <id_> should be moved to position (<new_x>, <new_y>).
Do nothing if there is no vehicle with the given id,
or if the corresponding vehicle does not have enough fuel to move.
@type self: SuperDuperManager
@type id_: str
@type new_x: int
@type new_y: int
@rtype: None
"""
if id_ in self._vehicles:
self._vehicles[id_].move(new_x, new_y)
def get_vehicle_position(self, id_):
"""Return the position of the vehicle with the given id.
Return a tuple of the (x, y) position of the vehicle.
Return None if there is no vehicle with the given id.
@type self: SuperDuperManager
@type id_: str
@rtype: (int, int) | None
"""
if id_ in self._vehicles:
return self._vehicles[id_].position
def get_vehicle_fuel(self, id_):
"""Return the amount of fuel of the vehicle with the given id.
Return None if there is no vehicle with the given id.
@type self: SuperDuperManager
@type id_: str
@rtype: int | None
"""
if id_ in self._vehicles:
return self._vehicles[id_].fuel
class Vehicle:
"""An interface for a vehicle in the Super Duper system.
Note that this interface specifies *two* public attributes,
and *two* public methods (the constructor is not considered public).
Of the public methods, a default implementation is given for move,
but not fuel_needed.
It also defines a constructor that should be called by each of its
subclasses.
=== Attributes ===
@type position: (int, int)
The position of this vehicle.
@type fuel: int
The amount of fuel remaining for this vehicle.
=== Representation invariants ===
- fuel >= 0
"""
def __init__(self, new_fuel, new_position):
"""Initialize a new Vehicle with the given fuel and position.
Precondition: new_fuel >= 0
@type self: Vehicle
@type new_fuel: int
@type new_position: (int, int)
@rtype: None
"""
self.fuel = new_fuel
self.position = new_position
def fuel_needed(self, new_x, new_y):
"""Return how much fuel would be used to move to the given position.
Note: the amount returned may be larger than self.fuel,
indicating that this vehicle may not move to the given position.
@type self: Vehicle
@type new_x: int
@type new_y: int
@rtype: float
"""
raise NotImplementedError
def move(self, new_x, new_y):
"""Move this vehicle to a new position.
Do nothing if this vehicle does not have enough fuel to move.
@type self: Vehicle
@type new_x: int
@type new_y: int
@rtype: None
"""
needed = self.fuel_needed(new_x, new_y)
if needed <= self.fuel:
self.position = (new_x, new_y)
self.fuel -= needed
Question:
class Car(Vehicle):
"""A car in the Super Duper system.
A car can only move vertically and horizontally and uses
one unit of fuel per unit distance travelled.
"""
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