Question

Im completly new to Python. Following this guide: http://roguebasin.roguelikedevelopment.org/index.php/Complete_Roguelike_Tutorial,_using_python%2Blibtcod

I have a simple question: When all the monsters have been created here, how does python distinguish between each instance of the class? As far as i can tell, all the instances are named “monster”.

def place_objects(room):
#choose random number of monsters
num_monsters = libtcod.random_get_int(0, 0, MAX_ROOM_MONSTERS)

for i in range(num_monsters):
    #choose random spot for this monster
    x = libtcod.random_get_int(0, room.x1, room.x2)
    y = libtcod.random_get_int(0, room.y1, room.y2)

    #only place it if the tile is not blocked
    if not is_blocked(x, y):
        if libtcod.random_get_int(0, 0, 100) < 80:  #80% chance of getting an orc
            #create an orc
            fighter_component = Fighter(hp=10, defense=0, power=3, death_function=monster_death)
            ai_component = BasicMonster()

            monster = Object(x, y, 'o', 'orc', libtcod.desaturated_green,
                blocks=True, fighter=fighter_component, ai=ai_component)
        else:
            #create a troll
            fighter_component = Fighter(hp=16, defense=1, power=4, death_function=monster_death)
            ai_component = BasicMonster()

            monster = Object(x, y, 'T', 'troll', libtcod.darker_green,
                blocks=True, fighter=fighter_component, ai=ai_component)

        objects.append(monster)

Answer 1

Each object is stored at different memory location. That’s how you differentiate.

Use the builtin function id()

id(object) 
Return the “identity” of an object. This is an integer (or long integer) which is guaranteed to be unique and constant for this object during its lifetime. Two objects with non-overlapping lifetimes may have the same id() value.

Documentation also says

CPython implementation detail: This is the address of the object in
memory.

Example:

>>> class Foo:
...     pass
... 
>>> x = Foo()
>>> y = Foo()
>>> id (x)
17385736
>>> id (y)
20391336
>>>