bob gailer wrote:
> ------------ Python coding "trick"1 ------------
> when I build a map I omit the () after the class e.g. 'death' = Death,
> ... and apply them to the item retrieved from the map.
>
> use a decorator to build the map dictionary:
>
> # the decorator function:
> def add_to_map(cls, map={}): # map is initialized to a {} when function
> is "compiled"
> if cls:
> map[cls.__name__] = cls # add entry to dictionary
> return cls
> else: return map
>
> # apply decorator to class definitions
> # this will add 'Death': <class '__main__.Death'>
> @add_to_map
> class Death(Scene):
> class_definition
>
> # ditto for all other classes based on Scene - then
>
> class Map:
> scenes = add_to_map() # note when map is called with no arguments
> it returns the dictionary
Hm, you have now replaced the dead simple
> class Map(object):
> scenes = {
> 'central_corridor': CentralCorridor(),
> 'laser_weapon_armory': LaserWeaponArmory(),
> 'the_bridge': TheBridge(),
> 'escape_pod': EscapePod(),
> 'death': Death()
> }
with a class decorator, a dunder name, a mutable default argument -- lots of
clever Python specific stuff that I wouldn't put on a beginner's list of top
priorities.
Don't use unless you spotted at least one bug in the code sample at first
glance :)
By the way, you do not need a map (dict) at all to implement a game like
this, you may return the next scene directly. A sketch:
class Bridge:
def enter(self):
...
action = ...
if action == "jump off the bridge":
return Death("You are eaten by the piranhas")
else:
...
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