Re: I want to lirn pithon but pithon doesn't want me to do so
@Meatbag, properties can be used to make the user's life easier.
Consider a player. You generally don't want to make them walk past 0 on the x or y. There are some exceptions but, urm, we won't talk about those.
So, one way of doing it could be like so:
class Player:
def __init__(self):
self.x = 0
def get_x(self):
return self.x
def set_x(self, value):
self.x = max(value, 0)There you have it. As long as you use the get_x and set_x functions, you'll be good. This is as close as Python gets to private variables. Try setting the x to something like -5 by using set_x, and you'll see that it doesn't work.
Now, it's pretty annoying to type get_x and set_x, isn't it? So, here's where properties come in:
Our player class can be rewritten like so, which will save you some keystrokes when typing code.
class Player:
def __init__(self):
self._x = 0
@property
def x(self):
return self._x
@x.setter
def x(self, value):
self._x = max(value, 0)The beauty of propertys is this will work:
player.x = -2 #X is 0 because Python calls the function we wrote earlier to block negative values
print(player.x) #Same as if you would have used get_x() in our last exampleHope this helps. Do note the underscore before the variable in the __init__ function. These are typically placed in front of things that are not meant to be accessed directly. Technically, Python allows you to do whatever with the object, but it's a convention that you should get into habit of following
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