class Point:
def __init__(self, x, y):
self._x = x
self._y = y
The init method gets called when memory for the object is allocated:
x = Point(1,2)
It is important to use the self parameter inside an object's method if you want to persist the value with the object. If, for instance, you implement the init method like this:
class Point:
def __init__(self, x, y):
_x = x
_y = y
Your x and y parameters would be stored in variables on the stack and would be discarded when the init method goes out of scope. Setting those variables as self._x sets those variables as members of the Point object (accessible for the lifetime of the object).
No comments:
Post a Comment