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| class Point(object): | |
| def __init__(self, x, y): | |
| self.x = x | |
| self.y = y | |
| # See how I dont have to define these above but should define them in init? | |
| self.secret = 'hello Burke' | |
| self.message = None | |
| self.model_results = list() | |
| def __repr__(self): | |
| return "Point<{0}, {1}>".format(self.x, self.y) | |
| def do_something(self, message): | |
| self.message = message | |
| print("If this did something that would be cool instead of just update message. self.message is {0}".format( | |
| self.message)) | |
| def run_model(self): | |
| for i in range(0, 5): | |
| self.model_results.append(i) | |
| print(" .. {0}".format(i)) | |
| class Point3D(Point): | |
| def __init__(self, x, y, h): | |
| super(Point3D, self).__init__(x, y) | |
| self.h = h | |
| def do_something(self): | |
| print("We completly overwrote this function") | |
| return None | |
| def __repr__(self): | |
| return "Point3D<{0}, {1}, {2}>".format(self.x, self.y, self.h) | |
| @property | |
| def sum_coords(self): | |
| print("We can also completly essentially add virtual fields") | |
| return self.x + self.y + self.h | |
| if __name__ == "__main__": | |
| print("Point 1") | |
| pt1 = Point(10.0, 20.0) | |
| print("... but we can also define another obj of the Point type") | |
| pt2 = Point(34.0, 100.0) | |
| print("See how the values of pt1.x != pt2.x ? That's because they are different instances of the same class") | |
| print("pt1.x: {0}".format(pt1.x)) | |
| print("pt1.secret: {0}".format(pt1.secret)) | |
| print("pt2.x: {0}".format(pt2.x)) | |
| print("pt2.secret: {0}".format(pt2.secret)) | |
| print("But I can change values") | |
| pt2.secret = 'Hello 12222' | |
| print("pt2.secret is now: {0}".format(pt2.secret)) | |
| # Value of model_results before we run run_model() | |
| print("Value of model_results BEFORE we run run_model()") | |
| print(pt1.model_results) | |
| print("") | |
| # Classes can do stuff | |
| print("run the model:") | |
| pt1.run_model() | |
| print("Value of model_results AFTER we run run_model()") | |
| print(pt1.model_results) | |
| # Repr allows you define what is shown when the obj gets printed | |
| print("We can also use the __repr__ definition to control how the object prints or is represented as a string") | |
| print(pt1) | |
| pt2 = Point(34.0, 100.0) | |
| # Ok, now lets try that subclass | |
| pt13d = Point3D(10.0, 20.0, 10.0) | |
| print(pt13d) | |
| print("pt13d.secret: {0}".format(pt13d.secret)) | |
| pt13d.do_something() | |
| print("now run the model, its still there") | |
| pt13d.run_model() # See how this still works because the Point3d is subclasses from Point | |
| print("p13d.sum_coords: {0}".format(pt13d.sum_coords)) |
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