Python initialiser

Question

I have this initialiser for a line class in Python and it takes two points as a parameter. The problem is my initialiser is only copying the references. So self.point0 and point 0 are pointing to the same object. I am not really sure how to change that so that I am not just copying the reference. Line class:

def __init__(self, point0, point1): 
    self.point0 = point0
    self.point1 = point1

Point class:

def __init__(self, x, y):
    self.x = x
    self.y = y

Answer 1

Use the copy module:

import copy

def __init__(self, point0, point1):

        self.point0 = copy.copy(point0)
        self.point1 = copy.copy(point1)

This is required if your point objects are mutable, such as a lists or dictionaries. If you are using immutable types, such as a tuple, then it would not be required to make a copy.

If your points are represented as lists, you can also make a copy of the list using this syntax:

self.point0 = point0[:]
self.point1 = point1[:]

I could advise you with more certainty if you provided the definition of your point class.

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Update after OP has posted Point class definition:

If copy.copy() is undesirable (why?) you can manually copy the attributes to the new Point instances:

class Line(object):
    def __init__(self, point0, point1):
        self.point0 = Point(point0.x, point0.y)
        self.point1 = Point(point1.x, point1.y)