AttributeError when creating an object with Tuple attribute-CodePudding

I just started working with OOP in Python and I'm asked to create a class named Square with a specific attribute called position, which is of type tuple. So for each Square object there is a particular method to print it, given the size attribute (prints '#' of size*size) and position attribute (starts at coordenates (x, y)) but when I have an AttributeError in the init method which tells me:

AttributeError: 'Square' object has no attribute '_Square__position'

Here's the code:

class Square:
''' create Square instance with public attributes
size and position '''
def __init__(self, size=0, position=(0, 0)):
    self.size = size
    self.position = position

''' retrieve size and make it private'''
@property
def size(self):
    return self.__size

''' set private size attribute '''
@size.setter
def size(self, value):
    if type(value) is not int:
        raise TypeError("size must be an integer")
    if value < 0:
        raise ValueError("size must be >= 0")
    self.__size = value

''' retrieve position and make it private '''
@property
def position(self):
    return self.__position

''' set private position attribute '''
@position.setter
def position(self, value):
    if value[0] < 0 or value[1] < 0:
        raise TypeError("position must be a tuple of 2 positive integers")
    self.__position[0] = value[0]
    self.__position[1] = value[1]

''' calculates area of square '''
def area(self):
    return self.__size ** 2

''' print a square of # the size of self.__size'''
def my_print(self):
    if self.__size == 0:
        print()
    else:
        for line in range(self.__position[1]):
            print()
        for i in range(self.__size):
            for space in range(self.__position[0]):
                print(" ", end="")
            for j in range(self.__size):
                print('#', end="")
            print()

Any help is appreciated, thanks!

CodePudding user response：

Your __init__() method should be like this:

def __init__(self, size=0, position=(0, 0)):
    self.__size = size    #<-- dunder
    self.__position = position #<-- dunder

Edit

Thanks to @tdelaney who pointed out that position is a tuple which doesn't allow item assignment. So, your @position.setter should be like this:

@position.setter
def position(self, value):
    if type(value) != tuple or value[0] < 0 or value[1] < 0:
        raise TypeError("position must be a tuple of 2 positive integers")
    self.__position = value