"""
* Assignment: Protocol Reflection Delattr
* Complexity: easy
* Lines of code: 2 lines
* Time: 3 min

English:
    1. Create class `Point` with `x`, `y`, `z` attributes
    2. Prevent deleting attributes
    3. Run doctests - all must succeed

Polish:
    1. Stwórz klasę `Point` z atrybutami `x`, `y`, `z`
    2. Zablokuj usuwanie atrybutów
    3. Uruchom doctesty - wszystkie muszą się powieść

Tests:
    >>> import sys; sys.tracebacklimit = 0

    >>> pt = Point(1, 2, 3)
    >>> pt.x, pt.y, pt.z
    (1, 2, 3)

    >>> del pt.x
    Traceback (most recent call last):
    PermissionError: Cannot delete attributes

    >>> del pt.notexisting
    Traceback (most recent call last):
    PermissionError: Cannot delete attributes
"""

from dataclasses import dataclass


@dataclass
class Point:
    x: int
    y: int
    z: int


# Solution
@dataclass
class Point:
    x: int
    y: int
    z: int

    def __delattr__(self, item):
        raise PermissionError('Cannot delete attributes')