Please review and refactor the following Python code to follow modern best practices and PEP 8 standards.

Refactoring requirements:

1. Ensure PEP 8 compliance (readability, formatting, naming conventions).
2. Improve structure, modularity, and performance.
3. Add docstrings, comments, and type hints where needed.
4. Optimize loops, data structures, and error handling.
5. Replace deprecated or inefficient code with modern Pythonic alternatives.
6. Provide a brief explanation of the improvements made.

[insert code here]

class Point:
    def __init__(self, x: float, y: float) -> None:
        self.x = x
        self.y = y

    def __str__(self) -> str:
        #

point = Point(1.2, 3.4)

class Point:
    __slots__ = ('x', 'y')

    def __init__(self, x: float, y: float) -> None:
        self.x = x
        self.y = y

    def __str__(self) -> str:
        #

point = Point(1.2, 3.4)

from groovy import transpile

def sum_range(n: int):
    total = 0
    for i in range(n):
        total = total + i
    return total

js_code = transpile(sum_range)
print(js_code)

function sum_range(n) {
    let total = 0;
    for (let i of Array.from({length: n}, (_, i) => i)) {
        total = (total + i);
    }
    return total;
}