根据容器元素生成字典-改进方案

青衫桑

from typing import Generator
from typing import Iterable

def index_dict(
        item: list | tuple | Generator | Iterable,
        start: int = 0,
        step: int = 1) -> dict:
    """
    Generate a dictionary whose key is an equal difference sequence according to the container.
    parameter item: Containers containing elements, which can be lists, tuples, generators, iterators.
    parameter start: First number.
    parameter step: Digital interval.
    """
    if not isinstance(item, (list, tuple, Generator, Iterable)):
        raise TypeError("The type of item is not supported")
    if step == 0:
        raise ValueError("step must not be zero")
    return {start + x * step: y for x, y in enumerate(item)}

这个代码是根据传入的列表元素生成一个key为等差数列的字典，想看看有没有优化改进方案。