如何将符号变量转换为可迭代变量？

x = Symbol('x')
iterable_list = [x.subs(x, i) for i in range(5)]

x = Symbol('x')
iterable_generator = (x.subs(x, i) for i in range(5))

class SymbolIterator:
    def __init__(self, symbol, stop):
        self.symbol = symbol
        self.current = 0
        self.stop = stop

    def __iter__(self):
        return self

    def __next__(self):
        if self.current < self.stop:
            value = self.symbol.subs(self.symbol, self.current)
            self.current += 1
            return value
        else:
            raise StopIteration

x = Symbol('x')
iterable_iterator = SymbolIterator(x, 5)