小编Kar*_*any的帖子

我有以下具有多种情况的代码：

def _extract_property_value(selector: Selector) -> str:
    raw_value = selector.xpath("span[2]")

    default_value = raw_value.xpath("./text()").get().strip()
    value_with_a = ', '.join([value.strip() for value in raw_value.xpath("./a /text()").getall()])
    value_with_div_and_a = ', '.join([value.strip() for value in raw_value.xpath("./div /a /text()").getall()])

    if value_with_a:
        return value_with_a
    elif value_with_div_and_a:
        return value_with_div_and_a
    elif default_value:
        return default_value

我想摆脱 if 语句并尽可能简化此代码。我不是优秀的 Pyton 开发者。我知道有模式“策略”，下面我试图实现它：

def _extract_property_value(selector: Selector) -> str:
    raw_value = selector.xpath("span[2]")
    values_dict = {
        'default value': raw_value.xpath("./text()").get().strip(),
        'value with a': ', '.join([value.strip() for value in raw_value.xpath("./a /text()").getall()]),
        'value with div and a': ', '.join([value.strip() for …