python - 连续尝试/排除块的替代方法

我对Python相当陌生，所以我想知道是否有比运行大量连续try/except块更简洁的替代方案，如下所示？

try:
    project_type = body.find_element_by_xpath('./div[contains(@class, "discoverableCard-type")]').text
except Exception:
    project_type = 'Error'
try:
    title = body.find_element_by_xpath('./div[contains(@class, "discoverableCard-title")]').text
except Exception:
    title = 'Error'
try:
    description = body.find_element_by_xpath('./div[contains(@class, "discoverableCard-description")]').text
except Exception:
    description = 'Error'
try:
    category = body.find_element_by_xpath('./div[contains(@class, "discoverableCard-category")]').text
except Exception:
    category = 'Error'
...

正如this thread或this thread,中所建议的那样，我想我可以创建变量名和查询的列表，然后使用for循环为每个容器项目构造一个字典，但实际上没有其他替代方法可能更具可读性吗？

最佳答案

您可以将调用抽象为find_element_by_xpath；这样可以避免代码重复，并使代码更具可读性:

def _find_element_by_xpath(body, xpath)
    try:
        return body.find_element_by_xpath(xpath).text
    except Exception:   # <-- Be specific about the Exception to catch
        return 'Error'

def get_a_specific_xpath(element):
    return f'./div[contains(@class, "discoverableCard-{element}")]'

然后您的代码变为:

project_type = _find_element_by_xpath(body, get_a_specific_xpath('project_type'))
title = _find_element_by_xpath(body, get_a_specific_xpath('title'))
description = _find_element_by_xpath(body, get_a_specific_xpath('description'))
category = _find_element_by_xpath(body, get_a_specific_xpath('category'))
...

关于python - 连续尝试/排除块的替代方法，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/51072895/