擅长:python、mysql、java
<p>可以使用<code>string.rfind()</code>函数,它按相反的顺序搜索字符串。你知道吗</p>
<p>示例-</p>
<pre><code>>>> if ' 645w' in src:
... index = src.find(' 645w')
... end_of_url = src[:index]
... print(end_of_url[end_of_url.rfind('//'):])
...
//i.guim.co.uk/img/media/d126680aca92ff4251536f788b60233b5463af89/1585_707_3685_2210/3685.jpg?w=645&q=85&auto=format&sharp=10&s=19e251fb9bd21787e8364c091e4a89ce
</code></pre>