Python中使用循环与条件过滤URL失效问题求助

你的过滤逻辑存在错误，导致所有URL都被保留。原代码中，对每个URL会遍历filterlist的所有元素，只要有一个元素不在URL中，就把该URL添加到结果列表。比如YouTube的URL，虽然包含youtube.com，但它不包含twitter.com等其他4个元素，因此会触发添加操作，最终所有URL都被保留下来。

错误代码问题点 #

weblinks =[]
fetchurl = ['https://www.youtube.com/watch?v=___nkvwpnAg&t=1218', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://wonderfulwanderings.com/interesting-facts-about-the-netherlands/'] 

filterlist = ["youtube.com","twitter.com","facebook.com","google.com","tiktok.com"]
for ur in fetchurl:
    for i in range(len(filterlist)):
        if filterlist[i] not in ur:
            weblinks.append(ur)  # 只要有一个过滤词不在URL里就添加，逻辑错误
print("weblinks url working", weblinks)

修正方案 #

我们需要判断：URL不包含filterlist中的任何一个元素时，才将其加入结果列表。以下两种写法都可以实现需求：

方案1：使用any()函数（简洁写法） #

weblinks = []
fetchurl = ['https://www.youtube.com/watch?v=___nkvwpnAg&t=1218', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://wonderfulwanderings.com/interesting-facts-about-the-netherlands/'] 

filterlist = ["youtube.com","twitter.com","facebook.com","google.com","tiktok.com"]
for ur in fetchurl:
    # 如果URL中不包含filterlist里的任何一个元素，才添加
    if not any(domain in ur for domain in filterlist):
        weblinks.append(ur)
print("weblinks url working", weblinks)

方案2：调整循环逻辑（直观写法） #

weblinks = []
fetchurl = ['https://www.youtube.com/watch?v=___nkvwpnAg&t=1218', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://wonderfulwanderings.com/interesting-facts-about-the-netherlands/'] 

filterlist = ["youtube.com","twitter.com","facebook.com","google.com","tiktok.com"]
for ur in fetchurl:
    should_keep = True
    for domain in filterlist:
        if domain in ur:
            should_keep = False
            break  # 一旦发现包含过滤域名，直接跳过后续检查
    if should_keep:
        weblinks.append(ur)
print("weblinks url working", weblinks)

修正后输出 #

运行上述代码后，输出会过滤掉YouTube的URL，只保留符合要求的6个URL：

weblinks url working ['https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://www.farandwide.com/s/fascinating-facts-every-country-7c1f1a0efdf64979', 'https://wonderfulwanderings.com/interesting-facts-about-the-netherlands/']

内容的提问来源于stack exchange，提问作者Info Rewind