從python 3中的列表中刪除

Question

我有一個從網站上刪除的列表。 我想刪除網站各個頁面的錨點鏈接，例如'/ about /'。 有很多。 有沒有一種方法可以構建一個查看文本的代碼，如果是“http”（不僅僅是https，就像下面的數據一樣，因為如果“s”不在那里）是在文本然后它會將其添加到列表中？ 我的列表數據是這樣的：

['mailto:info@yourdomain.com', 'https://www.demodms.com/annuity/', 'https://www.demodms.com/annuity/', 'https://www.demodms.com/annuity/about/', 'https://www.demodms.com/annuity/services/', 'https://www.demodms.com/annuity/educational-courses/', 'https://www.demodms.com/annuity/events/', 'https://www.demodms.com/annuity/articles-and-downloads/', 'https://www.demodms.com/annuity/videos/', 'https://www.demodms.com/annuity/calculators/', 'https://www.demodms.com/annuity/news/', 'https://www.demodms.com/annuity/contact/', 'https://www.demodms.com/annuity/', 'https://www.demodms.com/annuity/about/', 'https://www.demodms.com/annuity/services/', 'https://www.demodms.com/annuity/educational-courses/', 'https://www.demodms.com/annuity/events/', 'https://www.demodms.com/annuity/articles-and-downloads/', 'https://www.demodms.com/annuity/videos/', 'https://www.demodms.com/annuity/calculators/', 'https://www.demodms.com/annuity/news/', 'https://www.demodms.com/annuity/contact/', '/events/', 'https://www.demodms.com/annuity/tips-for-back-to-school-season/', 'https://www.demodms.com/annuity/tips-for-back-to-school-season/', 'https://www.demodms.com/annuity/5-things-to-know-about-getting-life-insurance-for-your-child/', 'https://www.demodms.com/annuity/5-things-to-know-about-getting-life-insurance-for-your-child/', 'https://www.demodms.com/annuity/5-signs-you-need-to-up-your-life-insurance-coverage/', 'https://www.demodms.com/annuity/5-signs-you-need-to-up-your-life-insurance-coverage/', 'https://www.demodms.com/annuity/tips-for-summer-travel/', 'https://www.demodms.com/annuity/tips-for-summer-travel/', 'mailto:Info@yourdomain.com', '/about/', '/events/', '/news/', '/contact/', 'https://youtechassociates.com/', '/privacy-policy', '/terms-of-use', '/disclosure/']

Answer 1

您可以使用帶有正則表達式的list-comprehension來過濾掉不包含協議的鏈接：

[link for link in links if re.match('https?\:\/\/', link)]

贈送：

['https://www.demodms.com/annuity/', 'https://www.demodms.com/annuity/', 'https://www.demodms.com/annuity/about/', 'https://www.demodms.com/annuity/services/', 'https://www.demodms.com/annuity/educational-courses/', 'https://www.demodms.com/annuity/events/', 'https://www.demodms.com/annuity/articles-and-downloads/', 'https://www.demodms.com/annuity/videos/', 'https://www.demodms.com/annuity/calculators/', 'https://www.demodms.com/annuity/news/', 'https://www.demodms.com/annuity/contact/', 'https://www.demodms.com/annuity/', 'https://www.demodms.com/annuity/about/', 'https://www.demodms.com/annuity/services/', 'https://www.demodms.com/annuity/educational-courses/', 'https://www.demodms.com/annuity/events/', 'https://www.demodms.com/annuity/articles-and-downloads/', 'https://www.demodms.com/annuity/videos/', 'https://www.demodms.com/annuity/calculators/', 'https://www.demodms.com/annuity/news/', 'https://www.demodms.com/annuity/contact/', 'https://www.demodms.com/annuity/tips-for-back-to-school-season/', 'https://www.demodms.com/annuity/tips-for-back-to-school-season/', 'https://www.demodms.com/annuity/5-things-to-know-about-getting-life-insurance-for-your-child/', 'https://www.demodms.com/annuity/5-things-to-know-about-getting-life-insurance-for-your-child/', 'https://www.demodms.com/annuity/5-signs-you-need-to-up-your-life-insurance-coverage/', 'https://www.demodms.com/annuity/5-signs-you-need-to-up-your-life-insurance-coverage/', 'https://www.demodms.com/annuity/tips-for-summer-travel/', 'https://www.demodms.com/annuity/tips-for-summer-travel/', 'https://youtechassociates.com/']

Answer 2

您可以使用過濾器來獲得此結果

a = ['mailto:info@yourdomain.com', 'https://www.demodms.com/annuity/', 'https://www.demodms.com/annuity/', 'https://www.demodms.com/annuity/about/', 'https://www.demodms.com/annuity/services/', 'https://www.demodms.com/annuity/educational-courses/', 'https://www.demodms.com/annuity/events/', 'https://www.demodms.com/annuity/articles-and-downloads/', 'https://www.demodms.com/annuity/videos/', 'https://www.demodms.com/annuity/calculators/', 'https://www.demodms.com/annuity/news/', 'https://www.demodms.com/annuity/contact/', 'https://www.demodms.com/annuity/', 'https://www.demodms.com/annuity/about/', 'https://www.demodms.com/annuity/services/', 'https://www.demodms.com/annuity/educational-courses/', 'https://www.demodms.com/annuity/events/', 'https://www.demodms.com/annuity/articles-and-downloads/', 'https://www.demodms.com/annuity/videos/', 'https://www.demodms.com/annuity/calculators/', 'https://www.demodms.com/annuity/news/', 'https://www.demodms.com/annuity/contact/', '/events/', 'https://www.demodms.com/annuity/tips-for-back-to-school-season/', 'https://www.demodms.com/annuity/tips-for-back-to-school-season/', 'https://www.demodms.com/annuity/5-things-to-know-about-getting-life-insurance-for-your-child/', 'https://www.demodms.com/annuity/5-things-to-know-about-getting-life-insurance-for-your-child/', 'https://www.demodms.com/annuity/5-signs-you-need-to-up-your-life-insurance-coverage/', 'https://www.demodms.com/annuity/5-signs-you-need-to-up-your-life-insurance-coverage/', 'https://www.demodms.com/annuity/tips-for-summer-travel/', 'https://www.demodms.com/annuity/tips-for-summer-travel/', 'mailto:Info@yourdomain.com', '/about/', '/events/', '/news/', '/contact/', 'https://youtechassociates.com/', '/privacy-policy', '/terms-of-use', '/disclosure/']

b = filter(lambda x: 'http' not in  x, a)
print(list(b))

輸出：

['mailto：info@yourdomain.com'，'/ events /'，'mailto：Info@yourdomain.com'，'/ about /'，'/ events /'，'/ news /'，'/ contact /' ，'/ privacy-policy'，'/ terms-of-use'，'/ disclosure /']

Answer 3

這是一個簡單的方法：

mlist = your-list-as-specified-above

newlist = []
for m in mlist:
    if m.startswith('http'):
        newlist.append(m)

Answer 4

我會使用list comprehension和startswith() ：

full_links = [link for link in links if link.startswith('http://') or link.startswith('https://')]

當你有這么簡單的任務時，我認為這比正則表達式更清晰。 另外，IMO你應該明確地要求http://和https:// ，因為如果遇到像http_stuff/foo.html這樣的相對鏈接，只使用http可能會給你誤報。