python - lxml -- 如何将 img src 更改为绝对链接

Question

使用 lxml，如何用绝对链接全局替换所有 src 属性？

Answer 1

这是一个示例代码，它也涵盖了 <a href> :

from lxml import etree, html
import urlparse

def fix_links(content, absolute_prefix):
    """
    Rewrite relative links to be absolute links based on certain URL.

    @param content: HTML snippet as a string
    """

    if type(content) == str:
        content = content.decode("utf-8")

    parser = etree.HTMLParser()

    content = content.strip()

    tree  = html.fragment_fromstring(content, create_parent=True)

    def join(base, url):
        """
        Join relative URL
        """
        if not (url.startswith("/") or "://" in url):
            return urlparse.urljoin(base, url)
        else:
            # Already absolute
            return url

    for node in tree.xpath('//*[@src]'):
        url = node.get('src')
        url = join(absolute_prefix, url)
        node.set('src', url)
    for node in tree.xpath('//*[@href]'):
        href = node.get('href')
        url = join(absolute_prefix, href)
        node.set('href', url)

    data =  etree.tostring(tree, pretty_print=False, encoding="utf-8")

    return data

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