"""
This module defines the Link object used in Link extractors.
For actual link extractors implementation see scrapy.linkextractors, or
its documentation in: docs/topics/link-extractors.rst
"""
[文档]class Link:
"""Link objects represent an extracted link by the LinkExtractor.
Using the anchor tag sample below to illustrate the parameters::
<a href="https://example.com/nofollow.html#foo" rel="nofollow">Dont follow this one</a>
:param url: the absolute url being linked to in the anchor tag.
From the sample, this is ``https://example.com/nofollow.html``.
:param text: the text in the anchor tag. From the sample, this is ``Dont follow this one``.
:param fragment: the part of the url after the hash symbol. From the sample, this is ``foo``.
:param nofollow: an indication of the presence or absence of a nofollow value in the ``rel`` attribute
of the anchor tag.
"""
__slots__ = ['url', 'text', 'fragment', 'nofollow']
def __init__(self, url, text='', fragment='', nofollow=False):
if not isinstance(url, str):
got = url.__class__.__name__
raise TypeError(f"Link urls must be str objects, got {got}")
self.url = url
self.text = text
self.fragment = fragment
self.nofollow = nofollow
def __eq__(self, other):
return (
self.url == other.url
and self.text == other.text
and self.fragment == other.fragment
and self.nofollow == other.nofollow
)
def __hash__(self):
return hash(self.url) ^ hash(self.text) ^ hash(self.fragment) ^ hash(self.nofollow)
def __repr__(self):
return (
f'Link(url={self.url!r}, text={self.text!r}, '
f'fragment={self.fragment!r}, nofollow={self.nofollow!r})'
)