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:param url: url of the resource pointed to (href of the link)
:param comes_from: instance of HTMLPage where the link was found,
or string.
:param requires_python: String containing the `Requires-Python`
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a data-requires-python attribute in the HTML link tag, as
described in PEP 503.
:param yanked_reason: the reason the file has been yanked, if the
file has been yanked, or None if the file hasn't been yanked.
This is the value of the "data-yanked" attribute, if present, in
a simple repository HTML link. If the file has been yanked but
no reason was provided, this should be the empty string. See
PEP 592 for more information and the specification.
:param cache_link_parsing: A flag that is used elsewhere to determine
whether resources retrieved from this link
should be cached. PyPI index urls should
generally have this set to False, for
example.
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Return True if the link has a hash and it is allowed.
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