[MacPorts] #51772: py27-scrapy is missing several dependencies

[MacPorts]

#51772: py27-scrapy is missing several dependencies
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 Reporter:  hans_meine@…  |      Owner:  macports-tickets@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.4
 Keywords:                |       Port:
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 I installed py27-scrapy, and expected it to be runnable without further
 action.  In particular, it comes with a binary "scrapy-2.7" that should be
 usable and can be used for reproducing this issue.  For me, it gave an
 error like:
 {{{
 pkg_resources.DistributionNotFound: The 'service_identity' distribution
 was not found and is required by Scrapy
 }}}
 After fixing the missing dependency, I got the next such problem, and it
 turns out there are a lot of such missing dependencies, none of which seem
 to have ports at the moment:
 * service-identity
 * PyDispatcher
 * parsel
 * w3lib>=1.14.2 (py27-w3lib port available, but needs update)
 In general, I don't expect every python package to have a port, but I
 wanted to report that py27-scrapy is not functional this way.

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Ticket URL: <https://trac.macports.org/ticket/51772>
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