Twitsted ValueError: Unknown ECC curve on Raspian Stretch - scrapy

Question

I want to use my Raspberry Pi 3, running Rapian Stretch for a web scraping project. For python i use the berryconada distribution.
When I run my Spider, I get
ValueError: Unknown ECC curve
On my Laptop (Xubuntu 16.04) everything runs fine. Maybe I need to install an additional library or something?
Down below the full traceback.
Traceback (most recent call last):
File "/home/pi/berryconda3/lib/python3.6/site-packages/twisted/internet/defer.py", line 1384, in _inlineCallbacks
result = result.throwExceptionIntoGenerator(g)
File "/home/pi/berryconda3/lib/python3.6/site-packages/twisted/python/failure.py", line 393, in throwExceptionIntoGenerator
return g.throw(self.type, self.value, self.tb)
File "/home/pi/berryconda3/lib/python3.6/site-packages/scrapy/core/downloader/middleware.py", line 43, in process_request
defer.returnValue((yield download_func(request=request,spider=spider)))
File "/home/pi/berryconda3/lib/python3.6/site-packages/scrapy/utils/defer.py", line 45, in mustbe_deferred
result = f(*args, **kw)
File "/home/pi/berryconda3/lib/python3.6/site-packages/scrapy/core/downloader/handlers/__init__.py", line 65, in download_request
return handler.download_request(request, spider)
File "/home/pi/berryconda3/lib/python3.6/site-packages/scrapy/core/downloader/handlers/http11.py", line 63, in download_request
return agent.download_request(request)
File "/home/pi/berryconda3/lib/python3.6/site-packages/scrapy/core/downloader/handlers/http11.py", line 300, in download_request
method, to_bytes(url, encoding='ascii'), headers, bodyproducer)
File "/home/pi/berryconda3/lib/python3.6/site-packages/twisted/web/client.py", line 1633, in request
endpoint = self._getEndpoint(parsedURI)
File "/home/pi/berryconda3/lib/python3.6/site-packages/twisted/web/client.py", line 1617, in _getEndpoint
return self._endpointFactory.endpointForURI(uri)
File "/home/pi/berryconda3/lib/python3.6/site-packages/twisted/web/client.py", line 1494, in endpointForURI
uri.port)
File "/home/pi/berryconda3/lib/python3.6/site-packages/scrapy/core/downloader/contextfactory.py", line 59, in creatorForNetloc
return ScrapyClientTLSOptions(hostname.decode("ascii"), self.getContext())
File "/home/pi/berryconda3/lib/python3.6/site-packages/scrapy/core/downloader/contextfactory.py", line 56, in getContext
return self.getCertificateOptions().getContext()
File "/home/pi/berryconda3/lib/python3.6/site-packages/scrapy/core/downloader/contextfactory.py", line 51, in getCertificateOptions
acceptableCiphers=DEFAULT_CIPHERS)
File "/home/pi/berryconda3/lib/python3.6/site-packages/twisted/python/deprecate.py", line 792, in wrapped
return wrappee(*args, **kwargs)
File "/home/pi/berryconda3/lib/python3.6/site-packages/twisted/internet/_sslverify.py", line 1595, in __init__
self._ecCurve = _OpenSSLECCurve(_defaultCurveName)
File "/home/pi/berryconda3/lib/python3.6/site-packages/twisted/internet/_sslverify.py", line 1744, in __init__
raise ValueError("Unknown ECC curve.")

Answer 1

I dropped berryconda and pip installed scrapy. If you're getting this error on Jessie, moving to Stretch gives you access to the newer openssl libs which contain the missing things.
After I upgraded to Stretch I cut berryconda from my path, pip uninstalled cryptography, twisted, pyopenssl, and scrapy.
Then with the no cache option I pip installed scrapy, which brought all those packages back, and now my spider is running.