scrapy 설치는 성공했으나 command가 실행되지 않을때

MacBookPro:~|⇒  scrapy
Traceback (most recent call last):
  File "/usr/local/bin/scrapy", line 7, in <module>
    from scrapy.cmdline import execute
  File "/Library/Python/2.7/site-packages/scrapy/cmdline.py", line 9, in <module>
    from scrapy.crawler import CrawlerProcess
  File "/Library/Python/2.7/site-packages/scrapy/crawler.py", line 7, in <module>
    from twisted.internet import reactor, defer
  File "/Library/Python/2.7/site-packages/twisted/internet/reactor.py", line 38, in <module>
    from twisted.internet import default
  File "/Library/Python/2.7/site-packages/twisted/internet/default.py", line 56, in <module>
    install = _getInstallFunction(platform)
  File "/Library/Python/2.7/site-packages/twisted/internet/default.py", line 50, in _getInstallFunction
    from twisted.internet.selectreactor import install
  File "/Library/Python/2.7/site-packages/twisted/internet/selectreactor.py", line 18, in <module>
    from twisted.internet import posixbase
  File "/Library/Python/2.7/site-packages/twisted/internet/posixbase.py", line 18, in <module>
    from twisted.internet import error, udp, tcp
  File "/Library/Python/2.7/site-packages/twisted/internet/tcp.py", line 28, in <module>
    from twisted.internet._newtls import (
  File "/Library/Python/2.7/site-packages/twisted/internet/_newtls.py", line 21, in <module>
    from twisted.protocols.tls import TLSMemoryBIOFactory, TLSMemoryBIOProtocol
  File "/Library/Python/2.7/site-packages/twisted/protocols/tls.py", line 63, in <module>
    from twisted.internet._sslverify import _setAcceptableProtocols
  File "/Library/Python/2.7/site-packages/twisted/internet/_sslverify.py", line 38, in <module>
    TLSVersion.TLSv1_1: SSL.OP_NO_TLSv1_1,
AttributeError: 'module' object has no attribute 'OP_NO_TLSv1_1'

아래 명령을 수행하면 해결된다. 

MacBookPro:~|⇒  sudo pip install Twisted==16.4.1

reference 

https://stackoverflow.com/questions/42225773/install-scrapy-on-mac-successful-but-run-error