ubuntu 16.04 安装 scrapy 一个花了我5小时的bug最终解决

我积极解决

　　Complete output from command python setup.py egg_info:
    Couldn't find index page for 'incremental' (maybe misspelled?)
    No local packages or download links found for incremental>=16.10.1
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-wIgIGQ/Twisted/setup.py", line 21, in <module>
        setuptools.setup(**_setup["getSetupArgs"]())
      File "/usr/lib/python2.7/distutils/core.py", line 111, in setup
        _setup_distribution = dist = klass(attrs)
      File "build/bdist.linux-x86_64/egg/setuptools/dist.py", line 260, in __init__
      File "build/bdist.linux-x86_64/egg/setuptools/dist.py", line 284, in fetch_build_eggs
      File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 563, in resolve
      File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 799, in best_match
      File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 811, in obtain
      File "build/bdist.linux-x86_64/egg/setuptools/dist.py", line 327, in fetch_build_egg
      File "build/bdist.linux-x86_64/egg/setuptools/command/easy_install.py", line 434, in easy_install
   
      File "build/bdist.linux-x86_64/egg/setuptools/package_index.py", line 475, in fetch_distribution
    AttributeError: 'NoneType' object has no attribute 'clone'
   
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-wIgIGQ/Twisted/


　　最后解决办法：
　　sudo -H pip install --upgrade setuptools 或
　　sudo -H pip install -U setuptools
　　再：
　　sudo -H pip install scrapy
　　尝试过的解决办法：
　　1、sudo -H pip install incremental==16.10.1
2、pip install --upgrade pip
3、换豆瓣原  sudo -H pip install scrapy -i https://pypi.douban.com/simple/