我安装了scrapy，但在执行“scrapy startproject tutorial”时出错

Question

我有以下输出，原因是什么？

    bater:test001 apple$ scrapy startproject tutorial
    Traceback (most recent call last):
      File "/usr/local/bin/scrapy", line 4, in 
        import pkg_resources
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 2603, in 
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 666, in require
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 565, in resolve
    pkg_resources.DistributionNotFound: Scrapy==0.16.1