使用scrapy startproject tutorial时，执行错误：

scrapy startproject tutorial Traceback (most recent call last): File "/usr/local/bin/scrapy", line 5, in  from pkg_resources import load_entry_point File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 2603, in  working_set.require(__requires__) File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 666, in require needed = self.resolve(parse_requirements(requirements)) File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 565, in resolve raise DistributionNotFound(req) # XXX put more info here pkg_resources.DistributionNotFound: queue lib

去/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py中查看它的代码， 在565行左右：

while requirements: req = requirements.pop(0) # process dependencies breadth-first if req in processed: # Ignore cyclic or redundant dependencies continue dist = best.get(req.key) if dist is None: # Find the best distribution and add it to the map dist = self.by_key.get(req.key) if dist is None: if env is None: env = Environment(self.entries) dist = best[req.key] = env.best_match(req, self, installer) if dist is None: raise DistributionNotFound(req) # XXX put more info here to_activate.append(dist) if dist not in req: # Oops, the "best" so far conflicts with a dependency raise VersionConflict(dist,req) # XXX put more info here requirements.extend(dist.requires(req.extras)[::-1]) processed[req] = True

不太清楚具体环境哪里错误了，还请各位大神或者有过类似经验的