"Expected ',' or end-of-list in",line,"at",line[p:]

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Traceback (most recent call last):
  File "/usr/bin/salt-ssh", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 3007, in <module>
    working_set.require(__requires__)
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 728, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 631, in resolve
    requirements.extend(dist.requires(req.extras)[::-1])
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2489, in requires
    dm = self._dep_map
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2483, in _dep_map
    dm.setdefault(extra,[]).extend(parse_requirements(reqs))
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2839, in parse_requirements
    line, p, specs = scan_list(VERSION,LINE_END,line,p,(1,2),"version spec")
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2817, in scan_list
    "Expected ',' or end-of-list in",line,"at",line[p:]
ValueError: ("Expected ',' or end-of-list in", "tornado>=4.2.1,<6.0; python_version < '3'", 'at', "; python_version < '3'")

setuptools版本太老的原因

sudo pip install --upgrade setuptools