Arch Linux

Description: the pip freeze command throws an exception


Additional info:
* python 3.5.2
* pip 8.1.2
pip freeze --local
Exception:
Traceback (most recent call last):
File "/usr/lib/python3.5/site-packages/pip/_vendor/packaging/requirements.py", line 92, in __init__
req = REQUIREMENT.parseString(requirement_string)
File "/usr/lib/python3.5/site-packages/pip/_vendor/pyparsing.py", line 1172, in parseString
raise exc
File "/usr/lib/python3.5/site-packages/pip/_vendor/pyparsing.py", line 1162, in parseString
loc, tokens = self._parse( instring, 0 )
File "/usr/lib/python3.5/site-packages/pip/_vendor/pyparsing.py", line 1028, in _parseNoCache
loc,tokens = self.parseImpl( instring, preloc, doActions )
File "/usr/lib/python3.5/site-packages/pip/_vendor/pyparsing.py", line 2462, in parseImpl
loc, exprtokens = e._parse( instring, loc, doActions )
File "/usr/lib/python3.5/site-packages/pip/_vendor/pyparsing.py", line 1028, in _parseNoCache
loc,tokens = self.parseImpl( instring, preloc, doActions )
File "/usr/lib/python3.5/site-packages/pip/_vendor/pyparsing.py", line 2719, in parseImpl
return self.expr._parse( instring, loc, doActions, callPreParse=False )
File "/usr/lib/python3.5/site-packages/pip/_vendor/pyparsing.py", line 1028, in _parseNoCache
loc,tokens = self.parseImpl( instring, preloc, doActions )
File "/usr/lib/python3.5/site-packages/pip/_vendor/pyparsing.py", line 2445, in parseImpl
loc, resultlist = self.exprs[0]._parse( instring, loc, doActions, callPreParse=False )
File "/usr/lib/python3.5/site-packages/pip/_vendor/pyparsing.py", line 1032, in _parseNoCache
loc,tokens = self.parseImpl( instring, preloc, doActions )
File "/usr/lib/python3.5/site-packages/pip/_vendor/pyparsing.py", line 1823, in parseImpl
raise ParseException(instring, loc, self.errmsg, self)
pip._vendor.pyparsing.ParseException: Expected W:(abcd...) (at char 0), (line:1, col:1)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/lib/python3.5/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2788, in __init__
super(Requirement, self).__init__(requirement_string)
File "/usr/lib/python3.5/site-packages/pip/_vendor/packaging/requirements.py", line 96, in __init__
requirement_string[e.loc:e.loc + 8]))
pip._vendor.packaging.requirements.InvalidRequirement: Invalid requirement, parse error at "'-lxc==0.'"

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/lib/python3.5/site-packages/pip/basecommand.py", line 215, in main
status = self.run(options, args)
File "/usr/lib/python3.5/site-packages/pip/commands/freeze.py", line 85, in run
for line in freeze(**freeze_kwargs):
File "/usr/lib/python3.5/site-packages/pip/operations/freeze.py", line 47, in freeze
dependency_links
File "/usr/lib/python3.5/site-packages/pip/__init__.py", line 264, in from_dist
req = dist.as_requirement()
File "/usr/lib/python3.5/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2562, in as_requirement
return Requirement.parse(spec)
File "/usr/lib/python3.5/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2833, in parse
req, = parse_requirements(s)
File "/usr/lib/python3.5/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2781, in parse_requirements
yield Requirement(line)
File "/usr/lib/python3.5/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2790, in __init__
raise RequirementParseError(str(e))
pip._vendor.pkg_resources.RequirementParseError: Invalid requirement, parse error at "'-lxc==0.'"[/code]

Steps to reproduce:
[code]