Typo on command ("pip3 install -") line causes cascading exceptions #5147
Description
- Pip version: pip 10.0.0b2 from /Users/guido/v37/lib/python3.7/site-packages/pip (python 3.7)
- Python version: anything between 3.3 and 3.7
- Operating system: Mac
Description:
I made a typo on the command line and accidentally ran pip3 install -. I expected a nice error message. Instead I got one, but in addition I got two tracebacks.
What I've run:
$ pip3 install -
Invalid requirement: '-'
Traceback (most recent call last):
File "/Users/guido/v37/lib/python3.7/site-packages/pip/_vendor/packaging/requirements.py", line 93, in __init__
req = REQUIREMENT.parseString(requirement_string)
File "/Users/guido/v37/lib/python3.7/site-packages/pip/_vendor/pyparsing.py", line 1632, in parseString
raise exc
File "/Users/guido/v37/lib/python3.7/site-packages/pip/_vendor/pyparsing.py", line 1622, in parseString
loc, tokens = self._parse( instring, 0 )
File "/Users/guido/v37/lib/python3.7/site-packages/pip/_vendor/pyparsing.py", line 1379, in _parseNoCache
loc,tokens = self.parseImpl( instring, preloc, doActions )
File "/Users/guido/v37/lib/python3.7/site-packages/pip/_vendor/pyparsing.py", line 3395, in parseImpl
loc, exprtokens = e._parse( instring, loc, doActions )
File "/Users/guido/v37/lib/python3.7/site-packages/pip/_vendor/pyparsing.py", line 1379, in _parseNoCache
loc,tokens = self.parseImpl( instring, preloc, doActions )
File "/Users/guido/v37/lib/python3.7/site-packages/pip/_vendor/pyparsing.py", line 3717, in parseImpl
return self.expr._parse( instring, loc, doActions, callPreParse=False )
File "/Users/guido/v37/lib/python3.7/site-packages/pip/_vendor/pyparsing.py", line 1379, in _parseNoCache
loc,tokens = self.parseImpl( instring, preloc, doActions )
File "/Users/guido/v37/lib/python3.7/site-packages/pip/_vendor/pyparsing.py", line 3378, in parseImpl
loc, resultlist = self.exprs[0]._parse( instring, loc, doActions, callPreParse=False )
File "/Users/guido/v37/lib/python3.7/site-packages/pip/_vendor/pyparsing.py", line 1383, in _parseNoCache
loc,tokens = self.parseImpl( instring, preloc, doActions )
File "/Users/guido/v37/lib/python3.7/site-packages/pip/_vendor/pyparsing.py", line 2689, 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 "/Users/guido/v37/lib/python3.7/site-packages/pip/_internal/req/req_install.py", line 252, in from_line
req = Requirement(req)
File "/Users/guido/v37/lib/python3.7/site-packages/pip/_vendor/packaging/requirements.py", line 97, in __init__
requirement_string[e.loc:e.loc + 8]))
pip._vendor.packaging.requirements.InvalidRequirement: Invalid requirement, parse error at "'-'"
$