Here I have media-gfx/pydot-1.0.28-r1, dev-tex/dot2tex-2.8.7 and the subject dev-python/pyparsing installed. media-gfx/pydot provides dot_parser.py and dev-tex/dot2tex provides dotparsing.py. From python I get: >>> import dot_parser Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib64/python2.7/site-packages/dot_parser.py", line 25, in <module> from pyparsing import ( nestedExpr, Literal, CaselessLiteral, Word, Upcase, OneOrMore, ZeroOrMore, ImportError: cannot import name _noncomma >>> and >>> from dot2tex import dotparsing Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib64/python2.7/site-packages/dot2tex/__init__.py", line 36, in <module> import dot2tex as d2t File "/usr/lib64/python2.7/site-packages/dot2tex/dot2tex.py", line 47, in <module> import dotparsing File "/usr/lib64/python2.7/site-packages/dot2tex/dotparsing.py", line 26, in <module> from pyparsing import (Literal, CaselessLiteral, Word, Upcase, OneOrMore, ZeroOrMore, ImportError: cannot import name _noncomma >>> The failing line from both dot_parser.py and dotparsing.py includes from pyparsing import ( ..., _noncomma, ... ) _noncomma which is defined as _noncomma = "".join( [ c for c in printables if c != "," ] ) does appear to be present in <dev-python/pyparsing-2.0.1
I can confirm that dev-tex/dot2tex-2.8.7-r1 also breaks with dev-python/pyparsing-2.0.1. And, if I downgrade to dev-python/pyparsing-1.5.6-r2 (or lower), dev-tex/dot2tex-2.8.7-r1 works again.
Created attachment 370546 [details, diff] Set the correct pyparsing dependency for dot2tex, and update the homepage I can confirm the issue and fixed it by masking versions >pyparsing-2 in the Dependencies. Since fauskes.net closed in 2010 [1], i guess the projects homepage is at [2]. [1] http://feeds.feedburner.com/fauskesnetnotebook [2] https://code.google.com/p/dot2tex/
+*pydot-1.0.28-r2 (07 Mar 2014) + + 07 Mar 2014; Justin Lecher <jlec@gentoo.org> pydot-1.0.28-r1.ebuild, + +pydot-1.0.28-r2.ebuild, +files/pydot-1.0.28-pyparsing2fix.patch, + metadata.xml: + Get patch from Fedora to fix compatibility with dev-python/pyparsing-2.0.1, + #490426 +
This fixes >>> import dot_parser but >>> from dot2tex import dotparsing still fails for the same above reason. This has been reported upstream https://code.google.com/p/dot2tex/issues/detail?id=38&colspec=ID%20Type%20Status%20Priority%20Milestone%20Owner%20Stars%20Summary
