pydot and graphviz error: Couldn't import dot_parser, loading of dot files will not be possible

Question

When I run a very simple code with pydot

import pydot
graph = pydot.Dot(graph_type=\'graph\')

for i in range(3):

  edge = pydot.Edge(\"king\", \"lord%d\" %         


        

Answer 1

There is a new package in the pip repo called pydot2 that functions correctly with pyparsing2. I couldn't downgrade my packages because matplotlib depends on the newer pyparsing package.

Note: python2.7 from macports

Answer 2

The solution was not to install pydot from somewhere, but "python-pydot" from official ubuntu repositories.

Answer 3

I also met the problem and my pydot==1.0.28 while pyparsing==2.2.0. I fixed the problem by downloading the newest pydot 1.2.3(tar.gz)from google and then install it offline. When I updated the pydot in ubuntu 14.04, it said the pydot 1.0.28 is the newest version. Therefore I download from the google the 1.2.3 version.

Answer 4

pydot used a private module variable (_noncomma) from pyparsing. The below diff fixes it to use for pyparsing 2.0.1:

diff --git a/dot_parser.py b/dot_parser.py
index dedd61a..138d152 100644
--- a/dot_parser.py
+++ b/dot_parser.py
@@ -25,8 +25,9 @@ from pyparsing import __version__ as pyparsing_version
 from pyparsing import ( nestedExpr, Literal, CaselessLiteral, Word, Upcase, OneOrMore, ZeroOrMore,
     Forward, NotAny, delimitedList, oneOf, Group, Optional, Combine, alphas, nums,
     restOfLine, cStyleComment, nums, alphanums, printables, empty, quotedString,
-    ParseException, ParseResults, CharsNotIn, _noncomma, dblQuotedString, QuotedString, ParserElement )
+    ParseException, ParseResults, CharsNotIn, dblQuotedString, QuotedString, ParserElement )

+_noncomma = "".join( [ c for c in printables if c != "," ] )

 class P_AttrList:

Answer 5

On OSX Mavericks the following did the trick... I got the same error but at the bottom there was also a complaint that the graphviz executable was not present... I think the problem was i had installed graphviz prior to the other modules?

brew uninstall graphviz
brew install graphviz

Answer 6

This worked for me (Mac OS X 10.9 with Python 2.7.10 on Anaconda):

conda uninstall pydot

Then,

conda install pydot

Pyparsing is then downgraded (from 2.x to 1.5.7) upon pydot's installation. Future Googlers: this allowed me to install and import Theano correctly.