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" % i) graph.add_edge(edge) vassal_num = 0 for i in range(3): for j in range(2): edge = pydot.Edge("lord%d" % i, "vassal%d" % vassal_num) graph.add_edge(edge) vassal_num += 1 graph.write_png('example1_graph.png')
It prints me the error message:
Couldn't import dot_parser, loading of dot files will not be possible.
I’m using python 2.7.3
Here is Solutions:
We have many solutions to this problem, But we recommend you to use the first solution because it is tested & true solution that will 100% work for you.
pydot >= 1.1:
Answer applicable to
pydot <= 1.0.28:
For anyone else who comes across this, it is due to the changes in pyparsing from 1.x to the 2.x release.
To install pydot using pip, first install the older version of pyparsing:
pip install pyparsing==1.5.7 pip install pydot==1.0.28
If you did not install
pip, but instead used
setup.py, then have a look at this solution to uninstall the package. Thanks @qtips.
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
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:
I forked the pydot repository , applied the Gabi Davar patch and some changes to support python-3. The package is available in the PyPI .
$ sudo pip uninstall pydot
$ sudo pip install pydot2
The solution was not to install pydot from somewhere, but “python-pydot” from official ubuntu repositories.
There are now at least 2 more versions that appear to support PyParsing-2 and Python-3:
- PyDotPlus by Carlos Jenkins with a nice travis buildbot and fancy documentation. However you will need to change its folder name from
site-packages\pydotfor it to work with existing programs that import pydot.
- pydot3k by bmcorser. Sadly, did not work!
- prologic/pydot by James Mills linked to from the official pydot Google code page as …
a branch for Python 3 compatibility
- and here is a working link to David Villa’s pydot2 which works fine:
I had the problem again and my above solution did not work. If that is true for you and you are also using Anaconda on a Mac with El Capitan, try this:
conda install --channel https://conda.anaconda.org/RMG graphviz` conda install --channel https://conda.anaconda.org/RMG pydot
What I did at the end after so many tries from what i saw here (pseudo sequence for it to work for networkx ) :
apt-get remove python-pydot pip install pydotplus apt-get install libcgraph6 apt-get install python-pygraphviz # pip freeze | grep pydot pydotplus==2.0.2 # pip freeze | grep pyparsing pyparsing==2.2.0 # pip freeze | grep graphviz pygraphviz==1.2 # python -c 'import pydotplus' #
This worked for me (Mac OS X 10.9 with Python 2.7.10 on Anaconda):
conda uninstall pydot
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.
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
When other solutions do not work, this is a quick and dirty method to solve the probem:
This example is from python 2.7 on Ubuntu 16.04.
Edit the file python2.7/site-packages/keras/utils/visualize_util.py and comment the code segment below.
if not pydot.find_graphviz(): raise ImportError('Failed to import pydot. You must install pydot' ' and graphviz for `pydotprint` to work.')
find_graphviz() is redundant on newer versions of pydot, and the above call does not work.
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.
You need to downgrade pyparsing from version 2.x to version 1.5.7 to get pydot to work correctly.
For win-64, using Conda, this worked for me:
conda install -c https://conda.anaconda.org/Trentonoliphant pyparsing=1.5.7
I then disabled/uninstalled the 2.x version and reloaded pyparsing in my script:
pyparsing = reload(pyparsing) pydot = reload(pydot)
To check whether you have the right version running:
Note: Use and implement solution 1 because this method fully tested our system.
Thank you 🙂