[81] pydot depends on pyparsing, the newest version of which is Py3 only about pydot-ng HOT 16 CLOSED

Comment by WJWwood, 2013-03-03T17:02:49Z

Here is the original error output:

https://gist.github.com/wjwwood/5079212

And the related thread I found:

http://sourceforge.net/projects/pyparsing/forums/forum/337293/topic/6481050

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Comment by [email protected], 2013-03-25T17:00:05Z

I came to raise this exact issue.

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Comment by [email protected], 2013-04-26T06:45:36Z

Obvious to the initiated but not to the newbie: The workaround is to install pyparsing < 2.0.0 prior to installing pydot (or a package that depends on pydot.)

$ pip install pyparsing==1.5.7

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Comment by WJWwood, 2013-04-26T09:46:18Z

Thanks I forgot to post the workaround I used.

Shameless bump, in the mean time I would say that pydot version depending on pyparsing would help keep users from hitting this same issue. I would be in favor of dropping the version dependency again after one or more of the major operating systems comes with Python3.x as the default version of Python. Until then its my opinion that we should flip this around and required the Python3 users to get the correct version of pyparsing manually.

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Comment by [email protected], 2013-07-02T01:41:59Z

Also came here to report this issue; but also, have a solution -- since the setup.py is just a python file, could one do something like this?

if python.version >= 3.0:
install_requires = ['pyparsing', 'setuptools']
else:
install_requires = ['pyparsing < 2.0.0', 'setuptools']

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Comment by WJWwood, 2013-07-02T10:09:38Z

I agree that would be a good solution also, either way I know a tonne of people in our community are running into this problem and we have to keep pointing them to this issue...

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Comment by [email protected], 2013-08-03T02:56:41Z

Have things improved since the release of pyparsing 2.0.1 is backward compatible to Python 2.6 and 2.7?

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Comment by WJWwood, 2013-08-03T11:24:33Z

I can now install pydot against pyparsing 2.0.1, but now I get:

>>> import pydot
Couldn't import dot_parser, loading of dot files will not be possible.

Which is probably worth a new ticket here (if there isn't already one), see:

http://stackoverflow.com/questions/15951748/pydot-and-graphviz-error-couldnt-import-dot-parser-loading-of-dot-files-will

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Comment by grizzly.nyo, 2013-08-31T04:37:26Z

in dot_patser.py:

• remove "_noncomma" from the 28
• add the below at line 30 of:
  _noncomma = "".join( [ c for c in printables if c != "," ] )

'_' prefixed variables should be considered private to the module!

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Comment by [email protected], 2014-01-30T08:54:47Z

See http://stackoverflow.com/a/21462609/722624

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Comment by sandro.tosi, 2014-03-11T12:16:15Z

This is the patch i'm about to apply to the Debian package
Attached support-pyparsing-v2.patch (view on Gist)

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Comment by [email protected], 2014-03-12T07:03:09Z

Sandro, thanks for the patch.

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Comment by [email protected], 2014-04-11T07:52:24Z

Is there any possibility of getting a pydot release with sandro.tosi's patch?

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Comment by [email protected], 2014-08-08T11:30:25Z

To clarify, if you look at the last stackoverflow link, there's a fork with the patch applied. But yeah - this is a major issue. Bump?

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Comment by [email protected], 2015-02-24T08:38:21Z

bump

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pydot-ng and pyparsing version it uses works both on Python 2 and 3.

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