Re: [Pyparsing] Problems when installing version 2.0.0 using pip

[<pt...@au...>]

Alvaro -

Unfortunately this is the best I can offer. We are in the awkward in-between Python2-or-Python3 compatibility period, which is likely to last a few more years at least. My previous approach to handling the version dichotomy was error-prone, and I finally decided to just move forward to Python 3 as my main supported Python version. Starting with 2.0.1, I will start converting over the supporting code and examples to be more Python3 idiomatic - this of course will not affect the 1.5.x branch of pyparsing. Fortunately both pip and easy_install offer a command syntax to explicitly request a particular version of pyparsing, so Python 2 users do have a not-too-terrible workaround for the default behavior of installing the latest version of a package.

-- Paul


---- "Álvaro Justen [Turicas]" <alv...@gm...> wrote: 
> El 27/02/2013 06:01, "Paul McGuire" <pt...@au...> escribió:
>
> Can you precede your install of pydot with:
>
>     pip install pyparsing==1.5.7

Yes, I know I can do it, but sincerely I don't want to since my library
does not depends directly on pyparsing.

> Hopefully this will explicitly load the Python2-compatible version of
pyparsing, and then pydot won't need to try to autoresolve it.

*Seriously* that you will break everything that needs pyparsing and uses
Python 2?

> -- Paul
>
>
> -----Original Message-----
> From: Álvaro Justen [Turicas] [mailto:alv...@gm...]
> Sent: Wednesday, February 27, 2013 2:33 AM
> To: pyp...@li...
> Subject: [Pyparsing] Problems when installing version 2.0.0 using pip
>
> Hello,
>
> I'm developing a project[https://github.com/NAMD/pypelinin] that uses
python-graph-dot[https://pypi.python.org/pypi/python-graph-dot], which
depends on pyparsing.
> I figured out that you released version 2.0.0 some hours ago because I
tried to package my library to test some stuff and the installation process
failed by a SyntaxError when pip was trying to install pyparsing.
>
> I'm using Python 2.7.3 and all the log can be found at:
> https://gist.github.com/turicas/5046284
>
> Basically, the SyntaxError exception is raised on file "pyparsing.py",
line 629 ("nonlocal limit,foundArity").
> To reproduce this problem you just need to install it in a new virtualenv:
>
>     cd /tmp
>     virtualenv pyparsing-test
>     source pyparsing-test/bin/activate
>     pip install python-graph-dot
>     deactivate
>     rm -rf pyparsing-test
>
> Is there any plans on fixing this problem? I'm considering removing
python-graph-dot dependency in my library for now because I simply can't
install it because of this bug.
>
> Thanks,
> []s
> --
>  Álvaro Justen "Turicas"
>    http://blog.justen.eng.br http://twitter.com/turicas
>    http://CursoDeArduino.com.br http://github.com/turicas
>    +55 21 9898-0141
>
>
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