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

[Álvaro J. [T. <alv...@gm...>]

On Wed, Feb 27, 2013 at 11:51 AM,  <pt...@au...> wrote:
> 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.

You can maintain a version for Python2 and another version for Python3
of the same package, just changing its setup.py to detect which Python
version in running during the installation, like httplib2 does:
https://code.google.com/p/httplib2/source/browse/setup.py

[]s

> -- 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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>



-- 
 Álvaro Justen "Turicas"
   http://blog.justen.eng.br http://twitter.com/turicas
   http://CursoDeArduino.com.br http://github.com/turicas
   +55 21 9898-0141