[Distutils] using pip to install an specific, older version

Chris Jerdonek chris.jerdonek at gmail.com
Tue Apr 3 03:25:46 CEST 2012

On Mon, Apr 2, 2012 at 12:08 PM, Carl Meyer <carl at oddbird.net> wrote:
> Hi Chris,
> On 04/02/2012 12:50 PM, Chris Jerdonek wrote:
>> Hi, I'm trying to use pip to install an older, specific version of a
>> package in PyPI (specifically simplejson v2.0.9):
>> http://pypi.python.org/pypi/simplejson/2.0.9
>> I've tried a few variations of the syntax below, but it always seems
>> to install the newest version (v2.5.0).  I don't know if this is an
>> issue with simplejson, how I'm using pip, or something else.  Based on
>> the below, can anyone say why it's not working and how to correct the
>> behavior?
>> Thanks,
>> --Chris
>>> sudo pip freeze -E /opt/local/bin/python
>> nose==1.1.2
>>> sudo pip install -E /opt/local/bin/python 'simplejson<2.1.0'
>> Downloading/unpacking simplejson<2.1.0
>>   Running setup.py egg_info for package simplejson
>> Installing collected packages: simplejson
>>   Running setup.py install for simplejson
>>       File "/opt/local/lib/python2.4/site-packages/simplejson/encoder.py",
>> line 398
>>         if (not _bigint_as_string or
>>          ^
>>     SyntaxError: invalid syntax
>> Successfully installed simplejson
>> Cleaning up...
>>> sudo pip freeze -E /opt/local/bin/python
>> nose==1.1.2
>> simplejson==2.5.0
>>> python -V
>> Python 2.4.6
>>> which python
>> /opt/local/bin/python
>>> which pip
>> /usr/local/bin/pip
> I can't replicate this; when I "pip install 'simplejson<2.1.0'" I get
> 2.0.9. The most likely cause is if you have a build/ directory in your
> current working dir with an already-unpacked simplejson 2.5.0 in it;
> there's a known bug in pip that causes it to not check the version if it
> finds an already-unpacked source.

Thanks, Carl.  Good intuition!  That was the case for me.  Thanks also
for the information regarding -E and virtualenv.  I will start using
that approach.


> Also, you may want to be aware that the -E flag is deprecated and is
> already removed in the latest pip release (1.1) because it does not
> handle isolated virtualenvs correctly. Instead, create a virtualenv and
> use the pip that is automatically installed inside it (virtualenv
> path/to/venv && path/to/venv/bin/pip install simplejson).
> Carl
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