CODEWITHSUNDEEP
pythonpath
Arturo
Arturo

Reputation: 3779

Installed python 2.7.3 and all my libraries are on python 2.6.

I installed version 2.7.3, and whenever I type:

import numpy

I get an error message saying I don't have it installed. but when I run python 2.6, it imports it beautifully. The same happens with all my previous libraries : scipy, numpy, cv,cv2, networkx. I think it has to do with switching the python library path for the new default version. How do I do this?

Upvotes: 3

Views: 4436

Answers (4)

Jorge Lopez
Jorge Lopez

Reputation: 69

I had this problem for CentOS 6, as it uses python 2.6 for the system and Yum depends on it. My workaround was to temporarily rename the /usr/bin/python binary to something else (e.g., /usr/bin/orig-python). Then I made a link to the python 2.7 installation:

ln -s /usr/local/bin/python2.7 /usr/bin/python

And voilà, it worked perfectly.

This works in case you have a stubborn program that won't take the settings in your $PATH because normally you should be able to execute the correct python if it is configured in your path.

Upvotes: 1

Shep
Shep

Reputation: 8370

If you download the numpy source, untar, and cd to the numpy directory, and type (as root)

python2.7 setup.py install

python 2.7 will install numpy in its own area. Same should apply for the other modules you mention.

The problem is that most installers will just look for python, which is linked to whatever your Ubuntu installation uses by default. In theory you could do something like 

sudo cp -f $(which python2.7) $(which python)

to overwrite this link, but overwriting your system default python installation is a very bad idea and will almost certainly break something.

Upvotes: 1

Kracekumar
Kracekumar

Reputation: 20419

Python sys.path will hold list of path where it needs to look to import a library, in case you are confident that libraries installed in python2.6 will work in python2.7, you need to update sys.path every time you load interpreter.

In case you are using GNU/Linux you can add export PATH=/path/to/py2.6/library:$PATH to ~/.bashrc.

It advised to use pip and install all your libraries in python2.7 .

http://www.pip-installer.org/en/latest/index.html

Since python2.7 and python2.6 are installed, carefully use them while installing libraries.

[EDIT]

$ curl -O https://raw.github.com/pypa/pip/master/contrib/get-pip.py
$ python get-pip.py

and start using pip-2.7 or pip accordingly.

Upvotes: 3

Kien Truong
Kien Truong

Reputation: 11383

You have to install the library separately for each python version. These libraries aren't shared and shouldn't be shared between different version of python.

Upvotes: 4

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