I have both python2.7 and python3.2 installed in Ubuntu 12.04.
 The symbolic link python links to python2.7.
When I type:
sudo pip install package-name   It will default install python2 version of package-name.
Some package supports both python2 and python3.
 How to install python3 version of package-name via pip?
How do I Install a Specific Version of a Python Package? To install a specific version of a Python package you can use pip: pip install YourPackage==YourVersion . For example, if you want to install an older version of Pandas you can do as follows: pip install pandas==1.1. 3 .
Note: On some systems where both Python 2 & Python 3 are installed, pip and pip3 will do different things. pip installs the Python 2 version of the package, and pip3 will install the Python 3 version of the package. it should install all the modules listed on the file.
The current version of pip works on: Windows, Linux and MacOS. CPython 3.7, 3.8, 3.9, 3.10 and latest PyPy3.
Their Python distros don't include pip by default.
Ubuntu 12.10+ and Fedora 13+ have a package called python3-pip which will install pip-3.2 (or pip-3.3, pip-3.4 or pip3 for newer versions) without needing this jumping through hoops.
I came across this and fixed this without needing the likes of wget or virtualenvs (assuming Ubuntu 12.04):
python3-setuptools: run sudo aptitude install python3-setuptools, this will give you the command easy_install3.sudo easy_install3 pip, this will give you the command pip-3.2 like kev's solution.sudo pip-3.2 install <package> (installing python packages into your base system requires root, of course).You may want to build a virtualenv of python3, then install packages of python3 after activating the virtualenv. So your system won't be messed up :)
This could be something like:
virtualenv -p /usr/bin/python3 py3env source py3env/bin/activate pip install package-name 
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