How to install pip for a specific python version

Question

I have my deployment system running CentOS 6.

It has by default python 2.6.6 installed. So, "which python" gives me /usr/bin/python (which is 2.6.6)

I later installed python3.5, which is invoked as python3 ("which python3" gives me /usr/local/bin/python3)

Using pip, I need to install a few packages that are specific to python3. So I did pip install using:- "sudo yum install python-pip" So "which pip" is /usr/bin/pip.

Now whenever I do any "pip install", it just installs it for 2.6.6. :-(

It is clear that pip installation got tied to python 2.6.6 and invoking pip later, only installs packages for 2.6.6.

How can I get around this issue?

Answer 1

If pip isn't already installed, then first try to bootstrap it from the standard library:

$ python3.5 -m ensurepip --default-pip  

If that still doesn't allow you to run pip:

• Securely Download get-pip.py .
• Run sudo python3.5 get-pip.py .

Now you can use pip3 to install packages for python3.5. For example, try:

$ sudo pip3 install ipython  # isntall IPython for python3.5

Alternatively, as long as the corresponding pip has been installed, you can use pip for a specific Python version like this:

$ python3.5 -m pip install SomePackage  # specifically Python 3.5

---

References:

• Ensure you can run pip from the command line
• work with multiple versions of Python installed in parallel?

Answer 2

I have python 3.6 and 3.8 on my Ubuntu 18.04 WSL machine. Running

sudo apt-get install python3-pip

pip3 install my_package_name

kept installing packages into Python 3.6 dist directories. The only way that I could install packages for Python 3.8 was:

python3.8 -m pip install my_package_name

That installed appropriate package into the Python 3.8 dist package directory so that when I ran my code with python3.8, the required package was available.

Answer 3

Example of how to install pip for a specific python version

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
/opt/local/bin/python2.7 get-pip.py

Script is from official doc: https://pip.pypa.io/en/stable/installing/

Answer 4

On Ubuntu 18.04.1 LTS I wanted to install pip for my second python version (python3) and the following command did the trick for me:

$ sudo apt install python3-pip