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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?

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6
  • 2
    Possible duplicate of pip: dealing with multiple Python versions? Commented Feb 21, 2017 at 15:27
  • 2
    Check if you have a program pip3 installed. This downloads python3 versions of packages. Commented Feb 21, 2017 at 15:33
  • I'd recommend looking into virtual environments Commented Feb 21, 2017 at 16:19
  • Each pip is tied to its Python binary. So installation packages using one pip instance will not install packages for other Python versions. Commented Feb 21, 2017 at 22:59
  • How did you your install python3.5? Commented Feb 21, 2017 at 22:59

5 Answers 5

Reset to default
19

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:

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1 Comment

you may need to add sudo before python3.5 -m ensurepip --default-pip
2

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/

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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.

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1 Comment

this does not work
0

I had to pip install a pypi only package (no conda package) in a conda environment - this is how I did it (on a mac, in this case):

/opt/anaconda3/envs/<name of conda environment>/bin/python -m pip install <name of package to install>

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-3

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
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1 Comment

In my case, this was not helpful since it still downloaded python3.6 even though I already had 3.7 installed.

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