I'd like to start off by pointing out that this question may seem like a duplicate but it's not All the questions I saw here on Ask Ubuntu were regarding pip for Python 3 and I'm talking about Python 3.6. The steps used back then don't work for Python 3.6.

  1. I got a clear Ubuntu 16.10 image from the official docker store .
  2. Run apt-get update
  3. Run apt-get install python3.6
  4. Run apt-get install python3-pip
  5. Run pip3 install requests bs4
  6. Run python3.6 script.py

Got ModuleNotFoundError below.

 Traceback (most recent call last):
    File "script.py", line 6, in <module>
     import requests
 ModuleNotFoundError: No module named 'requests'

Python's and pip's i have in the machine.

python3
python3.5
python3.5m
python3.6
python3m
python3-config
python3.5-config
python3.5m-config
python3.6m
python3m-config

pip
pip3
pip3.5
Best Answer


This answer assumes that you have python3.6 installed. For python3.7 , replace 3.6 with 3.7 . For python3.8 , replace 3.6 with 3.8 , but it may also first require the python3.8-distutils package.

Installation with sudo

With regard to installing pip , using curl (instead of wget ) avoids writing the file to disk.

curl https://bootstrap.pypa.io/get-pip.py | sudo -H python3.6

The -H flag is evidently necessary with sudo in order to prevent errors such as the following when installing pip for an updated python interpreter.

The directory '/home/someuser/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.

The directory '/home/someuser/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.

Installation without sudo

curl https://bootstrap.pypa.io/get-pip.py | python3.6 - --user

This may sometimes give you a warning such as

WARNING: The script wheel is installed in '/home/ubuntu/.local/bin' which is not on PATH. Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.

Verification

After this, pip , pip3 , and pip3.6 can all be expected to point to the same target.

$ (pip -V && pip3 -V && pip3.6 -V) | uniq
pip 18.0 from /usr/local/lib/python3.6/dist-packages (python 3.6)

Of course you can alternatively use python3.6 -m pip as well.

$ python3.6 -m pip -V
pip 18.0 from /usr/local/lib/python3.6/dist-packages (python 3.6)