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Python

If you're running Ubuntu 16.04 or later, the first time you try to create a virtual environment with Python 3.6, Python 3.7, Python 3.8 or Python 3.9, you'll get the following error:

python3 -m venv ./venv
The virtual environment was not created successfully because ensurepip is not
available.  On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.

    apt-get install python3-venv

You may need to use sudo with that command.  After installing the python3-venv
package, recreate your virtual environment.

Failing command: ['/home/mystuff/Development/venv/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']

This is because since Python 3.4, ensurepip has been disabled in Ubuntu. There's a long discussion about it on the Ubuntu bug list, but it just boils down to you having to run the following command from the terminal:

sudo apt-get install python3-venv

If you're using PyCharm, you might not see the exact error here but the effect is the same. If you try to run a program and PyCharm starts complaining, this is why.

In either case you just need to follow the instructions in the error message: run the install command above to install python3-venv, recreate the virtual environment and everything will work properly.

Ideally, do this and check it before you start a timed coding challenge that's part of a job interview process. Don't ask me how I know this...