Install Python in Linux OS systems

Pyenv builds Python from source, which means you’ll need build dependencies to actually use it. The build dependencies vary by platform. If you are on Ubuntu/Debian and want to install the build dependencies, you could use the following:

sudo apt-get install -y make build-essential libssl-dev zlib1g-dev \
libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev \
libncursesw5-dev xz-utils tk-dev libffi-dev liblzma-dev python-openssl

After you’ve installed the build dependencies, you’re ready to install pyenv itself. We recommend using the pyenv-installer project:

curl | bash

At the end of the installation you will see something similar to:

WARNING: seems you still have not added 'pyenv' to the load path.

# Load pyenv automatically by adding
# the following to ~/.bashrc:

export PATH="$HOME/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"

Follow the instructions that will appear to add the paths to your /.bashrc file and then start a new shell session.:

exec "$SHELL" # Or just restart your terminal

This command will show a list of Python versions:

pyenv install --list

Now let's install the latest Python version (3.8.5 as of this writing):

pyenv install 3.8.5

Now that Python 3 is installed through pyenv, we want to set it as our global default version for pyenv environments:

$ pyenv global 3.8.5
# and verify it worked
$ pyenv version

Run this command to see the system Python's version after the change:

python -V


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