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Python

Description

Python is a programming language that lets you work quickly and integrate systems more effectively.

Directory

References

Installation

Description

This guide details on how to install both python, the programming language, and pip, Python's package manager.

References

Steps

  1. Install python using pacman (or yay):

    sudo pacman -S python

  2. Install pip using pacman (or yay):

    sudo pacman -S python-pip

    Alternatively, we could also install pip using python itself:

    python -m ensurepip --upgrade

Pip Usage

Description

This guide details on how use pip to perform several operations including installing Python packages.

References

Steps

Note

Replace <package> with the actual name of the package you wish to search, install, or update.

  1. To install a Python package:

    pip install <package>

  2. To upgrade a Python package:

    pip install --upgrade <package>

  3. To uninstall a Python package:

    pip uninstall <package>

  4. To search for a Python package:

    pip search <package>

  5. To list all installed Python packages:

    pip list

  6. To freeze all installed Python packages into a requirements.txt file:

    pip freeze > requirements.txt

  7. To install all Python packages listed in a requirements.txt file:

    pip install -r requirements.txt

Miniconda Environments

Important

A portion of this guide assumes you are using the Fish shell. If you are using a different shell, make any required adjustments accordingly.

Description

This guide details on how we could install, setup, and use Conda to create python environments of various python versions.

References

Steps

  1. Install Miniconda:

    mkdir -p ~/miniconda3
curl -Lo ~/miniconda3/miniconda.sh https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh
bash ~/miniconda3/miniconda.sh -b -u -p ~/miniconda3
rm -f ~/miniconda3/miniconda.sh

  2. Add the Miniconda binary to $PATH temporarily (on fish):

    fish_add_path ~/miniconda3/condabin

  3. Configure Minicondawith the fish shell to have Miniconda available in our $PATH permanently:

    conda init fish

    Doing so should add this (with additional minor modification) to our fish config (i.e. ~/.config/fish/config.fish):

    if status is-interactive
  # >>> conda initialize >>>
  # !! Contents within this block are managed by 'conda init' !!
  if test -f ~/miniconda3/bin/conda
    eval ~/miniconda3/bin/conda "shell.fish" "hook" $argv | source
  end
  # <<< conda initialize <<<
end

  4. Update Conda:

    conda update conda

  5. The default Conda channels might be sufficient, but some packages might be missing (i.e. python <3.5).

    To fix this, add the conda-forge channel like so:

    conda config --append channels conda-forge

  6. Check channels active/available to our Conda to ensure that conda-forge has been added:

    conda config --show channels

    Sample output:

    channels:
  - defaults
  - conda-forge

  7. To create an environment named, myenv, running on python version 3.5:

    conda create --name myenv python=3.5

  8. To activate the environment we created (i.e. myenv) and verify that it is running the python version we had set:

    conda activate myenv
python --version

  9. To exit/deactivate the environment we had activated:

    conda deactivate

  10. To delete an environment (i.e. myenv) permanently:

    conda env remove --name myenv

  11. To list all available Conda environments on our system:

    conda env list

    Sample output:

    # conda environments:
#
base                  *  /home/myuser/miniconda3
myenv                    /home/myuser/miniconda3/envs/myenv

    [!NOTE]
    The * indicates the active environment that we are currently in.