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← Revision 7 as of 2021-11-20 22:05:16 ⇥
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| = System Installation = | = Python Installation = |
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| == Arch == | '''Python''' is a scripting language that is unfortunately used as a systems language. <<TableOfContents>> ---- == Windows == ---- == macOS == `brew` ---- == Linux == === Arch Linux === On '''Arch Linux''' systems, `python` points to the most recent version. Older versions are available on the AUR as `python37`, `python36`, `python26`, etc. Major libraries are offered as packages and should be preferred over [[Python/Pip|manual installation]]. |
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| # or, sudo pacman -Syyu python2 python2-pip python2-setuptools | |
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Older versions are available on the AUR as `python37`, `python36`, `python26`, etc. |
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| == Debian == | === Debian === On '''Debian''' systems, use `python3` rather than `python`. This operating system supported (and used) both Python 2 and Python 3 for an extended period of time, leading to widespread use of shebang lines as the method of dispatching to the correct executable. Debian vendors Python heavily. Namely, they patch out the `ensurepip` module to enforce `apt` package control. |
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| # or, sudo apt install python python-virtualenv python-venv python-setuptools python-pip | |
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Debian patches out the `ensurepip` module to enforce `apt` package control. |
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| == Ubuntu == | === Ubuntu === |
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| A default version of Python should work out-of-the-box. For alternate versions, use the deadsnakes PPA: | '''Ubuntu''' inherits the problems of Debian. The deadsnakes PPA provides alternate versions of Python with versioned names. |
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| sudo apt install python#.# | sudo apt install python3.8 |
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| = Environment Setup = == Python Path == |
== Configuration == |
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Python has the ability to import modules from a zip archive, if the file's path is on `$PATH`. |
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| == Pip == Packages installed globally are found in `/usr/lib/python#.#/site-packages`; packages installed for a user are found in `~/.local/lib/python#.#/site-packages`. Virtual environments created by pipx are found in `~/.local/pipx`; executables are installed to `~/.local/bin`. These are configurable by `$PIPX_HOME` and `PIPX_BIN_DIR` respectively. Pip will noisily complain about the format of its output changing years ago. To suppress the complaint, explicitly set the default behavior: {{{ export PIP_FORMAT=columns }}} |
Python Installation
Python is a scripting language that is unfortunately used as a systems language.
Windows
macOS
brew
Linux
Arch Linux
On Arch Linux systems, python points to the most recent version. Older versions are available on the AUR as python37, python36, python26, etc.
Major libraries are offered as packages and should be preferred over manual installation.
sudo pacman -Syyu python python-pip python-setuptools
Debian
On Debian systems, use python3 rather than python. This operating system supported (and used) both Python 2 and Python 3 for an extended period of time, leading to widespread use of shebang lines as the method of dispatching to the correct executable.
Debian vendors Python heavily. Namely, they patch out the ensurepip module to enforce apt package control.
sudo apt install python3 python3-virtualenv python3-venv python3-setuptools python3-pip
Ubuntu
Ubuntu inherits the problems of Debian. The deadsnakes PPA provides alternate versions of Python with versioned names.
sudo add-apt-repository ppa:deadsnakes/ppa sudo apt-get update sudo apt install python3.8
Configuration
The python interpretor looks for modules on $PATH, appending its own libraries. Additional appends can be set in $PYTHONPATH.
A startup script can be set with $PYTHONSTARTUP.