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165 lines
4.7 KiB
Markdown
165 lines
4.7 KiB
Markdown
Python
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======
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Enables local Python and local Python package installation.
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Settings
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--------
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This module supports virtual environments from conda and virtualenvwrapper. By
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default, only virtualenvwrapper is enabled. To disable virtualenvwrapper, add
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the following to *zpreztorc*.
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```sh
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zstyle ':prezto:module:python' skip-virtualenvwrapper-init 'on'
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```
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Conda support is enabled by adding the following to *zpreztorc*.
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```sh
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zstyle ':prezto:module:python' conda-init 'on'
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```
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Caution: using conda and virtualenvwrapper at the same time may cause conflicts.
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Local Python Installation
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-------------------------
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[pyenv][4] builds and installs multiple Python versions locally in the home
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directory.
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This module prepends the pyenv directory to the path variable to enable the
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execution of `pyenv`.
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### Usage
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Install Python versions with `pyenv install` into `~/.pyenv/versions`.
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This will be loaded automatically if pyenv is installed to `$PYENV_ROOT`,
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`~/.pyenv`, or if the `pyenv` command is on the path.
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Local Package Installation
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--------------------------
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Since version 2.6, Python supports per user package installation, as defined in
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[PEP 370][1].
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This module prepends per user site directories to the relevant path variables
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to enable the execution of user installed scripts and the reading of
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documentation.
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### Usage
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Install packages into the per user site directory with `pip install --user`.
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virtualenvwrapper
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-----------------
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[`virtualenvwrapper`][2] is a frontend to the popular [`virtualenv`][3] utility.
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`virtualenv` creates isolated Python environments and `virtualenvwrapper`
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provides convenient shell functions to create, switch, and manage them.
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### Usage
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Install `virtualenvwrapper`.
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Virtual environments are stored in `~/.virtualenvs`.
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There are configuration variables that have to be set to enable certain features.
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If you wish to use these features, export the variables in [`zshenv`][6].
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The variable `$PROJECT_HOME` tells `virtualenvwrapper` where to place project
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working directories. It must be set and the directory created before `mkproject`
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is used. Replace *Developer* with your projects directory.
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```sh
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export PROJECT_HOME="$HOME/Developer"
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```
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The variable `VIRTUALENVWRAPPER_PYTHON` tells `virtualenvwrapper` to use the
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specified full path of the `python` interpreter overriding the `$PATH` search.
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```sh
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export VIRTUALENVWRAPPER_PYTHON=/usr/local/bin/python
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```
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The variable `VIRTUALENVWRAPPER_VIRTUALENV` tells `virtualenvwrapper` to use the
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specified full path of `virtualenv` binary overriding the `$PATH` search.
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```sh
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export VIRTUALENVWRAPPER_VIRTUALENV=/usr/local/bin/virtualenv
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```
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The variable `$VIRTUALENVWRAPPER_VIRTUALENV_ARGS` tells `virtualenvwrapper` what
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arguments to pass to `virtualenv`. For example, set the value to
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`--system-site-packages` to ensure that all new environments have access to the
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system site-packages directory.
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```sh
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export VIRTUALENVWRAPPER_VIRTUALENV_ARGS='--system-site-packages'
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```
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### Additional Options
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There is a hook to enable auto-switching to virtualenvs when switching into a
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directory where the root of the project matches a virtualenv name.
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This can be enabled with:
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```sh
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zstyle ':prezto:module:python:virtualenv' auto-switch 'yes'
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```
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`virtualenvwrapper` is automatically initialized if pre-requisites are met
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(`$VIRTUALENVWRAPPER_VIRTUALENV` is explicitly set or `virtualenv` is in
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`$PATH`). This can be disabled with:
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```sh
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zstyle ':prezto:module:python:virtualenv' initialize 'no'
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```
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Aliases
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-------
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- `py` is short for `python`.
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- `py2` is short for `python2`.
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- `py3` is short for `python3`.
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Functions
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---------
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- `python-info` exposes information about the Python environment via the
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`$python_info` associative array.
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Theming
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-------
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To display the name of the current virtual enviroment in a prompt, define the
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following style in the `prompt_name_setup` function.
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# %v - virtualenv name.
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zstyle ':prezto:module:python:info:virtualenv' format 'virtualenv:%v'
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Then add `$python_info[virtualenv]` to `$PROMPT` or `$RPROMPT` and call
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`python-info` in the `prompt_name_preexec` hook function.
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Similarly, you can use `:prezto:module:python:info:version:format` with `%v` for
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the version and add `$python_info[version]` to your prompt for the current
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python version/
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Authors
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-------
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*The authors of this module should be contacted via the [issue tracker][5].*
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- [Sorin Ionescu](https://github.com/sorin-ionescu)
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- [Sebastian Wiesner](https://github.com/lunaryorn)
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[1]: http://www.python.org/dev/peps/pep-0370/
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[2]: http://www.doughellmann.com/projects/virtualenvwrapper/
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[3]: http://pypi.python.org/pypi/virtualenv
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[4]: https://github.com/yyuu/pyenv
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[5]: https://github.com/sorin-ionescu/prezto/issues
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[6]: https://github.com/sorin-ionescu/prezto/blob/master/runcoms/zshenv
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