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SpaceVim/docs/layers/lang/python.md
2017-12-12 07:52:13 +08:00

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Markdown

---
title: "SpaceVim lang#python layer"
description: "This layer is for Python development, provide autocompletion, syntax checking, code format for python file."
---
# [SpaceVim Layers:](https://spacevim.org/layers) lang#python
<!-- vim-markdown-toc GFM -->
- [Description](#description)
- [Features](#features)
- [Install](#install)
- [Layer](#layer)
- [Syntax Checking](#syntax-checking)
- [Buffer formatting](#buffer-formatting)
- [Format imports](#format-imports)
- [Key bindings](#key-bindings)
- [Inferior REPL process](#inferior-repl-process)
- [Running current script](#running-current-script)
- [Testing](#testing)
- [Refactoring](#refactoring)
<!-- vim-markdown-toc -->
## Description
This layer is for Python development.
## Features
- Aoto-completion using [deoplete-jedi](https://github.com/zchee/deoplete-jedi) or [jedi-vim](https://github.com/davidhalter/jedi-vim)
- Documentation Lookup using [jedi-vim](https://github.com/davidhalter/jedi-vim)
## Install
### Layer
To use this configuration layer, add `SPLayer 'lang#python'` to your custom configuration file.
### Syntax Checking
`checker` layer provide syntax checking feature, and for python it uses `flake8` package:
```sh
pip install --user flake8
```
### Buffer formatting
The default key binding for formatting buffer is `SPC b f`, and you need to install `yapf`. To enable automatic buffer formatting on save, load this layer with setting `format-on-save` to `1`.
```sh
pip install --user yapf
```
### Format imports
To be able to suppress unused imports easily, install [autoflake](https://github.com/myint/autoflake):
```sh
pip install --user autoflake
```
To be able to sort your imports, install [isort](https://github.com/timothycrosley/isort)
```sh
pip install --user isort
```
## Key bindings
### Inferior REPL process
Start a Python or iPython inferior REPL process with `SPC l s i`. If `ipython` is available in system executable search paths, `ipython` will be used to launch python shell; otherwise, default `python` interpreter will be used. You may change your system executable search path by activating a virtual environment.
Send code to inferior process commands:
| Key Binding | Description |
| ----------- | ------------------------------------------------ |
| `SPC l s b` | send buffer and keep code buffer focused |
| `SPC l s l` | send line and keep code buffer focused |
| `SPC l s s` | send selection text and keep code buffer focused |
### Running current script
To running a python script, you can press `SPC l r` to run current file without loss focus, and the result will be shown in a runner buffer.
### Testing
### Refactoring
| Key Binding | Description |
| ----------- | ------------------------------------ |
| `SPC l i r` | remove unused imports with autoflake |
| `SPC l i s` | sort imports with isort |