LiveReload

Reload webpages on changes, without hitting refresh in your browser.

Installation

python-livereload is for web developers who know Python, and is available on PyPI.

$ pip install livereload

Command Line Interface

python-livereload provides a command line utility, livereload, for starting a server in a directory.

By default, it will listen to port 35729, the common port for LiveReload browser extensions.

$ livereload --help
usage: livereload [-h] [-p PORT] [-w WAIT] [directory]

Start a `livereload` server

positional arguments:
  directory             Directory to watch for changes

optional arguments:
  -h, --help            show this help message and exit
  -p PORT, --port PORT  Port to run `livereload` server on
  -w WAIT, --wait WAIT  Time delay before reloading

Older versions of python-livereload used a Guardfile to describe optional additional rules for files to watch and build commands to run on changes. This conflicted with other tools that used the same file for their configuration and is no longer supported since python-livereload 2.0.0. Instead of a Guardfile you can now write a Python script using very similar syntax and run it instead of the command line application.

Developer Guide

The new livereload server is designed for developers. It can power a wsgi application now:

from livereload import Server, shell

server = Server(wsgi_app)

# run a shell command
server.watch('static/*.stylus', 'make static')

# run a function
def alert():
    print('foo')
server.watch('foo.txt', alert)

# output stdout into a file
server.watch('style.less', shell('lessc style.less', output='style.css'))

server.serve()

The Server class accepts parameters:

app: a wsgi application
watcher: a watcher instance, you don’t have to create one

server.watch

server.watch can watch a filepath, a directory and a glob pattern:

server.watch('path/to/file.txt')
server.watch('directory/path/')
server.watch('glob/*.pattern')

You can also use other library (for example: formic) for more powerful file adding:

for filepath in formic.FileSet(include="**.css"):
    server.watch(filepath, 'make css')

You can delay a certain seconds to send the reload signal:

# delay 2 seconds for reloading
server.watch('path/to/file', delay=2)

server.setHeader

`server.setHeader` can be used to add one or more headers to the HTTP response:

server.setHeader('Access-Control-Allow-Origin', '*')
server.setHeader('Access-Control-Allow-Methods', '*')

server.serve

Setup a server with server.serve method. It can create a static server and a livereload server:

# use default settings
server.serve()

# livereload on another port
server.serve(liveport=35729)

# use custom host and port
server.serve(port=8080, host='localhost')

# open the web browser on startup, based on $BROWSER environment variable
server.serve(open_url_delay=5, debug=False)

# set a custom default file to open
server.serve(default_filename='example.html')

shell

The powerful shell function will help you to execute shell commands. You can use it with server.watch:

# you can redirect command output to a file
server.watch('style.less', shell('lessc style.less', output='style.css'))

# commands can be a list
server.watch('style.less', shell(['lessc', 'style.less'], output='style.css'))

# working with Makefile
server.watch('assets/*.styl', shell('make assets', cwd='assets'))

Frameworks Integration

Livereload can work seamlessly with your favorite framework.

Django

For Django there is a management command included.

To use simply

add 'livereload' to your INSTALLED_APPS and
then run ./manage.py livereload.

For available options like host and ports please refer to ./manage.py livereload -h.

To automagically serve static files like the native runserver command you have to use dj-static. (follow the simple instructions there).

Flask

Wrap Flask with livereload is much simpler:

# app is a Flask object
app = create_app()

# remember to use DEBUG mode for templates auto reload
# https://github.com/lepture/python-livereload/issues/144
app.debug = True

server = Server(app.wsgi_app)
# server.watch
server.serve()

Bottle

Wrap the Bottle app with livereload server:

# Without this line templates won't auto reload because of caching.
# http://bottlepy.org/docs/dev/tutorial.html#templates
bottle.debug(True)

app = Bottle()
server = Server(app)
# server.watch
server.serve()

Security Report

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.

GitHub

https://github.com/lepture/python-livereload

Reload webpages on changes, without hitting refresh in your browser