Eel supports two ways of retrieving return values from the other side of the app, which helps keep the code concise. As of Eel v0.12.0, the following options are available to start(): In addition to the files in the frontend folder, a Javascript library will be served at /eel.js. This can be changed with the _js_result_timeout parameter to eel.init. Eel is a little Python library for making simple Electron-like HTML/JS GUI apps. gui, A Hello World example using Microsoft Edge. For some reason many of the best-in-class number crunching and maths libraries are in Python (Tensorflow, Numpy, Scipy etc) but many of the best visualization libraries are in Javascript (D3, THREE.js etc). It is a bit heavy weight for what I wanted. Additional options can be passed to eel.start() as keyword arguments. Eel is a little Python library for making simple Electron-like offline HTML/JS GUI apps, with full access to Python capabilities and libraries.

There are several options for making GUI apps in Python, but if you want to use HTML/JS (in order to use jQueryUI or Bootstrap, for example) then you generally have to write a lot of boilerplate code to communicate from the Client (Javascript) side to the Server (Python) side. For Windows 10 users, Microsoft Edge (eel.start(.., mode='edge')) is installed by default and a useful fallback if a preferred browser is not installed. Eel is designed to take the hassle out of writing short and simple GUI applications.

For most cases you should be fine by avoiding using time.sleep() and instead using the versions provided by gevent. The closest Python equivalent to Electron (to my knowledge) is cefpython. So the equivalent code from the Javascript side would be: Eel is built on Bottle and Gevent, which provide an asynchronous event loop similar to Javascript.

Work fast with our official CLI. While we want to think of our code as comprising a single application, the Python interpreter and the browser window run in separate processes. The closest Python equivalent to Electron (to my knowledge) is cefpython. Wie Sie Bedingungen in Python richtig nutzen können, erfahren Sie in diesem Praxistipp. Eel supports two ways of retrieving return values from the other side of the app, which helps keep the code concise. Suppose you put all the frontend files in a directory called web, including your start page main.html, then the app is started like this; This will start a webserver on the default settings (http://localhost:8000) and open a browser to http://localhost:8000/main.html. Download the file for your platform. The exposed name can also be overridden by passing in a second argument. See full example in: examples/01 - hello_world. example, we have a short HTML page, web/hello.html: If we run the Python script (python hello.py), then a browser window will open displaying hello.html, and we will see... ...in the browser console (press F12 to open). All the frontend files should be put in a single directory (they can be further divided into folders inside this if necessary). As of Eel v0.12.0, the following options are available to start(): In addition to the files in the frontend folder, a Javascript library will be served at /eel.js.

So the equivalent code from the Javascript side would be: Eel is built on Bottle and Gevent, which provide an asynchronous event loop similar to Javascript. For most cases you should be fine by avoiding using time.sleep() and instead using the versions provided by gevent. To include support for HTML templating, currently using Jinja2: An Eel application will be split into a frontend consisting of various web-technology files (.html, .js, .css) and a backend consisting of various Python scripts. Monkey patching can interfere with things like debuggers so should be avoided unless necessary. In these cases it is more convenient to just synchronously wait a few milliseconds then continue with your code, rather than breaking the whole thing up into callbacks. To prevent hanging forever on the Python side, a timeout has been put in place for trying to retrieve values from Make a suggestion. While we want to think of our code as comprising a single application, the Python interpreter and the browser window run in separate processes. See full example in: examples/01 - hello_world. example, we have a short HTML page, web/hello.html: If we run the Python script (python hello.py), then a browser window will open displaying hello.html, and we will see... ...in the browser console (press F12 to open). // Inside a function marked 'async' we can use the 'await' keyword. the JavaScript side, which defaults to 10000 milliseconds (10 seconds). For example, if we have the following function defined and exposed in Javascript: Then in Python we can retrieve random values from the Javascript side like so: (It works exactly the same the other way around). Core Python does not provide switch or case statements as in other languages, but we can use if..elif...statements to simulate switch case as follows − Example. Eel hosts a local webserver, then lets you annotate functions in Python so that they can be called from Javascript, and vice versa. Learn more. This can make communicating back and forth between them a bit of a mess, especially if we always had to explicitly send values from one side to the other.

Monkey patching can interfere with things like debuggers so should be avoided unless necessary. When you call an exposed function, you can immediately pass a callback function afterwards. If nothing happens, download GitHub Desktop and try again. pre-release. This monkey patching is done automatically when you call import eel. So in Python we would write: You can only perform synchronous returns after the browser window has started (after calling eel.start()), otherwise obviously the call with hang. You should include this in any pages: Including this library creates an eel object which can be used to communicate with the Python side. Eel hosts a local webserver, then lets you annotate functions in Python so that they can be called from Javascript, and vice versa. © 2020 Python Software Foundation For example, if we have the following function defined and exposed in Javascript: Then in Python we can retrieve random values from the Javascript side like so: (It works exactly the same the other way around). Code is Open Source under AGPLv3 license Eel is a little Python library for making simple Electron-like offline HTML/JS GUI apps, with full access to Python capabilities and libraries. Suppose you put all the frontend files in a directory called web, including your start page main.html, then the app is started like this; This will start a webserver on the default settings (http://localhost:8000) and open a browser to http://localhost:8000/main.html.

All the frontend files should be put in a single directory (they can be further divided into folders inside this if necessary). 'chrome'), the port the app runs on, the host name of the app, and adding additional command line flags. There are several options for making GUI apps in Python, but if you want to use HTML/JS (in order to use jQueryUI or Bootstrap, for example) then you generally have to write a lot of boilerplate code to communicate from the Client (Javascript) side to the Server (Python) side. If Chrome or Chromium is installed then by default it will open in that in App Mode (with the --app cmdline flag), regardless of what the OS's default browser is set to (it is possible to override this behaviour). // This calls the Python function that was decorated, , # Set web files folder and optionally specify which file types to check for eel.expose(), # *Default allowed_extensions are: ['.js', '.html', '.txt', '.htm', '.xhtml'], # Call Javascript function, and pass explicit callback function, # Do the same with an inline lambda as callback. ...we would then have three "threads" (greenlets) running; If you want to package your app into a program that can be run on a computer without a Python interpreter installed, you should use PyInstaller. the JavaScript side, which defaults to 10000 milliseconds (10 seconds). This monkey patching is done automatically when you call import eel. Libraries.io helps you find new open source packages, modules and frameworks and keep track of ones you depend upon.

This used for creating GUI's in a Chrome app window with HTML, CSS and JS. Putting this together into a Hello, World! Consult the documentation for PyInstaller for more options. This callback will automatically be called asynchrounously with the return value when the function has finished executing on the other side.

For Windows 10 users, Microsoft Edge (eel.start(.., mode='edge')) is installed by default and a useful fallback if a preferred browser is not installed. There is no corresponding timeout on the JavaScript side.

If you need monkey patching you should import gevent.monkey and call gevent.monkey.patch_all() before you import eel.