Easily create HTML webviewers in python utilizing the wry library. Unlike many HTML viewers that exist for Python - Pywry allows you to run javacsript. PyWry is also a ~2mb footprint for Mac and Windows - Linux will require a few more libraries which are listed below.
Please note: this library is currently in early alpha and is NOT ready for production use.
PyWry is available on PyPI and can be installed with pip:
pip install pywryFor development, you can install from source with the following steps:
- Clone the repository:
git clone https://github.com/OpenBB-finance/pywry.git - Install rust:
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh - Create a virtual environment:
python -m venv venv - Acitvate the environment:
source venv/bin/activate(Unix) orvenv\Scripts\activate(Windows) - Install dependencies:
pip install .[dev] - Build the pip package:
maturin build - Install the package:
pip install [file path from above] --force-reinstall
import asyncio
import sys
from pywry import PyWry
async def main_loop():
while True:
await asyncio.sleep(1)
if __name__ == "__main__":
try:
handler = PyWry()
handler.send_html("<h1 style='color: red;'>Welcome to PyWry!</h1>")
handler.start()
# PyWry creates a new thread for the backend,
# so we need to run the main loop in the main thread.
# otherwise, the program will exit immediately.
handler.loop.run_until_complete(main_loop())
except KeyboardInterrupt:
print("Keyboard interrupt detected. Exiting...")
sys.exit(0)PyWry uses a JSON object to communicate between the python and rust backends and the javascript frontend. The following keys are available:
| Key | Type | Description |
|---|---|---|
html_str |
str |
The HTML string to be rendered. |
html_path |
Union[str, Path] |
The path to the HTML file to be rendered. |
title |
str |
The title of the window. |
icon |
Union[str, Path] |
The path to png icon to be used for the window. |
json_data |
Union[str, dict] |
A JSON string or dictionary to be passed to the javascript frontend. (see below) |
height |
int |
The height of the window. |
width |
int |
The width of the window. |
download_path |
Union[str, Path] |
The path to the download directory. |
PyWry allows you to run javascript in the frontend. To do this, you can pass a dictionary
of data to the json_data key in the send_html method. This dictionary will be converted
to a JSON string and passed to the frontend. You can then access this data in the frontend
by using the window.json_data object. For example:
from pathlib import Path
# code from above ...
# change send_html line to:
handler.send_html(
html_path=Path(__file__).parent / "index.html", json_data={"name": "PyWry"}
)<html>
<head>
<script>
window.onload = () => {
// if you passed a JSON string, you will need to parse it first
if (typeof window.json_data === "string") {
window.json_data = JSON.parse(window.json_data);
}
document.getElementById("name").innerHTML = window.json_data.name;
};
</script>
</head>
<body>
<h1 style='color: red;'>Hello, <span id="name"></span>!</h1>
</body>
</html>All platforms use TAO to build the window, and wry re-exports it as an application module. Here is the underlying web engine each platform uses, and some dependencies you might need to install.
Tao uses gtk-rs and its related libraries for window creation and wry also needs WebKitGTK for WebView. So please make sure the following packages are installed:
sudo pacman -S webkit2gtksudo apt install libwebkit2gtk-4.0-devsudo dnf install gtk3-devel webkit2gtk3-develWebKit is native to macOS, so no additional dependencies are needed.
WebView2 provided by Microsoft Edge Chromium is used. So wry supports Windows 7, 8, 10 and 11.
This is a known issue with the gio library. You can fix it by installing the libglib2.0-dev package.
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