https://github.com/59de44955ebd/python-webview2
Lightweight WebView implementation for Python 3.x in Windows 10/11 based on the MS Edge WebView2 runtime (Chrome/Chromium).
https://github.com/59de44955ebd/python-webview2
cef cefypthon chrome chromium edge python python3 webview webview2 windows windows10 windows11
Last synced: 3 days ago
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Lightweight WebView implementation for Python 3.x in Windows 10/11 based on the MS Edge WebView2 runtime (Chrome/Chromium).
- Host: GitHub
- URL: https://github.com/59de44955ebd/python-webview2
- Owner: 59de44955ebd
- Created: 2025-05-03T16:58:02.000Z (7 days ago)
- Default Branch: main
- Last Pushed: 2025-05-04T15:20:34.000Z (6 days ago)
- Last Synced: 2025-05-07T03:52:47.761Z (3 days ago)
- Topics: cef, cefypthon, chrome, chromium, edge, python, python3, webview, webview2, windows, windows10, windows11
- Language: C++
- Homepage:
- Size: 1.91 MB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# python-webview2
python-webview2 is a WebView implementation for Python 3.x in Windows 10/11 based on the [MS Edge WebView2 runtime](https://developer.microsoft.com/en-us/microsoft-edge/webview2) (i.e. Chrome/Chromium). It's a lightweight (about 200 KB) alternative for (outdated) [cefpython3](https://pypi.org/project/cefpython3/). As far as I know the Edge runtime is preinstalled in any Windows 11 and fully updated Windows 10 system, and can be installed manually in older Windows 10 systems.
python-webview2 is implemented as binary Python extension module (.pyd) and based on this [webview library](https://github.com/webview/webview) written in C/C++.
## Installation
Copy the appropriate webview2.cp...-win_....pyd file into the DLLs folder of your local Python installation, done.
## Examples
*The [examples](examples/) folder also contains demos for using python-webview2 with [wxWidgets](https://pypi.org/project/wxPython/) or with the plain [WinAPI](https://en.wikipedia.org/wiki/Windows_API) and [ctypes](https://en.wikipedia.org/wiki/Windows_API).*
### 1.) Binding: Call from JS into Python, return result to JS
```python
import webview2
webview = webview2.WebView()
webview.set_html('''
Expression:
Evaluate in Python
Result:
document.getElementById('btn').addEventListener("click", async () => {
document.getElementById('res').value = await __py_eval__(document.getElementById('inp').value);
});
''')
def python_eval(id, args):
try:
expression = eval(args)[0] # quick & dirty, better use json.loads
webview.js_return(id, 0, str(eval(expression)))
except Exception as e:
webview.js_return(id, 0, f'"Error: {e}"') # quick & dirty, better use json.dumps
webview.js_bind("__py_eval__", python_eval)
webview.run()
```
### 2.) Minimal Map Viewer Demo (Standalone)
```python
import os
import webview2
APP_DIR = os.path.dirname(os.path.realpath(__file__))
webview = webview2.WebView(
width = 1024, height = 768,
icon = os.path.join(APP_DIR, "resources", "main.ico"),
title = "WebView2 Map Demo (Standalone)",
url = "https://59de44955ebd.github.io/map/",
debug = True,
)
webview.js_bind("__on_fs__", lambda id, args: webview.set_fullscreen(eval(args)[0]))
webview.js_eval("""
document.addEventListener(
'fullscreenchange',
() => __on_fs__(+!map._isFullscreen)
)
""")
webview.run()
```
### 3.) Minimal Map Viewer Demo ([PyQt5](https://pypi.org/project/PyQt5/), [PyQt6](https://pypi.org/project/PyQt6/) or [PySide6](https://pypi.org/project/PySide6/))
```python
import os
import webview2
from PyQt5.QtWidgets import QApplication, QMainWindow
# from PyQt6.QtWidgets import QApplication, QMainWindow
# from PySide6.QtWidgets import QApplication, QMainWindow
APP_DIR = os.path.dirname(os.path.realpath(__file__))
class Main(QMainWindow):
def __init__(self):
super().__init__()
self.webview = webview2.WebView(
window = int(self.winId()),
autosize = True,
icon = os.path.join(APP_DIR, "resources", "main.ico"),
title = "WebView2 Map Demo (PyQt/PySide)",
url = "https://59de44955ebd.github.io/map/",
debug = True,
)
self.webview.js_bind("__on_fs__",
lambda id, args: self.webview.set_fullscreen(eval(args)[0]))
self.webview.js_eval("""
document.addEventListener(
'fullscreenchange',
() => __on_fs__(+!map._isFullscreen)
)
""")
self.resize(1024, 768)
self.show()
def closeEvent(self, e):
self.webview.terminate()
def run(self):
self.webview.run()
if __name__ == "__main__":
app = QApplication([])
main = Main()
main.run()
```
## API
```
webview2.WebView(autosize=False, debug=False, height=240, icon=None, title=None, url=None, width=320, window=None)
```
Constructor, create a WebView instance, either as standalone window or embedded into an existing window.
Parameters:
* autosize (bool) - Embedded mode only: If True, WebView resizes automatically to the parent window's client rect
* debug (bool) - If True, the DevTools (Console etc.) are available (F12)
* height (int) - Initial height of the WebView
* icon (str) - Standalone mode only: path to .ico file used as window icon
* title (str) - Standalone mode only: window title
* url (str) - URL to load (same as calling navigate(url))
* width (int) - Initial width of the WebView
* window (int): - Handle (HWND) of existing window in which WebView is embedded
```
.get_native_handle(kind)
```
Get a native handle (HWND) of choice.
Parameters:
* kind (int) - See constants
```
.js_bind(name, fn)
```
Bind a function pointer to a new global JavaScript function.
Parameters:
* name (str) - Name of the JS function.
* fn (function) - Callback function
```
.js_eval(js)
```
Evaluate arbitrary JavaScript code. Use bindings if you need to communicate the result of the evaluation.
Parameters:
* js (str) - The JavaScript code to evaluate
```
.js_init(js)
```
Inject JavaScript code to be executed immediately upon loading a page. The code will be executed before window.onload.
Parameters:
* js (str) - The JavaScript code to inject
```
.js_return(id, status, result)
```
Respond to a binding call from the JS side.
Parameters:
* id (str) - The identifier of the binding call.Pass along the value received in the binding handler(see webview_bind()).
* status (int) -- A status of zero tells the JS side that the binding call was successful; any other value indicates an error.
* result (str) - The result of the binding call to be returned to the JS side. This must either be a valid JSON value or an empty string for the primitive JS value undefined.
```
.js_unbind(name)
```
Remove a binding created with bind().
Parameters:
* name (str) - Name of the JS function.
```
.navigate(url)
```
Navigate webview to the given URL. URL may be a properly encoded data URI.
Parameters:
* url (str)
```
.run()
```
Run the main loop until it's terminated.
```
.set_focus()
```
Set/restore mouse scroll and keyboard focus to webview.
```
.set_fullscreen(fullscreen)
```
Enter/leave fullscreen mode.
Parameters:
* fullscreen (bool)
```
.set_html(html)
```
Load HTML content into the webview.
Parameters:
* html (str)
```
.set_size(width, height, hint=0)
```
Update the size of the WebView.
Parameters:
* width (int) - New width.
* height (int) - New height.
* hint (int) - Size hint (see constants)
```
.set_title(title)
```
Update the title of the native window.
Parameters:
* title (str)
```
.terminate()
```
Stop the main loop.
### Constants
Window size hints
* webview2.HINT_NONE = 0
* webview2.HINT_MIN = 1
* webview2.HINT_MAX = 2
* webview2.HINT_FIXED = 3
Native handle kind.
* webview2.NATIVE_HANDLE_KIND_UI_WINDOW = 0
* webview2.NATIVE_HANDLE_KIND_UI_WIDGET = 1
## Compiling
Compiling the Python extension module (.pyd) requires MS Visual Studio 2017 or later, and the environment variable %PYTHONHOME% must be set and contain the full path to a Python 3.x for Windows installation with "include" and "libs" subfolders.