A special release for legacy systems

This is a special release only for Windows for legacy systems such as Windows XP and Vista. This release includes Chromium 49.0.2623.110 which is the latest Chromium version that supports WinXP/Vista.

Installation

You can install pypi/cefpython3 package using pip tool. You can also download packages for offline installation available on this GitHub Release page. Command to install with pip:

pip --no-cache-dir install cefpython3==49.0

Please note that if you were previously installing cefpython3 package it is required to use the --no-cache-dir flag, otherwise pip will end up with error message No matching distribution found for cefpython3==49.0. This happens because 49.0 release occured after 57.0 and 66.0 releases.

Support matrix

Thanks to the sponsor

Thanks to Fivestars Loyalty, Inc. for sponsoring this release. Please visit its website: https://www.fivestars.com/ .

Changes and notes for this release

• Update to Chromium 49.0.2623.110 (#460)
• Support for Windows XP SP3 or later (Vista, 7, 8, 10). Chromium requires at least SP3 on WinXP.
• Support for Python 2.7 and 3.4. Python 3.4 is the last version of Python that supports Windows XP.
• There were multiple changes in upstream CEF that are backward incompatible and thus require modifications in your app code. See the Migration Guide document for details.
• Documentation is available in the docs/ directory in the cefpython49-winxp branch
• API reference is available in the api/ directory in the cefpython49-winxp branch
• Examples that were tested and do work fine: hello_world.py, gtk2.py, qt.py pyqt4, qt.py pyside, tutorial.py, screenshot.py, tkinter_.py and wxpython.py (all except gtk3.py which wasn't tested)
• Add snippets in the examples/snippets/ directory
• Update screenshot.py example to pass switches to disable GPU acceleration which is not supported in OSR mode and can cause issues if enabled. Also pass additional Chromium switches to enhance performance. (#463)
• Do not call WindowUtils.OnSize function which can sometimes cause app hanging during window resize event. Call instead the new WindowUtils.UpdateBrowserSize function. Except when you use the pywin32.py example, in such case WindowUtils.OnSize must be called. (#463)
• Known issue: qt.py pyqt4 and gtk2.py examples can sometimes hang app during window resize (rare, but happens from time to time)
• Update unit tests and add OSR unit test
• The cefpython57 branch was used as a base for the cefpython49-winxp branch and thus it comes with all the new build tools, fixes and new examples
• Upstream CEF prebuilt binaries for this release are available in release tagged v49-upstream.

Known issues

• Enter key doesn't work in Developer Tools window in the wxpython.py example. Enter key works fine when running the hello_world.py example, so this is only an issue with wxPython. To resolve it create either a devtools.py script or use remote debugging and open DevTools in a Google Chrome browser. The devtools.py script is basically a hello_world.py example with one change to url, set it to http://127.0.0.1:1234/. In your wxpython app set ApplicationSettings.remote_debugging_port to 1234 and open DevTools popup by executing subprocess.Popen([sys.executable, "devtools.py"]). The "Developer Tools" from mouse context menu won't work, however you can implement a custom context menu in javascript.