Unable to run with pythonw or PyInstaller

[simonrob]

#1029 reported an issue with PyInstaller that was resolved for the original reporter with the logwriter-bottle branch that was merged in #1038.

For me this does not fix the issue, because bottle, which is causing the problem, requires stdout and stderr to exist before it is even imported. On Windows, neither pythonw nor PyInstaller support this.

To replicate without needing PyInstaller, run the pywebview Hello World example with pythonw rather than python. This is a regression since pywebview version 4.0 because of the introduction of bottle.

One fix would be to import bottle after the new DummyLogWriter, and change the hasattr(sys, '_MEIPASS') check in http.py to instead check for stdout and stderr existing (similar to how this used to work in PyInstaller).

The root cause is that bottle, for almost its entire existence until relatively recently, tested for the write method of stdout and stderr, but only caught an IOError, not an AttributeError. This was fixed in 2021, but it doesn't seem like a new PyPi release is coming anytime soon, so most pywebview users will probably have the latest version (0.12.23) that does not include this change.

I'm happy to submit a PR, but thought you might have your own preferred way of resolving things like this that are related to importing dependencies.