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Shaperilio/qtgui fixes (#13957)...
Shaperilio/qtgui fixes (#13957) I started using the released version of my `PySide6`-enabling changes and noted some problems. In this PR, I fix those, and also overall improve the feedback to the user when a GUI event loop is hooked in: - Report which event loop is running when using `%gui <some GUI>`; e.g. `%gui qt` will show `Installed qt6 event loop hook.` - Report when the event loop is disabled; i.e. `%gui` will show `GUI event loop hook disabled.` if an event loop hook was installed, or `No event loop hook running.` if nothing was installed. - Requesting a second event loop will give the message `Shell is already running a gui event loop for <some GUI>. Call with no arguments to disable current loop.` - Requesting a different version of Qt, i.e. `%gui qt6` followed by `%gui` followed by `%gui qt5` will show `Cannot switch Qt versions for this session; will use qt6.` followed by `Installed qt6 event loop hook.` (Fixes / improves #13864)

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IPython provides a rich toolkit to help you make the most out of using Python interactively. Its main components are:

  • A powerful interactive Python shell
  • A Jupyter kernel to work with Python code in Jupyter notebooks and other interactive frontends.

The enhanced interactive Python shells have the following main features:

  • Comprehensive object introspection.
  • Input history, persistent across sessions.
  • Caching of output results during a session with automatically generated references.
  • Extensible tab completion, with support by default for completion of python variables and keywords, filenames and function keywords.
  • Extensible system of 'magic' commands for controlling the environment and performing many tasks related either to IPython or the operating system.
  • A rich configuration system with easy switching between different setups (simpler than changing $PYTHONSTARTUP environment variables every time).
  • Session logging and reloading.
  • Extensible syntax processing for special purpose situations.
  • Access to the system shell with user-extensible alias system.
  • Easily embeddable in other Python programs and GUIs.
  • Integrated access to the pdb debugger and the Python profiler.

The latest development version is always available from IPython's GitHub site.