Just a quick message on Houdini Expr Editor and its support of PyCharm.
PyCharm has as a “safe write” system, which saves the current file in a temporary file first. This messes up the file watcher of the script, thus, the code is not updated live in the Houdini session.
In order to avoid this, you can go to PyCharm settings => System settings and disable the “safe write” option.