PythonShellHandler

The PythonShellHandler handler class is a logging.StreamHandler that will output log messages to a Houdini Python Shell pane tab if one is displayed.

This handler works by checking that sys.stdout is pointing to an instance of hou.ShellIO. If that check is true then there is a displayed Python Shell pane tab to output the log message to. If the check fails there is not an active pane tab and the handler will not output a message.

Consider the following example using a log call from a shelf tool where the top half is the system terminal from which Houdini was launched form and the bottom half is a Python Shell parameter pane docked in the desktop.

On the top half we can see three log outputs as the logger is always outputting to a standard stream handler back to the originating shell.

On the bottom we can see that it is missing the second one. This is because the Python Shell tab was open for the first call, hidden for the second call, then displayed again for the first call.