Glad it works! 
Not sure if it’s required but I added
You’re right. Clearing the log handlers is probably a good idea to avoid duplicates due to script reruns.
PS How is the logging module writing to the console without using stdout (or stderr)? I’d always assumed that was the only mechanism to write to the console?
It’s writing to stderr. The StreamHandler in Python’s logging module sends logs to streams like stderr or stdout or even to files, if configured to do so. When you create a logger and don’t specifically configure its handlers, it uses stderr. This is why you see log messages in the console, even though you’re not explicitly writing to stdout. Here’s where that happens in Streamlit’s logging module:
By default, the StreamHandler in Python logging writes to stderr and not stdout.
This means that even though the log messages are displayed in the console, they are being sent via stderr.
In Streamlit’s case, each logger is configured with this StreamHandler and a specific format, directing its output to stderr. This is why your initial approach with redirecting stdout did not capture these log messages, as they were not being routed through stdout. Additionally, Streamlit loggers do not propagate their log messages to the root logger (logger.propagate = False). This means that any configuration done on the root logger (like redirecting stdout) does not affect Streamlit’s loggers.