Some code snippets showing how one could send logging output to a web page in Python

Logging to a web page

# web_page_logger.py

import logging

class WebPageHandler(logging.Handler):
    def __init__(self):
        logging.Handler.__init__(self)
        self.messages = []

    def emit(self, record):
        self.messages.append(self.format(record))

    def get_messages(self):
        return self.messages

# Create a handler and add it to your loggers:

log_handler = WebPageHandler()
log_handler.setLevel(logging.DEBUG)
formatter = logging.Formatter('%(name)s - %(levelname)s - %(message)s')
log_handler.setFormatter(formatter)

logging.getLogger(__main__).addHandler(log_handler)

# Then, using Flask:

@app.before_request
def set_up_logging():
    global log_handler
    g.log_handler = log_handler

# And then in your Jinja2 template:

{% for message in g.log_handler.get_messages() %}
<p class='log'>{{ message }}</p>
{% endfor %}

# Not super pretty. There are other ways of doing this. But this works and is helpful.