If you want to print your log messages, you can make use of server['logger'] within handlers or middlewares. It is a Python’s Logger object.
You are responsible for sanitizing input to the logger.
from tremolo import Tremolo
app = Tremolo()
@app.route('/hello')
async def hello_world(**server):
logger = server['logger']
logger.info('Current page: /hello')
return 'Hello world!', 'latin-1'
if __name__ == '__main__':
app.run('0.0.0.0', 8000, debug=True)