No Handlers Could Be Found for Logger

Why This Happens

Python's logging module requires at least one handler. Without configuration, log messages are silently dropped.

The Problem

import logging
logger = logging.getLogger('myapp')
logger.info('Starting...')  # No output

The Fix

import logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger('myapp')
logger.info('Starting...')

Step-by-Step Fix

1. 1

   Call basicConfig()

   Call logging.basicConfig(level=logging.INFO) at startup.

2. 2

   Add handlers

   Add StreamHandler for console or FileHandler for files.

3. 3

   Set log level

   Use logger.setLevel() to control message visibility.