logging.getLogger

Learn to get a logger with logging.getLogger.

logging.getLogger

logging.getLogger(name) returns a logger object. Calls with the same name always return the same object; this lets you categorize logs.

import logging

logger = logging.getLogger("myapp")
print(logger.name)  # myapp

Logger names are usually hierarchical with dots: myapp.db, myapp.api. This lets child loggers inherit from the parent.

Logger hierarchy

Logger names are dot-separated; myapp.db is a child of myapp. The child inherits the level and handler settings of the parent.

parent = logging.getLogger("myapp")
child = logging.getLogger("myapp.db")
print(child.parent.name)  # myapp

The root logger is obtained with getLogger() (no name); all loggers are attached to it. This hierarchy makes it easy to organize logs in large applications.

Exercise Get a logger and print its name

Start with import logging. Get a logger with logger = logging.getLogger("myapp"). Print its name with print(logger.name).

Show example solution

import logging

logger = logging.getLogger("myapp")
print(logger.name)

Test yourself

What happens if logging.getLogger("myapp") is called twice?
- Different objects are returned
- The same object is returned
- An error is raised
- None is returned
Show answer

The same object is returned — Calls with the same name return the same logger.

Complete the getLogger call

import logging

logger = logging.____("myapp")

Show answer

import logging

logger = logging.getLogger("myapp")

Match the getLogger concepts

getLogger

Gives a logger
logger.name

Returns the name
myapp.db

Is a child logger
getLogger()

Is the root logger

Next lesson: Log levels

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