Logging in production in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the logging module in a Flask app.

Flask

import [1]

Drag options to blanks, or click blank then click option'

Aos

Blogging

Csys

Djson

Attempts:

3 left

💡 Hint

Common Mistakes

Importing unrelated modules like os or sys.

Forgetting to import logging before using it.

To use logging in Flask, you need to import the logging module.

2fill in blank

medium

Complete the code to set the logging level to WARNING in a Flask app.

Flask

app.logger.setLevel(logging.[1])

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AERROR

BDEBUG

CWARNING

DINFO

Attempts:

3 left

💡 Hint

Common Mistakes

Using DEBUG level which logs too much information.

Using INFO level which logs less than DEBUG but more than WARNING.

Setting the logging level to WARNING means only warnings and errors will be logged.

3fill in blank

hard

Fix the error in the code to log an error message in Flask.

Flask

app.logger.[1]("An error occurred")

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Aerror

Blog

Cwarn

Dprint

Attempts:

3 left

💡 Hint

Common Mistakes

Using warn instead of error.

Trying to use print which does not log properly.

The correct method to log an error message is error(). The warn() method is deprecated.

4fill in blank

hard

Fill both blanks to configure a file handler for logging in Flask.

Flask

file_handler = logging.[1]('app.log')
file_handler.setLevel(logging.[2])

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AFileHandler

BStreamHandler

CWARNING

DDEBUG

Attempts:

3 left

💡 Hint

Common Mistakes

Using StreamHandler which logs to console, not file.

Setting level to DEBUG which logs too much.

FileHandler writes logs to a file. Setting level to WARNING logs warnings and above.

5fill in blank

hard

Fill all three blanks to add the file handler to the Flask app logger with a formatter.

Flask

formatter = logging.[1]('%(asctime)s - %(levelname)s - %(message)s')
file_handler.setFormatter([2])
app.logger.[3](file_handler)

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AFormatter

Bformatter

CaddHandler

DremoveHandler

Attempts:

3 left

💡 Hint

Common Mistakes

Using removeHandler instead of addHandler.

Not setting a formatter on the handler.

Confusing the formatter class and instance.

The Formatter formats log messages. We set it on the handler, then add the handler to the app logger with addHandler.