Logging configuration in FastAPI - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the logging module in FastAPI.

FastAPI

import [1]

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

Asys

Bos

Cuvicorn

Dlogging

Attempts:

3 left

💡 Hint

Common Mistakes

Importing unrelated modules like os or sys.

Trying to import uvicorn instead of logging.

The logging module is used to configure and use logging in FastAPI applications.

2fill in blank

medium

Complete the code to create a logger instance named 'app_logger'.

FastAPI

app_logger = logging.[1]('app_logger')

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

AbasicConfig

BgetLogger

CLogger

DsetLevel

Attempts:

3 left

💡 Hint

Common Mistakes

Using Logger class directly without instantiation.

Using basicConfig which is for configuration, not logger creation.

The getLogger function creates or retrieves a logger instance by name.

3fill in blank

hard

Fix the error in setting the logging level to INFO.

FastAPI

app_logger.setLevel(logging.[1])

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

Ainfo

BWarning

CINFO

Ddebug

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'info' which causes attribute error.

Using wrong case like 'Warning' instead of 'WARNING'.

Logging levels are constants in uppercase, so INFO must be uppercase.

4fill in blank

hard

Fill both blanks to configure logging format and level using basicConfig.

FastAPI

logging.basicConfig(format=[1], level=logging.[2])

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

A'%(asctime)s - %(levelname)s - %(message)s'

BDEBUG

CINFO

D'%(message)s - %(levelname)s'

Attempts:

3 left

💡 Hint

Common Mistakes

Using DEBUG level when INFO is required.

Using incomplete or incorrect format strings.

The format string defines the log message layout, and level sets the minimum severity to INFO.

5fill in blank

hard

Fill all three blanks to create a logger, set level to WARNING, and log a warning message.

FastAPI

logger = logging.[1]('my_logger')
logger.setLevel(logging.[2])
logger.[3]('This is a warning!')

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

AgetLogger

BWARNING

Cwarning

Dinfo

Attempts:

3 left

💡 Hint

Common Mistakes

Using info() method instead of warning().

Setting level to lowercase or wrong level.

Use getLogger to create the logger, set level to WARNING, and call warning() to log a warning message.

Practice

1. What is the main purpose of configuring logging in a FastAPI application?

easy

A. To track app activity and errors for easier debugging

B. To speed up the app's response time

C. To automatically update the app's dependencies

D. To create user interface themes

Solution

1. Step 1: Understand logging purpose

   Logging records events and errors during app execution.

2. Step 2: Connect to debugging

   Tracking these events helps developers find and fix issues.

3. Final Answer:

   To track app activity and errors for easier debugging -> Option A

4. Quick Check:

   Logging = Track activity/errors [OK]

Hint: Logging is for tracking events and errors [OK]

Common Mistakes:

• Confusing logging with performance optimization
• Thinking logging updates app code automatically
• Mixing logging with UI design

2. Which of the following is the correct way to set up basic logging in a FastAPI app using Python's logging module?

easy

A. log.config(level=logging.DEBUG)

B. logging.setup(level='DEBUG')

C. logging.basicConfig(level=logging.DEBUG)

D. logging.start(level=logging.DEBUG)

Solution

1. Step 1: Recall Python logging setup

   The standard method is logging.basicConfig() to configure logging.

2. Step 2: Check syntax correctness

   logging.basicConfig(level=logging.DEBUG) correctly sets the log level.

3. Final Answer:

   logging.basicConfig(level=logging.DEBUG) -> Option C

4. Quick Check:

   Use basicConfig for logging setup [OK]

Hint: Use logging.basicConfig() to configure logging [OK]

Common Mistakes:

• Using non-existent logging.setup() method
• Misspelling logging as log
• Using start() instead of basicConfig()

3. Given this FastAPI logging setup code:

import logging
logging.basicConfig(level=logging.WARNING)
logging.debug('Debug message')
logging.warning('Warning message')

What will be printed to the console?

medium

A. Warning message

B. Debug message

C. Debug message\nWarning message

D. No output

Solution

1. Step 1: Understand logging levels

   Level WARNING means only WARNING and above are shown, DEBUG is lower level.

2. Step 2: Check which messages print

   DEBUG message is ignored, WARNING message is printed.

3. Final Answer:

   Warning message -> Option A

4. Quick Check:

   Level WARNING shows warnings only [OK]

Hint: Only messages at or above set level print [OK]

Common Mistakes:

• Expecting DEBUG messages to print at WARNING level
• Thinking all messages print regardless of level
• Confusing logging levels order

4. You wrote this code to configure logging:

import logging
logging.basicConfig(level='DEBUG')
logging.info('Info message')

But no output appears. What is the likely problem?

medium

A. You need to import sys module first

B. The level argument should be logging.DEBUG, not a string

C. basicConfig() must be called after logging.info()

D. logging.info() does not print messages

Solution

1. Step 1: Check logging level argument type

   logging.basicConfig expects level as a constant like logging.DEBUG, not a string.

2. Step 2: Understand effect of wrong level

   Passing 'DEBUG' string is ignored, default level WARNING applies, so info messages don't show.

3. Final Answer:

   The level argument should be logging.DEBUG, not a string -> Option B

4. Quick Check:

   Level must be logging.DEBUG constant [OK]

Hint: Use logging.DEBUG constant, not string 'DEBUG' [OK]

Common Mistakes:

• Passing level as string instead of constant
• Calling basicConfig after logging calls
• Assuming info messages never print

5. You want to log messages to a file named app.log with level INFO and include timestamps. Which is the correct logging configuration code?

hard

A. logging.basicConfig(file='app.log', level='INFO', format='%(time)s - %(msg)s')

B. logging.basicConfig(filename='app.log', level=logging.DEBUG, format='%(message)s')

C. logging.setup(filename='app.log', level=logging.INFO, format='%(asctime)s - %(message)s')

D. logging.basicConfig(filename='app.log', level=logging.INFO, format='%(asctime)s - %(message)s')

Solution

1. Step 1: Check correct parameter names

   logging.basicConfig uses filename, level, and format parameters correctly.

2. Step 2: Verify format string and level

   Format '%(asctime)s - %(message)s' adds timestamp; level INFO matches requirement.

3. Final Answer:

   logging.basicConfig(filename='app.log', level=logging.INFO, format='%(asctime)s - %(message)s') -> Option D

4. Quick Check:

   Use filename, level=logging.INFO, correct format [OK]

Hint: Use filename and format with %(asctime)s for timestamps [OK]

Common Mistakes:

• Using wrong parameter names like file instead of filename
• Passing level as string instead of constant
• Incorrect format placeholders