Profiling Flask applications - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Flask class from the flask package.

Flask

from flask import [1]
app = [1](__name__)

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

AFlask

BRequest

Crender_template

DBlueprint

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request instead of Flask

Using render_template instead of Flask

Forgetting to import Flask

The Flask class is imported from the flask package to create the app instance.

2fill in blank

medium

Complete the code to add the Flask-Profiler extension to the app.

Flask

from flask_profiler import Profiler

app = Flask(__name__)
app.config["flask_profiler"] = {"enabled": True}
profiler = [1](app)

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

AProfilerApp

BProfilerMiddleware

CProfilerExtension

DProfiler

Attempts:

3 left

💡 Hint

Common Mistakes

Using ProfilerMiddleware which is not part of flask_profiler

Using ProfilerExtension which does not exist

Not passing the app instance

The Profiler class from flask_profiler is used to enable profiling on the Flask app.

3fill in blank

hard

Fix the error in the route decorator to profile the home page.

Flask

@app.route([1])
def home():
    return "Hello, Flask Profiler!"

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

Aapp

B"/"

Chome

D"/home"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a function name instead of a string path

Using an incorrect path like "home" without slash

Passing the app object instead of a string

The route decorator needs a string path. The home page is at "/".

4fill in blank

hard

Fill both blanks to configure Flask-Profiler to store data in a SQLite database.

Flask

app.config["flask_profiler"] = {
    "enabled": True,
    "storage": [1],
    "storage_path": [2]
}

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

A"sqlite"

B"memory"

C"/tmp/flask_profiler.sqlite"

D"/var/log/flask_profiler"

Attempts:

3 left

💡 Hint

Common Mistakes

Using "memory" storage which does not persist data

Providing a directory path instead of a file path

Not enabling profiling

To store profiling data in SQLite, set storage to "sqlite" and provide a file path for storage_path.

5fill in blank

hard

Fill all three blanks to create a custom middleware that logs request time in Flask.

Flask

import time
from flask import request

@app.before_request
def start_timer():
    [1] = time.time()
    setattr([2], "start_time", [1])

@app.after_request
def log_request(response):
    duration = time.time() - getattr([3], "start_time", time.time())
    print(f"Request took {duration:.4f} seconds")
    return response

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

Astart_time

Brequest

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Not using the request object to store start time

Using inconsistent variable names

Not returning the response in after_request

The middleware saves the start time in the request object and calculates duration after the request.