Why Flask contexts matter - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Flask class correctly.

Flask

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

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

Arender_template

BRequest

CBlueprint

DFlask

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request instead of Flask

Using render_template where Flask is needed

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 access the current request object inside a view function.

Flask

from flask import Flask, [1]

app = Flask(__name__)

@app.route('/')
def home():
    user_agent = [1].headers.get('User-Agent')
    return f"Your agent is {user_agent}"

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

Arequest

Bsession

Cg

Durl_for

Attempts:

3 left

💡 Hint

Common Mistakes

Using session instead of request

Trying to access request without importing it

Confusing g with request

The request object gives access to details about the current HTTP request.

3fill in blank

hard

Fix the error in accessing the Flask application context variable.

Flask

from flask import Flask, current_app

app = Flask(__name__)

with app.[1]():
    print('App name:', current_app.name)

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

Arequest

Bapp_context

Ccurrent_app

Dsession

Attempts:

3 left

💡 Hint

Common Mistakes

Using request instead of app_context

Trying to use current_app without context

Not creating any context before accessing app.name

The app_context() method creates the application context needed to access app variables safely.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that stores request header lengths only if the header exists.

Flask

from flask import request

header_lengths = {header: len(request.headers.get(header)) for header in ['User-Agent', 'Host'] if request.headers.get([1]) [2] None}

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

A'User-Agent'

B==

C!=

Dheader

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of '!=' in the condition

Using a header name not in the list

Not checking if header exists before len()

We check if the header exists by comparing it to None with '!=' before getting its length.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that stores uppercase header names and their values if the value length is greater than 5.

Flask

from flask import request

filtered_headers = [1]: [2] for [3], [2] in request.headers.items() if len([2]) > 5

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

Aheader.upper()

Bheader

Cvalue

Drequest.headers

Attempts:

3 left

💡 Hint

Common Mistakes

Using request.headers directly as key or value

Not using .upper() for keys

Mixing variable names in comprehension

The comprehension uses header.upper() as keys, header as the variable for keys, and value as the variable for values.