Service layer pattern in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a service class method that returns a greeting message.

Flask

class GreetingService:
    def get_greeting(self):
        return [1]

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

Aprint("Hello")

B"Hello from service!"

Creturn "Hi"

DHello

Attempts:

3 left

💡 Hint

Common Mistakes

Using print instead of return

Not using quotes around the string

The method should return a string greeting. Option B correctly returns the string.

2fill in blank

medium

Complete the Flask route to call the service method and return its result.

Flask

from flask import Flask
app = Flask(__name__)

service = GreetingService()

@app.route('/')
def home():
    return [1]

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

Aservice.get_greeting

BGreetingService.get_greeting()

Cservice.get_greeting()

Dget_greeting()

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the method itself without calling it

Calling the method on the class instead of the instance

The route function must call the service method with parentheses to get the greeting string.

3fill in blank

hard

Fix the error in the service method to accept a name parameter and return a personalized greeting.

Flask

class GreetingService:
    def get_greeting(self, [1]):
        return f"Hello, {name}!"

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

Aname

Bself

Cusername

Duser

Attempts:

3 left

💡 Hint

Common Mistakes

Using a parameter name different from the one used in the string

Forgetting to add the parameter

The method must accept a parameter named 'name' to use it in the greeting string.

4fill in blank

hard

Fill both blanks to update the Flask route to accept a name URL parameter and pass it to the service.

Flask

from flask import Flask, request
app = Flask(__name__)

service = GreetingService()

@app.route('/hello/<[1]>')
def hello():
    name = request.view_args.get('[2]')
    return service.get_greeting(name)

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

Aname

Buser

Dusername

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for the URL parameter and the key in view_args

Forgetting to include the URL parameter in the route

The URL parameter and the key to get it from view_args must both be 'name' to match.

5fill in blank

hard

Fill all three blanks to create a service method that validates input and returns a message accordingly.

Flask

class GreetingService:
    def get_greeting(self, name):
        if not name or len(name) [1] 0:
            return [2]
        return f"Hello, {name}[3]"

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

A<=

B"Hello, Guest!"

C!"

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operator

Not returning a default message for empty name

Forgetting punctuation in the greeting

The method checks if name is empty or length is less or equal to zero, returns a default greeting, else returns personalized greeting with exclamation.