django-quiz.md

Django

Q1. To cache your entire site for an application in Django, you add all except which of these settings?

• django.middleware.common.CommonMiddleware
• django.middleware.cache.UpdateCacheMiddleware
• django.middleware.cache.FetchFromCacheMiddleware
• django.middleware.cache.AcceleratedCacheMiddleware

Reference: Django comes with a robust cache system that lets you save dynamic pages, so they don’t have to be computed for each request. For convenience, Django offers cache with different granularity — from entire website to pages to part of pages to DB query results to any objects in memory. Cache middleware. If enabled, each Django-powered page will be cached based on URL.

Q2. In which programming language is Django written?

• C++
• Java
• Python
• Ruby

Q3. To automatically provide a value for a field, or to do validation that requires access to more than a single field, you should override the ___ method in the ___ class.

• validate(); Model
• group(); Model
• validate(); Form
• clean(); Field

Q4. A client wants their site to be able to load "Rick & Morty" episodes by number or by title—e.g., shows/3/3 or shows/picklerick. Which URL pattern do you recommend?

• A

url(r'shows/<int:season>/<int:episode>/', views.episode_number),
url(r'shows/<slug:episode_name>/', views.episode_name)

• B

path('shows/<int:season>/<int:episode>/', views.episode_number),
path('shows/<slug:episode_name>/', views.episode_name)

• C

path('shows/<int:season>/<int:episode>', views.episode_number),
path('shows/<slug:episode_name>/', views.episode_number)

• D

url(r'^show/(?P<season>[0-9]+)/(?P<episode>[0-9]+)/$', views.episode_number),
url(r'^show/(?P<episode_name>[\w-]+)/', views.episode_name

Q5. How do you determine at startup time if a piece of middleware should be used?

• Raise MiddlewareNotUsed in the init function of your middleware.
• Implement the not_used method in your middleware class.
• List the middleware beneath an entry of django.middleware.IgnoredMiddleware.
• Write code to remove the middleware from the settings in [app]/init.py.

Q6. How do you turn off Django’s automatic HTML escaping for part of a web page?

• Place that section between paragraph tags containing the autoescape=off switch.
• Wrap that section between { percentage mark autoescape off percentage mark} and {percentage mark endautoescape percentage mark} tags.
• Wrap that section between {percentage mark autoescapeoff percentage mark} and {percentage mark endautoescapeoff percentage mark} tags.
• You don't need to do anything—autoescaping is off by default.

Q7. Which step would NOT help you troubleshoot the error "django-admin: command not found"?

• Check that the bin folder inside your Django directory is on your system path.
• Make sure you have activated the virtual environment you have set up containing Django.
• Check that you have installed Django.
• Make sure that you have created a Django project.

Q8. Every time a user is saved, their quiz_score needs to be recalculated. Where might be an ideal place to add this logic?

• template
• model
• database
• view

Q9. What is the correct way to begin a class called "Rainbow" in Python?

• Rainbow {}
• export Rainbow:
• class Rainbow:
• def Rainbow:

Q10. You have inherited a Django project and need to get it running locally. It comes with a requirements.txt file containing all its dependencies. Which command should you use?

• django-admin startproject requirements.txt
• python install -r requirements.txt
• pip install -r requirements.txt
• pip install Django

Q11. Which best practice is NOT relevant to migrations?

• To make sure that your migrations are up to date, you should run updatemigrations before running your tests.
• You should back up your production database before running a migration.
• Your migration code should be under source control.
• If a project has a lot of data, you should test against a staging copy before running the migration on production.

Q12. What will this URL pattern match? url(r'^$', views.hello)

• a string beginning with the letter Ra string beginning with the letter R
• an empty string at the server root
• a string containing ^ and $a string containing ^ and $
• an empty string anywhere in the URLan empty string anywhere in the URL

Q13. What is the typical order of an HTTP request/response cycle in Django?

• URL > view > template
• form > model > view
• template > view > model
• URL > template > view > model

Q14. Django's class-based generic views provide which classes that implement common web development tasks?

• concrete
• thread-safe
• abstract
• dynamic

Q15. Which skills do you need to maintain a set of Django templates?

• template syntax
• HTML and template syntax
• Python, HTML, and template syntax
• Python and template syntax

Q16. How would you define the relationship between a star and a constellation in a Django model?

• A

class Star(models.Model):
name = models.CharField(max_length=100)
class Constellation(models.Model):
stars = models.ManyToManyField(Star)

• B

class Star(models.Model):
constellation = models.ForeignKey(Constellation, on_delete=models.CASCADE)
class Constellation(models.Model):
stars = models.ForeignKey(Star, on_delete=models.CASCADE)

• C

class Star(models.Model):
name = models.CharField(max_length=100)
class Constellation(models.Model):
stars = models.OneToManyField(Star)

• D

class Star(models.Model):
constellation = models.ManyToManyField(Constellation)
class Constellation(models.Model):
name = models.CharField(max_length=100)

Q17. Which is NOT a valid step in configuring your Django 2.x instance to serve up static files such as images or CSS?

• In your urls file, add a pattern that includes the name of your static directory.
• Create a directory named static inside your app directory.
• Create a directory named after the app under the static directory, and place static files inside.
• Use the template tag {percentage mark load static percentage mark}.

Q18. What is the correct way to make a variable available to all of your templates?

• Set a session variable.
• Use a global variable.
• Add a dictionary to the template context.
• Use RequestContext.

Q19. Should you create a custom user model for new projects?

• No. Using a custom user model could break the admin interface and some third-party apps.
• Yes. It is easier to make changes once it goes into production.
• No. Django's built-in models.User class has been tried and tested—no point in reinventing the wheel.
• Yes, as there is no other option.

Q20. You want to create a page that allows editing of two classes connected by a foreign key (e.g., a question and answer that reside in separate tables). What Django feature can you use?

• actions
• admin
• mezcal
• inlines

Q21. Why are QuerySets considered "lazy"?

• The results of a QuerySet are not ordered.
• QuerySets do not create any database activity until they are evaluated.
• QuerySets do not load objects into memory until they are needed.
• Using QuerySets, you cannot execute more complex queries.

Q22. You receive a MultiValueDictKeyError when trying to access a request parameter with the following code: request.GET['search_term']. Which solution will NOT help you in this scenario?

• Switch to using POST instead of GET as the request method.
• Make sure the input field in your form is also named "search_term".
• Use MultiValueDict's GET method instead of hitting the dictionary directly like this: request.GET.get('search_term', '').
• Check if the search_term parameter is present in the request before attempting to access it.

Q23. Which function of Django's Form class will render a form's fields as a series of

tags?

• show_fields()
• as_p()
• as_table()
• fields()

Q24. You have found a bug in Django and you want to submit a patch. Which is the correct procedure?

• Fork the Django repository GitHub.
• Submit a pull request.
• all of these answers.
• Run Django's test suite.

Q25. Django supplies sensible default values for settings. In which Python module can you find these settings?

• django.utils.default_settings.py
• django.utils.global_settings.py
• django.conf.default_settings.py
• django.conf.global_settings.py

Q26. Which variable name is best according to PEP 8 guidelines?

• numFingers
• number-of-Fingers
• number_of_fingers
• finger_num

Q27. A project has accumulated 500 migrations. Which course of action would you pursue?

• Manually merge your migration files to reduce the number
• Don't worry about the number
• Try to minimize the number of migrations
• Use squashmigrations to reduce the number

Q28. What does an F() object allow you when dealing with models?

• perform db operations without fetching a model object
• define db transaction isolation levels
• use aggregate functions more easily
• build reusable QuerySets

Q29. Which is not a Django filed type for holding integers?

• SmallIntegerField
• NegativeIntegerField
• BigAutoField
• PositiveIntegerField

Q30. Which will show the currently installed version?

• print (django.version)
• import django django.getVersion()
• import django django.get_version()
• python -c django --version

Q31. You should use the http method ___ to read data and ___ to update or create data

• READ; WRITE
• GET; POST
• POST; GET
• GET; PATCH

Q32. When should you employ the POST method over GET for submitting data?

• when efficiency is important
• when you want the data to be cached
• when you want to use your browser to help with debugging
• when the data in the form may be sensitive

Q33. When to use the Django sites framework?

• if your single installation powers more than one site
• if you need to serve static as well as dynamic content
• if you want your app have a fully qualified domain name
• if you are expecting more than 10.000 users

Q34. Which infrastructure do you need:

title=models.charfield(max_length=100, validators=[validate_spelling])

• inizialized array called validators
• a validators file containing a function called validate_spelling imported at the top of model
• a validators file containing a function called validate imported at the top of model
• spelling package imported at the top of model

Q35. What decorator is used to require that a view accepts only the get and head methods?

• require_safe()
• require_put()
• require_post()
• require_get()

Q36. How would you define the relation between a book and an author - book has only one author.

class Author (models.model):
book=models.foreignkey(Book,on_delete=models.cascade)
class Book(models.model):
name=models.charfield(max_length=100)

• A

class Author (models.model):
name=models.charfield(max_length=100)
class Book(models.model):
author=models.foreignkey(Author,on_delete=models.cascade)

• B

class Author (models.model):
name=models.charfield(max_length=100)
class Book(models.model):
author=models.foreignkey(Author)

• C

class Author (models.model):
name=models.charfield(max_length=100)
class Book(models.model):
author=models.foreignkey(Author,on_delete=models.cascade)

• D

class Author (models.model):
name=models.charfield(max_length=100)
class Book(models.model):
author=Author.name

Q37. What is a callable that takes a value and raises an error if the value fails?

• validator
• deodorizer
• mediator
• regular expression

Q38. To secure an API endpoint, making it accessible to registered users only, you can replace the rest_framework.permissions.allowAny value in the default_permissions section of your settings.py to

• rest_framework.permissions.IsAdminUser
• rest_framework.permissions.IsAuthenticated
• rest_framework.permissions.IsAuthorized
• rest_framework.permissions.IsRegistered

Q39. Which command would you use to apply a migration?

• makemigration
• update_db
• applymigration
• migrate

Q40. Which type of class allows QuerySets and model instances to be converted to native Python data types for use in APIs?

• objectwriters
• serializers
• picklers
• viewsets

Q41. How should the code end?

{ percentage if spark >= 50 percentage }
Lots of spark
{percentage elif spark == 42 percentage}

• { percentage else percentage}
• {percentage endif percentage}
• Nothing needed
• {percentage end percentage}

Q42. Which code block will create a serializer?

from rest_framework import serializers
from .models import Planet

• A

class PlanetSerializer(serializers.ModelSerializer):
class Meta:
model=Planet
fields=('name','position', 'mass', 'rings')

• B

from rest_framework import serializers
from .models import Planet
class PlanetSerializer():
class Meta:
fields=('name','position', 'mass', 'rings')
model=Planet

• C

from django.db import serializers
from .models import Planet
class PlanetSerializer(serializers.ModelSerializer):
fields=('name','position', 'mass', 'rings')
model=Sandwich

• D

from django.db import serializers
from .models import Planet
class PlanetSerializer(serializers.ModelSerializer):
class Meta:
fields=('name')
model=Planet

Q43. Which class allows you to automatically create a Serializer class with fields and validators that correspond to your model's fields?

• ModelSerializer
• Model
• DataSerializer
• ModelToSerializer

Q44. Which command to access the built-in admin tool for the first time?

• django-admin setup
• django-admin runserver
• python manage.py createuser
• python manage.py createsuperuser

Q45. Virtual environments are for managing dependencies. Which granularity works best?

• you should set up a new virtualenv for each Django project
• They should not be used
• Use the same venv for all your Django work
• Use a new venv for each Django app

Q46. What executes various Django commands such as running a webserver or creating an app?

• migrate.py
• wsgi.py
• manage.py
• runserver

Q47. What do Django best practice suggest should be "fat"?

• models
• controllers
• programmers
• clients

Q48. Which is not part of Django's design philosophy?

• Loose Coupling
• Less Code
• Fast Development
• Implicit over explicit

Q49. What is the result of this template code?

{{"live long and prosper"|truncate:3}}

• live long and ...
• live long and
• a compilation error
• liv

Q50. When does this code load data into memory?

1 sandwiches = Sandwich.objects.filter(is_vegan=True)
2 for sandwich in sandwiches:
3   print(sandwich.name + " - " + sandwich.spice_level)

• line 1
• It depends on how many results return by query.
• It depends on cache.
• line 2

Q51. You are building a web application using a React front end and a Django back end. For what will you need to provision?**

• an NGINX web server
• a NoSQL database
• a larger hard drive
• CORS middleware

Q52. To expose an existing model via an API endpoint, what do you need to implement?**

• an HTTP request
• a JSON object
• a query
• a serializer

Q53. How would you stop Django from performing database table creation or deletion operations via migrations for a particular model?

• Run the migrate command with --exclude=[model_name].
• Move the model definition from models.py into its own file.
• Set managed=False inside the model.
• Don't run the migrate command.

Q54. what method can you use to check if form data has changed when using a form instance?

• has_changed()
• its_changed()
• has_updated()
• None of This

Q55. What is WSGI?

• a server
• an interface specification
• a Python module
• a framework

Q56. Which generic view should be used for displaying the tittles of all Django Reinhardt's songs?

• DetailView
• TittleView
• SongView
• ListView

Q57. Which statement is most accurate, regarding using the default SQLite database on your local/development machine but Postgres in production

• There's less chance of introducing bugs since SQLite already works out the box
• It's fine, you just need to keep both instances synchronized
• It's a bad idea and could lead to issues down the road
• It's the most efficient way to build a project

Q58. Why might you want to write a custom model Manager?

• to perform database queries
• to set up a database for testing
• to modify the initial QuerySet that the Manager returns
• to filter the results that a database query returns

Q59. In Django, what are used to customize the data that is sent to the templates?

• models
• views
• forms
• serializers

Q60. To complete the conditional, what should this block of code end with?

% if sparles >= 50 %
  Lots of sparkles!
% elif sparkles == 42 %
  The answer to life, the universe, and everything!

• % endif %
• Nothing else is needed.
• % end%
• % else %

Q61. When should you employ the POST method over the GET method for submitting data from a form?

• when the data in the form may be sensitive
• when you want the data to be cached
• when you want to use your browser to help with debugging
• when efficiency is important

Q62. What is a callable that takes a value and raises an error if the value fails to meet some criteria?

• mediator
• validator
• regular expression
• deodorizer

Q63. You are uploading a file to Django from a form and you want to save the received file as a field on a model object. You can simply assign the file object from**_to a field of type__**in the model.

• request.META; FileField
• request.FILES; BLOBField
• request.FILES; FileField
• request.META.Files; CLOBField

Q64. What python module might be used to store the current state of a Django model in a file?

• pickle
• struct
• marshal
• serialize

Q65. To add a new app to an existing Django project, you must edit the _ section of the _ file.

• ALLOWED_HOSTS; settings.py
• APPS; manage.py
• INSTALLED_APPS; settings.py
• TEMPLATES; urls.py

Q66. Which is not a third-party package commonly used for authentication?

• django-guardian
• django-rest-auth
• authtoken
• django-rest-framework-jwt

Q67. Which function in the django.urls package can help you avoid hardcoding URLS by generating a URL given the name of a view?

• get_script_prefix()
• redirect()
• reverse()
• resolve()

Q68. Which is Fictional HTTP request method?

• POST
• PUT
• PAUSE
• PATCH

Q69. Which helper function is not provided as a part of django.shortcuts package? ref-

• render_to_request()
• render()
• redirect()
• get_object_or_404()

Reference

Q70. Which is a nonstandard place to store templates?

• at the root level of a project
• inside the application
• in the database
• on Github

Q71. If you left the 8080 off the command python manage.py runserver 8080 what port would Django use as default?

• 8080
• 80
• 8000
• It would fail to start

Q72. Which statement about Django apps is false?

• A Django app is the top-level container for a web application powered by Django.
• Django apps are small libraries designed to represent a single aspect of a project.
• Each Django app should do one thing, and one thing alone.
• A Django project is made up of many apps.

Q73. Which characters are illegal in template variable names?

• underscores.
• uppercase letters.
• punctuation marks .
• numbers.

Reference

Q74. Which is not a valid closing template tag?

• % endautoescape %
• % endifempty %
• % endcomment %
• % endfilter %

Q75. When would you need to use the reverse_lazy utility function instead of reverse?

• when you want to provide a reverse URL as a default value for a parameter in a function's signature
• all of the these answers
• when you want to provide a reverse URL as the url attribute of a class-based generic view
• when you want to provide a URL to a decorator, such as the login_url argument for the permission_required() decorator

Q76. What is the purpose of the init.py file?

• to extend the set of modules found in a package
• to allow compiled modules from different releases and different versions of Python to coexist
• to initialize project settings
• to declare the directory contents as a Python module

Reference

Q77. What python package can be used to edit numbers into more readable form like "1200000" to "1.2 million"?

• black
• puffer
• pitch
• humanize