Linkedin Django Q and A

 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 $����������������{�}^{�}��$
•  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 specifications
•  a Python module
•  a framework

Reference link:- https://wsgi.tutorial.codepoint.net/intro

Q56. Which generic view should be used for displaying the titles 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

Q78. Where would you find the settings.py file?

•  [projectname]/settings.py
•  [projectname]/[projectname]/settings.py
•  [PYTHON_ROOT]/settings.py
•  [DJANGO_ROOT]/settings.py

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