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20 Answered Test Questions:
1. Consider the following Python string representing a human readable date and time:
dt="Jan 14 2009 11:00PM"
Which of the following code snippets will convert the above string to a Python Datetime object that is suitable for a django.models.DateField?
Answers:
� date_object = time.strptime(dt, ‘%b %d %Y %I:%M%p’)
� date_object = datetime.strptime(dt, ‘%b %d %Y %I:%M%p’)
� date_object = datetime.strptime(dt, ‘%B %D %Y %I:%M%p’)
� date_object = time.strptime(dt, ‘%b %d %Y %I:%M%p’)
2. Which of the following is false about the django.models.SlugField() model field?
Answers:
� It is used when performing a query, or as a part of a URL, since by default it ensures uniqueness.
� To create a slug based on another field automatically in the admin, prepopulated_fields has to be used.
� It can only contain letters, numbers, underscores or hyphens.
� Slugs can created in Django templates using the builtin filter, “django.template.defaultfilters.slugify”, formatted as slugify .
3. What does the django.core.context_processors.static() method do?
Answers:
� It takes a path and urljoins it with the static prefix STATIC_URL.
� It adds STATIC_URL to every template context rendered with RequestContext contexts.
� It populates a template variable with the static prefix STATIC_URL to be used as a variable or directly.
� None of these.
4. Which of the following statements is true about the django.template.RequestContext class?
Answers:
� It takes a Context object as its first argument.
� It takes an HttpRequest as its first argument.
� It does not automatically the context with variables.
� It can only be given one context processor.
5. Consider two Django QuerySets query_set_1 and query_set_2 from two different models.
Which of the following code snippets is the most performant when concatenating the two QuerySets into one list?
Answers:
� from itertools import chain result_list = list(chain(query_set_1,query_set_2))
� result_list = query_set_1 | query_set_2
� from django.db.models import Q result_list = Q(query_set_1) | Q(query_set_1)
� from itertools import chain result_list = chain(query_set_1, query_set_2)
6. Which of the following statements about database transactions in Django is false?
Answers:
� “atomic” blocks allows the creation of blocks of code within which the atomicity on the database is guaranteed.
� “atomic” blocks cannot be nested.
� “atomic” can be used as a decorator.
� “atomic” can be used as a context manager.
7. Consider the following code snippet for a Django Model:
class Salary(models.Model):
amount = models.PositiveIntergerField(help_text="eg 8000")
retired = models.BooleanField(help_text="True if above average")
�........
Which of the following will correctly produce a QuerySet of all Salary objects where retired == True and amount != 7300?
Answers:
� results = Salary.objects.exclude(retired=true, amount__lt=7300).exclude(retired=true,amount__gt=7300)
� from django.db.models import Q results = Salary.filter(~Q(amount=7300),retired=True)
� results = Salary.objects.filtered(retired=True, amount__ne=7300)
� from django.db.models import Q results = Salary.filter(Q(amount=7300),retired=True)
8. Which of the following gets called when a view raises an exception?
Answers:
� view_exception()
� process_exception()
� execution_exception()
� controller_exception()
9. What is the best way to extend the Django user model with extra custom fields in addition to the fields already provided?
Answers:
� Use a a proxy model based on django.contrib.auth.models.User.
� Subclass django.contrib.auth.models.AbstractUser and add the extra fields.
� Subclass django.contrib.auth.models.AbstractBaseUser and add the extra fields.
� Use a one-to-one relationship to a model containing the extra fields.
10. Which of the following statements are true about the ImageField class?
Answers:
� It inherits all attributes and methods from the FileField class.
� It validates that the uploaded object is a valid image.
� Its instances are created as varchar(200) columns in the database.
� It’s default form widget is a ClearableFileInput.
11. What does the "with" template tag do?
Answers:
� It adds its argument to the value.
� It caches a complex under a simpler name.
� It filters the contents of the blog through one or more filters.
� None of these.
12. Which of the following statement is false about the django.http.HttpRequest.get_host() method ?
Answers:
� If DEBUG = False and ALLOWED_HOSTS= [] the method will raise SuspiciousOperation exception resulting in an HTTP Error 500 Internal server error.
� The method will fail when the host is behind multiple proxies, in this case one solution is to use middleware which will rewrite the proxy headers.
� This method is invoked if some code accesses the Host header from request.META, thus providing a security measure to prevent an attacker from poisoning caches and password reset emails with links to malicious hosts by submitting requests with a fake HTTP Host header.
� The method uses information from the HTTP_X_FORWARDED_HOST and HTTP_HOST headers, in that order, or a combination of SERVER_NAME and SERVER_PORT if the latter does not provide a value.
13. What is the default max_length value of a SlugField class in Django?
Answers:
� 50
� 100
� 25
� 150
14. Which of the following is a built-in BaseCommand subclass?
Answers:
� AppCommand
� HelperCommand
� HandlerCommand
� DBCommand
15. Which of the following statements is true about Django's default implementation of the authentication system?
Answers:
� Django stores passwords in plain text on the user model.
� It returns a UserAccount object is the password for a given username is authenticated.
� Permissions can only be set on a per type of object basis.
� django.contrib.auth will ensure that add, change and delete permissions are created for each Django model defined in an installed application.
16. Which of the following happens when process_exception() returns "None"?
Answers:
� The template response will be applied.
� The response middleware will be applied.
� The default exception handling will be applied.
� None of these.
17. Which of the following is not a predefined log level in Django?
Answers:
� DEBUG
� INFO
� WARNING
� FATAL
18. Which of the following classes uses an HTTP 304 status code?
Answers:
� HttpResponseNotModified
� HttpResponseRedirect
� HttpResponseForbidden
� HttpResponseServerError
19. Which of the following django.template.loader functions will take a list of template names and return the first template that exists?
Answers:
� find_one_template
� find_template
� get_template
� select_template
20. Which of the following is not a built-in Django template loader class?
Answers:
� file.Loader
� cached.Loader
� eggs.Loader
� app_directories.Loader
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