URL parameters with angle brackets in Django - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What is the output of this Django URL pattern match?

Given the URL pattern path('item/<int:id>/', view_function) and a request to /item/42/, what value does the view receive for id?

Django

from django.urls import path

def view_function(request, id):
    return id

urlpatterns = [
    path('item/<int:id>/', view_function),
]

A The view receives the string '42'

B The view receives the integer 42

C The view receives None

D The view raises a ValueError

💡 Hint

Remember that <int:id> converts the URL part to an integer before passing it.

The <int:id> converter in Django URL patterns parses the URL segment as an integer and passes it as an int to the view.

📝 Syntax

intermediate

Which URL pattern syntax is correct to capture a string parameter named 'username'?

Choose the correct Django URL pattern syntax to capture a string parameter called username.

A path('user/<str:username>/', user_view)

B path('user/username/', user_view)

C path('user/<string:username>/', user_view)

D path('user/<text:username>/', user_view)

💡 Hint

Django uses specific converters like str, int, slug.

The correct syntax uses <str:username> to capture a string parameter named username.

🔧 Debug

advanced

Why does this URL pattern cause a 404 error for /product/abc123/?

Given the URL pattern path('product/<int:product_id>/', product_view), why does accessing /product/abc123/ cause a 404 error?

Django

urlpatterns = [
    path('product/<int:product_id>/', product_view),
]

A Because 'abc123' is not an integer, so the pattern does not match

B Because the URL pattern should use <str:product_id> instead

C Because the URL is missing a trailing slash

D Because the view function is missing

💡 Hint

Check what the <int:product_id> converter expects.

The <int:product_id> converter only matches digits. 'abc123' contains letters, so the URL pattern does not match and Django returns 404.

❓ state_output

advanced

What is the value of 'slug' captured by this URL pattern?

Given the URL pattern path('blog/<slug:slug>/', blog_view) and a request to /blog/hello-world-2024/, what is the value of slug passed to the view?

A 'hello/world/2024'

B 'hello world 2024'

C 'hello_world_2024'

D 'hello-world-2024'

💡 Hint

The slug converter matches letters, numbers, underscores, and hyphens.

The slug converter captures the URL part as a string containing letters, numbers, underscores, or hyphens. The value is 'hello-world-2024'.

🧠 Conceptual

expert

What happens when using angle brackets without specifying a converter in Django URL patterns?

Consider the URL pattern path('page/<page_num>/', page_view). What behavior occurs?

A Django raises a ValueError about invalid path converter syntax

B Django raises a TypeError in the view function

C Django treats 'page_num' as a string parameter by default

D Django ignores the angle brackets and matches literally

💡 Hint

Angle brackets without a colon (<param>) default to the str converter.

Django treats <page_num> (without a converter and colon) as using the default str converter for the 'page_num' parameter.