Include for reusable fragments in Flask - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of using include in Flask templates?

It allows you to reuse parts of HTML code (fragments) across multiple pages, making your templates cleaner and easier to maintain.

beginner

How do you include a reusable fragment in a Flask template?

Use the Jinja2 syntax: {% include 'filename.html' %} where filename.html is the fragment you want to reuse.

intermediate

Can included fragments in Flask templates access variables from the parent template?

Yes, included fragments share the same context and can use variables passed to the parent template.

beginner

What is a practical example of using include in Flask templates?

You can create a header or footer HTML file and include it in all your pages to keep a consistent look and avoid repeating code.

intermediate

What happens if the included file does not exist in Flask templates?

Flask will raise a template error when rendering, indicating the included file was not found.

Which Jinja2 syntax is used to include a reusable fragment in a Flask template?

A {{ include('fragment.html') }}

B {% include 'fragment.html' %}

C <include src='fragment.html' />

D {% import 'fragment.html' %}

The correct syntax to include a fragment is {% include 'fragment.html' %}.

What is a main benefit of using include for reusable fragments in Flask templates?

A Speed up server response time

B Encrypt template files

C Automatically cache templates

D Avoid repeating code and keep templates clean

Including reusable fragments helps avoid repeating code and keeps templates organized.

Can included fragments access variables defined in the parent template?

A Only if variables are passed explicitly

B No, they have separate contexts

C Yes, they share the same context

D Only if using global variables

Included fragments share the same context and can use variables from the parent template.

What happens if you include a non-existing file in a Flask template?

A Flask raises a template error

B Flask ignores the include silently

C Flask creates an empty file automatically

D Flask logs a warning but renders normally

Flask will raise an error indicating the included file was not found.

Which of these is a good use case for include in Flask templates?

A Reusing a navigation bar across pages

B Storing user data securely

C Running Python code inside templates

D Styling templates with CSS

Including a navigation bar fragment helps reuse it on many pages easily.

Explain how and why you would use include in Flask templates to reuse HTML fragments.

Think about how websites have the same header on many pages.

Describe what happens if you try to include a file that does not exist in a Flask template.

Consider what happens if you try to open a missing file on your computer.