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How to create a Jinja base template

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by gayathrimohan dot icon Updated: Nov 29, 2023

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A Python Jinja base template is a template. This serves as a foundation for other templates in a web app. It is a template engine used in frameworks like Flask and Django.   

 

The base template defines the structure and common elements of a webpage. Those common elements are header, footer, and navigation. By using a base template, you can maintain consistency across your site. This simplifies updating and managing the layout. It lets you define the structure once and reuse it on many pages. In Python, templates help with various purposes. It ranges from simple text formatting to building dynamic web applications.  

 

Here are some types of templates used:  

String Formatting: Basic string interpolation using the % operator or format () method.   

String Templates: The string module provides a Template class for simple string substitution.   

Jinja2 Templates:  

  • Used for web development in frameworks like Flask and Django.  
  • Supports conditional statements, loops, and template inheritance.  

Mako Templates:  

  • A fast and lightweight templating engine.  
  • Suitable for web frameworks like Pyramid.  

Django Templates:  

  • Designed for Django web framework.  
  • Provides a powerful template language with tags and filters.  

HTML Templates:  

  • Used for generating HTML content.  
  • Often combined with web frameworks like Flask or Django.  

XML Templates: Like HTML templates but used for generating XML content.   

ReportLab Templates:  

  • Specialized in generating PDF documents.  
  • Used in combination with the ReportLab library.  

Email Templates:  

  • Used for creating dynamic email content.  
  • It can include placeholders for personalized information.  

JSON Templates: Templates designed for generating dynamic JSON data.   

GUI Templates (e.g., Tkinter): Used in graphical user interfaces for designing layouts.   

Document Templates (e.g., docx, xlsx): Templates for generating documents or spreadsheets.   

Web Application Templates: Framework-specific templates for building complete web applications.  

 

In a Jinja template, you can leverage various features to create dynamic content:  

  • Variables: You can insert variables using double curly braces {{ variable_name }}.   
  • Expressions: It supports expressions within double curly braces. It allows you to perform basic operations and evaluations.   
  • Control Structures: Use {% ... %} for control flow statements like loops (for), conditionals (if, else, elif), and blocks.   
  • Filters: Filters change variables in the template. For instance, {{ name|capitalize }} capitalizes the value of the 'name' variable.   
  • Functions: You can call predefined functions or custom functions within templates.   
  • Template Inheritance: It allows template inheritance. You can create a base template and extend or override specific blocks in child templates.   
  • Macros: Define reusable components with macros, like functions.   
  • Comments: Add comments using {# ... #} to provide information or explanations within the template.  

 

In this, the base template is often named something like "base.html". Find it in a "templates" folder within your project directory.   

Thus, it offers a powerful and efficient way to streamline web development. By separating logic from presentation, they enhance code maintainability and readability. Jinja's template inheritance simplifies the creation of consistent layouts, promoting reusability and scalability.  

Fig: Preview of the output that you will get on running this code from your IDE.

Code

In this solution we are using jinja2 library in Python.

Generate all the variations of template using Jinja2

PythondotLines of Code : 10dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
from jinja2 import Template
t = Template("{{ greeting }}, {{ someone }}")

greetings = ('Hello','Welcome')
someones = ('Jack', 'Alex')

for g in greetings:
   for s in someones:
     print(t.render(greeting=g, someone=s))

Instructions

Follow the steps carefully to get the output easily.


  1. Download and Install the PyCharm Community Edition on your computer.
  2. Open the terminal and install the required libraries with the following commands.
  3. Create a new Python file on your IDE.
  4. Copy the snippet using the 'copy' button and paste it into your python file.
  5. Run the current file to generate the output.


I hope you found this useful.


I found this code snippet by searching for 'How to create a Jinja base template' in Kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. PyCharm Community Edition 2022.3.1
  2. The solution is created in Python 3.11.1 Version
  3. jinja 3.1.2 Version


Using this solution, we can able to create a Jinja base template in python with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to create a Jinja base template in python.

Dependent Library

jinjaby pallets

Python doticonstar image 9285 doticonVersion:3.1.2doticon
License: Permissive (BSD-3-Clause)

A very fast and expressive template engine.

Support
    Quality
      Security
        License
          Reuse

            jinjaby pallets

            Python doticon star image 9285 doticonVersion:3.1.2doticon License: Permissive (BSD-3-Clause)

            A very fast and expressive template engine.
            Support
              Quality
                Security
                  License
                    Reuse

                      You can search for any dependent library on Kandi like 'jinja'.

                      FAQs 

                      1. What is Jinja and how does it work?  

                      Jinja is a template engine for Python. It helps to generate dynamic content in web applications. It allows embedding dynamic data into HTML, XML, or other markup languages. Jinja templates contain placeholders that get replaced with actual values during runtime.  

                       

                      2. How do HTML skeleton documents help with templating in Jinja?                   

                      HTML skeleton documents provide a basic structure for web pages. It serves as a foundation for templating in Jinja. They define the static layout and Jinja. It inserts dynamic content into specific areas of the document using template variables.  

                       

                      3. What are the key features of the Template Designer Documentation?  

                      It helps Jinja to outline key features and syntax for creating templates. It covers expressions, control structures, template inheritance, and filters. Also, it covers other aspects that are crucial for effective template design.  

                       

                      4. How can template variables help to customize a template in Jinja?  

                      Template variables in Jinja are placeholders for dynamic data. They get defined in the template and replaced with actual values when rendering. Variables can hold data such as strings, numbers, or more complex objects. It allows templates to adapt and display different content based on the data.  

                       

                      5. What role does templating play when using a Jinja base template?  

                      Templating in a Jinja base template. It involves creating a base template that defines the structure of a page. It includes common elements like headers and footers. Other templates were then inherited from this base, allowing for modular design. Templating ensures consistency across many pages. It simplifies updates by making changes in one central location—the base template.  

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