When working with Jinja, a popular templating language for Python, it is important to understand which data types are suitable for sending values. Jinja allows us to pass various types of data as variables to templates, each serving a different purpose.
Numeric Data Types
One of the most common data types used in Jinja templates is numeric data. This includes integers, floats, and complex numbers.
Integers
An integer is a whole number without any fractional part. It can be positive or negative. In Jinja, we can pass integer values as variables and perform arithmetic operations on them within the template.
{% raw %}{{ age }}{% endraw %}
Note: The {% raw %}{{ }} syntax is used to display the value of a variable in Jinja templates.
Floats
A float represents a real number with both integer and fractional parts. It is useful when dealing with decimal values or calculations that involve precision. We can pass float values to Jinja templates and perform mathematical operations using them.
{% raw %}{{ price }}{% endraw %}
String Data Types
Jinja also supports string data types for sending textual information to templates. Strings are sequences of characters enclosed in quotes (either single or double). They allow us to display dynamic content or manipulate text within the template.
{% raw %}{{ name }}{% endraw %}
List Data Type
A list is an ordered collection of items that can contain different data types such as integers, floats, strings, or even other lists. In Jinja templates, lists provide a convenient way to loop through multiple values and display them in a structured manner.
{% raw %}{% for item in items %}
- {{ item }}
{% endfor %}{% endraw %}
Note: The {% raw %}{% for %}..{% endfor %} syntax is used to iterate over a list and perform actions for each item within the template.
Dictionary Data Type
A dictionary is an unordered collection of key-value pairs. It allows us to store and retrieve data based on unique keys. In Jinja templates, dictionaries can be used to access specific values based on their keys and display them dynamically.
{% raw %}{{ person.name }}{% endraw %}
Boolean Data Type
The boolean data type represents two possible states: true or false. It is useful for conditional statements in Jinja templates where we want to display or hide content based on certain conditions.
{% raw %}{% if authenticated %}
Welcome, {{ username }}!
{% else %}
Please log in to continue.
{% endif %}{% endraw %}
Note: The {% raw %}{% if %}.{% else %}.{% endif %} syntax is used to conditionally display different content based on the evaluated expression within the template.
In Conclusion
Jinja provides various data types that allow us to pass values from Python code to templates. Understanding these data types enables us to create dynamic and interactive web pages with ease. Whether it’s numeric data, strings, lists, dictionaries, or booleans, Jinja’s flexibility empowers us to build engaging web applications.
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