Jinja Arithmetic Expression *
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* operator in Jinja2 is an arithmetic operator that multiplies two numbers. Additionally, it can be used to repeat a string or a list multiple times. Its behavior is consistent with the * operator in Python.nn
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How It Works
nThe * operator’s behavior depends on the data types of the objects it’s being applied to:n
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- Numbers: It performs standard mathematical multiplication.
- Strings: When a string is multiplied by an integer, it returns a new string that is the original string repeated the specified number of times.
- Lists: When a list is multiplied by an integer, it returns a new list that is the original list repeated the specified number of times.
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Syntax
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{{ number1 * number2 }}n{{ string * integer }}n{{ list * integer }}nn
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Demonstration with Code Samples
nHere are some practical examples of how to use the * operator in a Jinja2 application.n
1. Multiplying Numerical Values
nThis is the most common use case, often used to calculate a total based on quantity and price.nnJinja2 Templaten
{% set item_price = 15 %}n{% set quantity = 3 %}n<p>Total cost: ${{ item_price * quantity }}</p>nExplanation: The template multiplies the numerical values of `item_price` and `quantity`, resulting in the output “Total cost: $45”.nn
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2. Repeating a String
nThis is useful for creating visual separators or patterns in your templates.nnJinja2 Templaten
<p>Header</p>n<p>{{ '-' * 20 }}</p>n<p>Content</p>nExplanation: The template repeats the `-` character 20 times, creating a horizontal line to separate the header and content. The output will be a paragraph containing “——————–“.nn
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3. Repeating a List
nThe `*` operator can be used to quickly create a list with a repeated pattern of elements.nnJinja2 Templaten
{% set items = ['Item A', 'Item B'] %}n{% set repeated_items = items * 2 %}n<p>Repeated List: {{ repeated_items }}</p>nExplanation: The template repeats the `items` list twice, creating a new list. The output will be `[‘Item A’, ‘Item B’, ‘Item A’, ‘Item B’]`.nn