Advanced Prompt Engineering / Advanced Prompt Structures

Prompt Template

Intermediate [3/5]
Reusable structure Prompt skeleton

Definition

A prompt template is a reusable prompt structure with placeholders for variables. Templates allow you to create consistent, tested prompts that can be dynamically filled with different inputs at runtime.

Templates are essential for production applications where the same type of task needs to be performed repeatedly with different data.

Key Concepts

  • Placeholders: Variables like {input} or {{variable}} that get replaced
  • Static portions: The fixed instruction text that remains constant
  • Variable injection: Safely inserting user or system data
  • Validation: Ensuring all required variables are provided

Examples

Basic Template
Translation Template
Template: "Translate the following {source_lang} text to {target_lang}: {text} Provide only the translation, no explanations." Usage: {source_lang: "English", target_lang: "French", text: "Hello world"}
A reusable template for translation tasks with three variables.
Code Template
Python Implementation
from string import Template prompt_template = Template(""" You are a $role. Analyze the following $content_type: $content Provide your analysis focusing on: $focus_areas """) filled_prompt = prompt_template.substitute( role="senior code reviewer", content_type="Python function", content=user_code, focus_areas="security, performance, readability" )
Templates can be managed as code with proper variable handling.

Interactive Exercise

✎
Design a Template

Create a prompt template for generating product descriptions.

Include placeholders for: product name, key features, target audience.

Pro Tips
  • Use consistent placeholder syntax throughout your project
  • Validate that all placeholders are filled before sending
  • Store templates separately from code for easy updates
  • Consider escaping user input to prevent prompt injection

Related Terms

Prompt Versioning Prompt Patterns Prompt Engineering Prompt Caching