Why templates create reusable prompts in LangChain - See It in Action

Why templates create reusable prompts

📖 Scenario: You are building a chatbot that answers questions about movies. You want to create prompts that can be reused with different movie names.

🎯 Goal: Build a simple prompt template that can be reused by changing the movie name.

📋 What You'll Learn

Create a prompt template with a placeholder for the movie name

Create a variable to hold the movie name

Use the prompt template to generate a prompt with the movie name

Print the final prompt text

💡 Why This Matters

🌍 Real World

Chatbots and AI assistants often need to ask similar questions with different details. Templates make this easy and efficient.

💼 Career

Understanding prompt templates is key for AI developers and anyone working with language models to build flexible, reusable prompts.

1

Create a prompt template with a placeholder

Create a variable called template and set it to the string "Tell me about the movie {movie_name}."

LangChain

# Create a prompt template string with {movie_name} placeholder
# Your code here

Need a hint?

Use curly braces {} to mark where the movie name will go.

2

Create a variable for the movie name

Create a variable called movie_name and set it to the string "Inception".

LangChain

template = "Tell me about the movie {movie_name}."
# Create a variable called movie_name with value "Inception"
# Your code here

Need a hint?

Just assign the string "Inception" to the variable movie_name.

3

Generate the prompt using the template and movie name

Create a variable called prompt and set it to the result of template.format(movie_name=movie_name).

LangChain

template = "Tell me about the movie {movie_name}."
movie_name = "Inception"
# Use template.format(movie_name=movie_name) to create prompt
# Your code here

Need a hint?

Use the format method on the template string to replace {movie_name}.

4

Print the final prompt text

Write print(prompt) to display the generated prompt.

LangChain

template = "Tell me about the movie {movie_name}."
movie_name = "Inception"
prompt = template.format(movie_name=movie_name)
# Print the prompt
# Your code here

Need a hint?

Use the print function to show the prompt text.