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Which of the following is the correct way to inject a variable user_name into a Langchain prompt template?

easy📝 Syntax Q12 of 15
LangChain - RAG Chain Construction
Which of the following is the correct way to inject a variable user_name into a Langchain prompt template?
Aprompt_template.inject(user_name)
Bprompt_template.append(user_name)
Cprompt_template.fill(user_name)
Dprompt_template.format(user_name=user_name)
Step-by-Step Solution
Solution:

  1. Step 1: Recall Langchain prompt syntax

    Langchain uses the format() method to fill placeholders in prompt templates.

  2. Step 2: Match method to injection

    Only format(user_name=user_name) correctly injects the variable into the placeholder.

  3. Final Answer:

    prompt_template.format(user_name=user_name) -> Option D

  4. Quick Check:

    Use format() to inject variables [OK]
Quick Trick: Use .format() to fill placeholders in templates [OK]
Common Mistakes:
  • Using non-existent methods like inject() or fill()
  • Trying to append variables instead of formatting
  • Forgetting to name the variable in format()

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