[Solved] What is the issue with this code snippet?from langchain.prompts import PromptTemplate prompt = PromptTemplate(template="Greetings, {user}!") print(prompt.format(username="Alice")) | LangChain

LangChain - Prompt Templates

What is the issue with this code snippet?

from langchain.prompts import PromptTemplate
prompt = PromptTemplate(template="Greetings, {user}!")
print(prompt.format(username="Alice"))

AThe template string is missing required curly braces

BPromptTemplate cannot be imported from langchain.prompts

CThe variable name in format() does not match the template placeholder

Dformat() method cannot be used with PromptTemplate

Step-by-Step Solution

Solution:

Step 1: Analyze the template
The template expects a variable named user.
Step 2: Analyze the format call
The format method is called with username="Alice", which does not match user.
Step 3: Identify the error
This mismatch causes a KeyError because the template variable is not provided.
Final Answer:
The variable name in format() does not match the template placeholder -> Option C
Quick Check:
Variable names must match exactly in template and format [OK]

Quick Trick: Match variable names exactly in template and format [OK]

Common Mistakes:

Master "Prompt Templates" in LangChain

9 interactive learning modes - each teaches the same concept differently

More LangChain Quizzes

What is the issue with this code snippet?