Which code snippet correctly initializes a Langchain prompt template with a placeholder called user?

easy📝 Syntax Q3 of 15

LangChain - Prompt Templates

Which code snippet correctly initializes a Langchain prompt template with a placeholder called user?

Atemplate = PromptTemplate(template="Hello, {user}!") output = template.format(username="Alice")

Btemplate = PromptTemplate(template="Hello, {user}!")

Ctemplate = PromptTemplate(template="Hello, {username}!") output = template.format(user="Alice")

Dtemplate = PromptTemplate(template="Hello, user!")

Step-by-Step Solution

Solution:

Step 1: Understand PromptTemplate initialization
The template string must include the placeholder name inside curly braces exactly as the input variable.
Step 2: Check placeholder and input variable consistency
template = PromptTemplate(template="Hello, {user}!") correctly defines the template with {user} and does not show formatting errors.
Final Answer:
template = PromptTemplate(template="Hello, {user}!") -> Option B
Quick Check:
Placeholder matches variable name [OK]

Quick Trick: Placeholder names must match exactly in template and format [OK]

Common Mistakes:

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