LangChain - Prompt Templates
How can you create a
PromptTemplate that uses a default value for a variable if none is provided during formatting?How can you create a PromptTemplate that uses a default value for a variable if none is provided during formatting?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand PromptTemplate behavior
PromptTemplate does not support default values inside the template string.Step 2: Identify how to handle defaults
You must handle missing variables yourself before calling format(), e.g., by providing a dictionary with defaults.Step 3: Evaluate options
Manually check and replace missing keys before calling format() correctly describes manual handling. Use Python's format syntax with a default: "Hello, {name=Guest}!" is invalid syntax. PromptTemplate automatically fills missing variables with empty strings is false. Use a special argument in PromptTemplate constructor to set defaults does not exist.Final Answer:
Manually check and replace missing keys before calling format() -> Option AQuick Check:
Defaults require manual handling before format() [OK]
Quick Trick: Handle defaults outside PromptTemplate before formatting [OK]
Common Mistakes:
- Expecting default values inside template
- Assuming automatic empty string fill
- Looking for non-existent constructor options
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