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What will happen if you try to format a PartialPromptTemplate without providing all remaining variables?

medium📝 Predict Output Q5 of 15
LangChain - Prompt Templates
What will happen if you try to format a PartialPromptTemplate without providing all remaining variables?
base_prompt = PromptTemplate(template="Hello {name}, welcome to {place}!")
partial_prompt = base_prompt.partial(place="office")
partial_prompt.format()
AOutput: "Hello , welcome to office!"
BRaise an error because 'name' is missing
COutput: "Hello {name}, welcome to office!"
DOutput: "Hello name, welcome to office!"
Step-by-Step Solution
Solution:
  1. Step 1: Identify remaining variables after partial

    Partial fills 'place', so 'name' is still required.
  2. Step 2: Formatting without 'name' causes error

    Calling format() without 'name' raises an error because it's missing.
  3. Final Answer:

    Raise an error because 'name' is missing -> Option B
  4. Quick Check:

    Missing variable causes error on format() [OK]
Quick Trick: All variables must be filled before formatting [OK]
Common Mistakes:
  • Assuming missing variables become empty strings
  • Expecting placeholders to remain in output
  • Thinking format auto-fills missing variables

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