LangChain - LangSmith Observability
Why does this code raise an error?
from langchain import PromptTemplate
prompt_v1 = PromptTemplate(template='Hello {name}')
print(prompt_v1.format())
Why does this code raise an error? from langchain import PromptTemplate prompt_v1 = PromptTemplate(template='Hello {name}') print(prompt_v1.format())
medium📝 Debug Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Understand format method requirements
format() replaces placeholders; missing variables cause errors.Step 2: Identify missing variable in call
format() is called without 'name', so placeholder {name} cannot be replaced.Final Answer:
Missing required variable 'name' in format call -> Option CQuick Check:
format() needs all variables provided [OK]
Quick Trick: Always provide variables when calling format() [OK]
Common Mistakes:
MISTAKES- Calling format() without variables
- Thinking format() is automatic
- Assuming template string is invalid
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