[Solved] What is the main issue with this code snippet for streaming in LangChain?llm = OpenAI(streaming=True, callbacks=PrintTokens()) llm('Test') | LangChain

LangChain - Production Deployment

What is the main issue with this code snippet for streaming in LangChain?

llm = OpenAI(streaming=True, callbacks=PrintTokens())
llm('Test')

AThe PrintTokens class is missing required methods.

Bstreaming=True is not a valid parameter for OpenAI.

CCallbacks must be passed as a list, not a single instance.

DThe llm call should be awaited with async syntax.

Step-by-Step Solution

Solution:

Step 1: Check callback parameter type
LangChain expects callbacks as a list, even if only one handler is used.
Step 2: Identify error cause
Passing callbacks=PrintTokens() (not in a list) causes a type error or unexpected behavior.
Final Answer:
Callbacks must be passed as a list, not a single instance. -> Option C
Quick Check:
Callbacks = list of handlers [OK]

Quick Trick: Always wrap callbacks in a list, even if one [OK]

Common Mistakes:

MISTAKES

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