[Solved] What will happen if you run this code?from langchain.chains import SequentialChain chain = SequentialChain(chains=[], input_variables=["text"]) output = chain.run({"text": "Test"}) | LangChain

LangChain - Chains and LCEL

What will happen if you run this code?

from langchain.chains import SequentialChain
chain = SequentialChain(chains=[], input_variables=["text"])
output = chain.run({"text": "Test"})

AIt raises an error because chains list is empty

BIt returns the input dictionary unchanged

CIt returns an empty string

DIt returns None

Step-by-Step Solution

Solution:

Step 1: Check SequentialChain requirements
SequentialChain expects a non-empty list of chains to process input.
Step 2: Analyze empty chains list effect
Providing an empty list causes the chain to have no steps, which raises an error on run.
Final Answer:
It raises an error because chains list is empty -> Option A
Quick Check:
Empty chains list causes error [OK]

Quick Trick: SequentialChain needs at least one chain to run [OK]

Common Mistakes:

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