[Solved] Why does this routing code cause a runtime error?conditions = [lambda ctx: ctx['value'] > 0, lambda ctx: ctx['value'] ctx = {} | LangChain

LangChain - LangGraph for Stateful Agents

Why does this routing code cause a runtime error?

conditions = [lambda ctx: ctx['value'] > 0, lambda ctx: ctx['value'] <= 0]
ctx = {}

Actx should be a list, not a dictionary

BLambda functions are not defined properly

CConditions overlap causing infinite loop

Dctx dictionary lacks 'value' key causing KeyError

Step-by-Step Solution

Solution:

Step 1: Identify cause of runtime error
ctx is empty dictionary, so ctx['value'] access raises KeyError.
Step 2: Verify other options
Lambdas are correct, no infinite loop, and ctx type is correct as dict.
Final Answer:
ctx dictionary lacks 'value' key causing KeyError -> Option D
Quick Check:
Missing key in ctx causes KeyError [OK]

Quick Trick: Ensure context keys exist before access [OK]

Common Mistakes:

MISTAKES

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Why does this routing code cause a runtime error?