Error handling in chains in LangChain - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the correct error class from LangChain.

LangChain

from langchain.chains import SimpleChain
from langchain.errors import [1]

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AChainError

BChainFault

CChainFailure

DChainException

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent error class like ChainException.

The correct error class to handle chain errors in LangChain is ChainError.

2fill in blank

medium

Complete the code to catch errors when running a chain.

LangChain

try:
    result = chain.run(input_data)
except [1] as e:
    print(f"Error: {e}")

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ARuntimeError

BException

CChainError

DValueError

Attempts:

3 left

💡 Hint

Common Mistakes

Catching general Exception instead of ChainError.

To specifically catch errors from LangChain chains, use ChainError.

3fill in blank

hard

Fix the error in the code to retry the chain on failure.

LangChain

from langchain.chains import RetryChain
retry_chain = RetryChain(chain=chain, retries=[1])
result = retry_chain.run(input_data)

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A'3'

BTrue

CNone

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Passing retries as a string instead of an integer.

The retries parameter expects an integer, not a string.

4fill in blank

hard

Fill both blanks to handle errors and log them before retrying.

LangChain

try:
    result = chain.run(input_data)
except [1] as error:
    [2](f"Chain failed with error: {error}")

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AChainError

Bprint

Clogging.error

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Catching general Exception instead of ChainError.

Using print instead of logging.error.

Catch ChainError and use logging.error to log the error message.

5fill in blank

hard

Fill all three blanks to create a chain with error handling and a fallback chain.

LangChain

from langchain.chains import [1], FallbackChain
primary_chain = [2](llm=llm)
fallback_chain = FallbackChain(chains=[primary_chain, backup_chain])
try:
    output = fallback_chain.run(input_text)
except [3] as e:
    print(f"Fallback failed: {e}")

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ASimpleChain

BChainError

CLLMChain

DRetryChain

Attempts:

3 left

💡 Hint

Common Mistakes

Using SimpleChain instead of LLMChain.

Catching Exception instead of ChainError.

Use LLMChain to create the primary chain and catch ChainError for errors.