Which of the following Python code snippets correctly handles a parsing failure in Langchain by catching the appropriate exception?

easy📝 Syntax Q3 of 15

LangChain - Output Parsers

Atry: output = parser.parse(data) except Exception: output = 'Failed'

Btry: output = parser.parse(data) except ParseError: output = None

Ctry: output = parser.parse(data) except: print('Error')

Dtry: output = parser.parse(data) except ValueError: output = 'Error'

Step-by-Step Solution

Solution:

Step 1: Identify the correct exception
Langchain parsing failures raise ParseError, so catching this specific exception is necessary.
Step 2: Check the syntax
try: output = parser.parse(data) except ParseError: output = None uses except ParseError: which correctly catches the parsing failure.
Step 3: Verify other options
try: output = parser.parse(data) except Exception: output = 'Failed' catches a generic Exception, which is broader but less precise. try: output = parser.parse(data) except: print('Error') uses a bare except which is discouraged. try: output = parser.parse(data) except ValueError: output = 'Error' catches ValueError, which is unrelated.
Final Answer:
try: output = parser.parse(data) except ParseError: output = None correctly handles parsing failures.
Quick Check:
Catch specific exceptions for parsing errors [OK]

Quick Trick: Always catch ParseError for Langchain parsing failures [OK]

Common Mistakes:

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