[Solved] Given this Pydantic model and parser:from pydantic import BaseModel class User(BaseModel): name: str age: int parser = PydanticOutputParser(pydantic_object=User) text = '{"name": "Alice", "age":... | LangChain

LangChain - Output Parsers

Given this Pydantic model and parser:

from pydantic import BaseModel

class User(BaseModel):
    name: str
    age: int

parser = PydanticOutputParser(pydantic_object=User)

text = '{"name": "Alice", "age": 30}'
result = parser.parse(text)

What will result contain?

AA dictionary with keys 'name' and 'age'

BAn error because parse expects a list

CA string containing the original text

DA User object with name='Alice' and age=30

Step-by-Step Solution

Solution:

Step 1: Understand parser.parse behavior
parser.parse converts the JSON string into a typed Pydantic model instance, here User.
Step 2: Analyze the input text and output
The text is a JSON string with correct keys and types matching User. So parse returns a User object with those values.
Final Answer:
A User object with name='Alice' and age=30 -> Option D
Quick Check:
parse returns typed model instance [OK]

Quick Trick: parse returns model instance, not dict or string [OK]

Common Mistakes:

Expecting a dict instead of model instance
Thinking parse returns raw text
Assuming parse needs a list input

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More LangChain Quizzes

Given this Pydantic model and parser:

Step 1: Understand parser.parse behavior

Step 2: Analyze the input text and output

Final Answer:

Quick Check:

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