InterviewHubPRO
Section Overview
Q22

Question 22 of 65

Part 2: Python Core Language, Internals & Runtime (6 - 25)

34%
Python & FastAPI•Part 2: Python Core Language, Internals & Runtime (6 - 25)

Exception Chaining (`raise ... from ...`):

In Simple Words: Preserves the root cause exception trace when re-raising a higher-level custom domain exception using from e.

python
class DatabaseError(Exception): pass

def query_user(user_id):
    try:
        raise ConnectionRefusedError("Connection failed")
    except ConnectionRefusedError as err:
        # Chains exceptions preserving original traceback:
        raise DatabaseError(f"Could not fetch user {user_id}") from err
Previous Question (21)

Dataclasses vs NamedTuple vs Pydantic:

Next Question (23)

First-Class Functions: