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Identify the bug in this hold expiration check code:

medium📝 Analysis Q6 of 15
LLD - Design — Library Management System
Identify the bug in this hold expiration check code:
def is_hold_valid(hold):
    if hold.expiry_time > current_time:
        return True
    else:
        return False
AThe comparison operator should be '<' instead of '>'
BThe function should return False when expiry_time is greater than current_time
CNo bug, code is correct
Dcurrent_time variable is undefined
Step-by-Step Solution
Solution:
  1. Step 1: Check variable usage

    current_time is used but not defined or passed in the function.
  2. Step 2: Confirm logic correctness

    Comparison logic is correct: hold is valid if expiry_time is in future.
  3. Final Answer:

    current_time variable is undefined -> Option D
  4. Quick Check:

    Undefined variable causes bug [OK]
Quick Trick: Always define or pass current time in expiry checks [OK]
Common Mistakes:
MISTAKES
  • Confusing comparison direction
  • Ignoring undefined variables
  • Assuming code is correct without checking context

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