[Solved] Find the bug in this Expense class method:class Expense: def __init__(self, amount, paid_by): self.amount = amount self.paid_by = paid_by def split(self, users): share = self.... | LLD

LLD - Design — Splitwise (Expense Sharing)

Find the bug in this Expense class method:

class Expense:
    def __init__(self, amount, paid_by):
        self.amount = amount
        self.paid_by = paid_by
    def split(self, users):
        share = self.amount / len(users)
        for user in users:
            user.balance -= share

ADivision by zero error possible

Bbalance attribute may not exist in User

CMethod split should return share

DUsing -= instead of +=

Step-by-Step Solution

Solution:

Step 1: Analyze split method logic
It subtracts share from user.balance, assuming balance attribute exists.
Step 2: Identify potential attribute error
If User class lacks balance attribute, this causes runtime error.
Final Answer:
balance attribute may not exist in User -> Option B
Quick Check:
Check User class for balance attribute [OK]

Quick Trick: Ensure User has balance attribute before modifying it [OK]

Common Mistakes:

Ignoring attribute existence
Assuming split must return value
Confusing += and -= operators

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Find the bug in this Expense class method:

Step 1: Analyze split method logic

Step 2: Identify potential attribute error

Final Answer:

Quick Check:

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