question 173 Exceptions & Validation · easy

Payments that can't be booked

Runtime Market's payment export has an amount column typed as text. Before booking, finance wants every payment that can't be booked, with the reason.

Functioninvalid_amounts(payments)

paymentsdictionaries with payment_id and a text amount

Returns{payment_id: reason} for each bad payment, in order: "not a number" when float can't read the amount, "not positive" when it is 0 or less

Rulesgood payments don't appear; refunds are a separate export, so a negative amount here is a mistake

Examples

callinvalid_amounts([{'payment_id': 'PAY0000045', 'amount': '12.93'}, {'payment_id': 'PAY0000416', 'amount': 'ninety'}, {'payment_id': 'PAY0001357', 'amount': '-71.14'}, {'payment_id': 'PAY0001503', 'amount': '1,234.00'}])returns{'PAY0000416': 'not a number', 'PAY0001357': 'not positive', 'PAY0001503': 'not a number'}

callinvalid_amounts([{'payment_id': 'P1', 'amount': '5'}])returns{}

callinvalid_amounts([{'payment_id': 'P2', 'amount': ''}])returns{'P2': 'not a number'}