A Wallet That Says No

10 pts · 10 coins

Python for AIMedium

A Wallet That Says No

Part 1: Wallet(balance)

add(amount) adds money to balance.
spend(amount): if amount is more than the balance, change nothing and return False. Otherwise take it off the balance and return True. Spending exactly what's there is allowed.

Part 2: run_wallet(start, moves)

Make a wallet with start money. moves is a list of pairs like ("add", 10) or ("spend", 4). Apply them in order. Return a list of two numbers: [final balance, how many spends were refused].

Examples

Wallet(3).spend(5)

returns False

start = 10

moves = [('spend', 4), ('spend', 9)]

returns [6, 1]

start = 20

moves = [("spend", 5), ("add", 10), ("spend", 30)]

returns [25, 1]

start = 0

moves = []

returns [0, 0]

Hints

solution.py

1class Wallet:
2    def __init__(self, balance):
3        self.balance = balance
4
5    def add(self, amount):
6        # your code here
7        pass
8
9    def spend(self, amount):
10        # your code here
11        pass
12
13
14def run_wallet(start, moves):
15    # your code here
16    pass
17