Missing 1 required positional argument - 'Self'? - python-3.x

Question

I have the following method of a certain class:
def make_payment(self, cost):
and the following at the main file:
print(money_machine.make_payment(drink.cost))
why is it returning this? (I am following a code-along session and everything seems to be fine with his code)
TypeError: MoneyMachine.make_payment() missing 1 required positional argument: 'cost'
MAIN:
from menu import Menu, MenuItem
from coffee_maker import CoffeeMaker
from money_machine import MoneyMachine
"""1print report
2check resources sufficies
process coins
check transaction successful
make coffee
"""
coffee_maker = CoffeeMaker()
menu = Menu()
money_machine = MoneyMachine
is_on = True
while is_on:
print(menu.get_items())
order = input("your order: ")
if order == 'off':
is_on = False
elif order == "report":
coffee_maker.report()
else:
drink = menu.find_drink(order)
if coffee_maker.is_resource_sufficient(drink):
if money_machine.make_payment(drink.cost):
coffee_maker.make_coffee(drink)
MONEY MACHINE:
class MoneyMachine:
CURRENCY = "$"
COIN_VALUES = {
"quarters": 0.25,
"dimes": 0.10,
"nickles": 0.05,
"pennies": 0.01
}
def __init__(self):
self.profit = 0
self.money_received = 0
def report(self):
"""Prints the current profit"""
print(f"Money: {self.CURRENCY}{self.profit}")
def process_coins(self):
"""Returns the total calculated from coins inserted."""
print("Please insert coins.")
for coin in self.COIN_VALUES:
self.money_received += int(input(f"How many {coin}?: ")) * self.COIN_VALUES[coin]
return self.money_received
def make_payment(self, cost):
"""Returns True when payment is accepted, or False if insufficient."""
print(self.money_received)
self.process_coins()
if self.money_received >= cost:
change = round(self.money_received - cost, 2)
print(f"Here is {self.CURRENCY}{change} in change.")
self.profit += cost
self.money_received = 0
return True
else:
print("Sorry that's not enough money. Money refunded.")
self.money_received = 0
return False

Answer 1

Per your comments, the issue is that you are not instantiating your class correctly.
Overall your instantiation code should be more like this, which is the correct way to instantiate a class:
money_machine = MoneyMachine()
then calling methods would insatiate it correctly and you pass self in, so money_machine.make_payment(drink.cost) would then work as expected.
Instantiating a class is essentially calling the class's __init__() method, this is also where you would define any required arguments if needed when creating a copy of the class. For example:
class MoneyMachine():
def __init__(self, currency_type):
# here you must instantiate with currency_type defined
self.currency_type = currency_type
self.profit = 0
self.money_received = 0
usa_money_machine = MoneyMachine(currency_type='USD')