[Python] Learn Python, exercise 6.7

I'm reading Lutz & Ascher - Learn Python and I found this as a solution to one of the exercises:

class Lunch:
def __init__(self):
self.cust = Customer()
self.empl = Employee()
def order(self, foodName):
# start a Customer order simulation
self.cust.placeOrder(foodName, self.empl)
def result(self):
# ask the Customer what kind of Food it has
self.cust.printFood()

class Customer:
def __init__(self):
# initialize my food to None
self.food = None
def placeOrder(self, foodName, employee):
# place order with an Employee
self.food = employee.takeOrder(foodName)
def printFood(self):
# print the name of my food
print self.food.name

class Employee:
def takeOrder(self, foodName):
# return a Food, with requested name
return Food(foodName)

class Food:
def __init__(self, name):
# store food name
self.name = name

if __name__ == '__main__':
x = Lunch()
x.order('burritos')
x.result()
x.order('pizza')
x.result()`


What I don't understand is how the definition of the method placeOrder inside the customer class works, more specifically, there is no class employee (just Employee) whose method placeOrder could be used.

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