我的函数menu. displayhomenu (m)陷入了无限循环.为什么?

Question

在下面的代码中，我希望菜单显示并提示用户进行选择。在选择的基础上，我想继续讨论下面的if语句，这些语句允许用户定义其车辆的属性。在我将菜单放入函数之前，代码可以工作，但我的作业需要这种格式。没有错误。它只是一遍又一遍地提示选择。有什么建议吗?

class Menu: 
""" Create a Menu """
def __init__(self):
self.selection = selection
def displayHomeMenu(self):
if 2 == vehicleCount:
print("----Press 1 for car ")
print("----Press 2 for pickup ")
selection = input("----Press 3 to quit ")
return selection
else: 
print("----Press 1 for car ")
selection = input("----Press 2 for pickup ")
return selection
class Vehicle:
""" Model a vehicle"""
def __init__(self, make = " ", model = "n/a", color = "n/a ", fuelType = "n/a ", *options):
""" Initialize vehicle attributes """
self.make = make
self.model = model
self.color = color
self.fuelType = fuelType
self.options = {"power windows", "powerlocks", "remote start", "backup camera", "bluetooth", "cruise control", "heated seats", "heated steering wheel"}

def getMake(self):
self.make = input("Please enter your make ")
return self.make
def getModel(self):
self.model = input("Please enter your model ")
return self.model
def getColor(self):
self.color = input("Please enter the color ")
return self.color
def getFuelType(self):
self.fuelType = input("Please enter your fuel type ")
return self.fuelType
def getOptions(self):
print("Please select from the following options: ")
input(self.options)
return self.options

class Car(Vehicle):
"""Represents a car"""
def __init__(self, make = "n/a ", model = "n/a", color = "n/a ", fuelType = "n/a "):
super().__init__(make, model, color, fuelType)
""" Initialize car attributes"""
self.engineSize = " "
self.numDoors = " "
def getEngineSize(self):
self.engineSize = input("Please enter your engine size ")
return self.engineSize
def getNumDoors(self):
self.numDoors = input("How many doors do you have ")
return self.numDoors
class pickup(Vehicle):
"""Represents a pickup"""
def __init__(self, make = " ", model = " ", color = " ", fuelType = " "):
super().__init__(make, model, color, fuelType)
""" Initialize pickup attributes """
self.cabStyle = " "
self.bedLength = " "
def getCabStyle(self):
self.cabStyle = input("Please enter your cab style ")
def getBedLength(self):
self.bedLength = input("Please enter the length of your bed ")
i = 0
list = []
vehicleCount = 0
carCount = 0
pickupCount = 0
selection = 0
while True:
vehicleCount = pickupCount + carCount      

m = Menu()
Menu.displayHomeMenu(m)
if selection == "1":
# Processing for item found
c = Car(Vehicle)
Vehicle.getMake(c)
Vehicle.getModel(c)
Vehicle.getColor(c)
Vehicle.getFuelType(c)
Car.getEngineSize(c)
Car.getNumDoors(c)
newcar = vars(c)
list.append(newcar)
if carCount < 1:
carCount = carCount + 1
else:
pass
elif selection == "2":
# Processing for item not found
p = pickup(Vehicle)
Vehicle.getMake(p)
Vehicle.getModel(p)
Vehicle.getColor(p)
Vehicle.getFuelType(p)
pickup.getCabStyle(p)
pickup.getBedLength(p)
newpickup = vars(p)
list.append(newpickup)
if pickupCount < 1:
pickupCount = pickupCount + 1
else:
for i in list:
print(i)

Answer 1

您没有使用displayHomeMenu()的返回值:

while True:
vehicleCount = pickupCount + carCount      

m = Menu()
selection = m.displayHomeMenu()   # Assign the return value to selection
if selection == "1":
# Processing for item found
c = Car(Vehicle)
Vehicle.getMake(c)
Vehicle.getModel(c)
Vehicle.getColor(c)
Vehicle.getFuelType(c)
Car.getEngineSize(c)
Car.getNumDoors(c)
newcar = vars(c)
list.append(newcar)
if carCount < 1:
carCount = carCount + 1
else:
pass
elif selection == "2":
# Processing for item not found
p = pickup(Vehicle)
Vehicle.getMake(p)
Vehicle.getModel(p)
Vehicle.getColor(p)
Vehicle.getFuelType(p)
pickup.getCabStyle(p)
pickup.getBedLength(p)
newpickup = vars(p)
list.append(newpickup)
if pickupCount < 1:
pickupCount = pickupCount + 1
else:
for i in list:
print(i)