无法在Python 3.2

Question

链接类和Tkinter的这是我的代码：

from tkinter import * 

class Car: 

    def __init__(self, car_id, name, num_seats, available): 

     self.car_id = car_id 
     self.name = name 
     self.num_seats = num_seats 
     self.available = available 
     available_cars.append(self.name) 


    def hire_car(self): 
     self.available = False 
     booked_cars.append(self.name) 
     available_cars.remove(self.name) 



    def return_car(self): 
     self.available = True 
     booked_cars.remove(self.name) 
     available_cars.append(self.name) 

    def display(): 
     pass 

class Carlist: 

    def __init__(self, available_cars): 

     self.available_cars = available_cars 

    def addCar(): 
     pass 

    def displayAvailable(): 
     print(available_cars) 


    def displayBooked(): 
     print(booked_cars) 


booked_cars = [] 
available_cars = [] 

Car(1,"Suzuki Van", 2, True) 
id2 = Car(2,"Toyota Corolla", 4, True) 
id3 = Car(3,"Honda Crv", 4, True) 
id4 = Car(4,"Suzuki Swift", 4, True) 
id5 = Car(5,"Mitsibishi Airtrek", 4, True) 
id6 = Car(6,"Nissan DC Ute", 4, True) 
id7 = Car(7,"Toyota Previa", 7, True) 


Car.hire_car(id3) 


Carlist.displayAvailable() 
Carlist.displayBooked() 


#Interface Code 

root = Tk() 
root.title("Car Booking System") 



frameTop = Frame(root) 
frameLeft = Frame(root) 
frameRight = Frame(root) 
frameBottom = Frame(root) 

#Top 
topLabel = Label(frameTop, text = "Car Booking System", font = 20).pack() 

#Right Side 
bookLabel = Label(frameRight, text = "Book:").pack() 

varSelectedCar = StringVar() 
varSelectedCar.set(available_cars[0]) 
optionHire = OptionMenu(frameRight, varSelectedCar, *available_cars).pack() 

buttonHireCar = Button(frameRight, text = "Enter", command = Car.hire_car).pack() 

#Left Side 
returnLabel = Label(frameLeft, text = "Return:").pack() 

varSelectedCar2 = StringVar() 
varSelectedCar2.set(booked_cars[0]) 
optionReturn = OptionMenu(frameLeft, varSelectedCar2, *booked_cars).pack() 

buttonHireCar2 = Button(frameLeft, text = "Enter", command = Car.hire_car).pack() 
#Bottom 
summaryLabel = Label(frameBottom, text = "Summary:").pack() 



#INITIALISATION 
frameTop.pack(side = TOP) 
frameLeft.pack(side = LEFT) 
frameRight.pack(side = RIGHT) 
frameBottom.pack(side = BOTTOM) 
root.mainloop() 

我试图名单链接到GUI界面，以便时输入点击，要么运行hire_car或return_car，并增加了他们的名字到相关清单。任何想法如何做到这一点？帮助将不胜感激。

的总体思路是有一个程序，它可以预订和返回的汽车和在底部的总结....

Answer 1

虽然这个网站是不是让其他的功课，你今天真的很幸运。但是，请尝试弄清楚它是如何工作的。如何更新OptionMenu信息是从HERE。

from collections import namedtuple 
from tkinter import * 

Car = namedtuple('Car', 'name num_seats') 

class CarList: 

    ID = 0 

    def __init__(self): 
     self.cars, self.hired = {}, set() 

    def add_car(self, car): 
     self.cars[self.ID] = car 
     self.ID += 1 

    def available_cars(self): 
     '''Returns the list of (id, Car) tuples sorted by Car.''' 
     return sorted(((car, id) 
      for id, car in self.cars.items() 
      if id not in self.hired)) 

    @staticmethod 
    def labels(cars_seq): 
     return ['{} [{}]'.format(t[0].name, t[1]) 
      for t in cars_seq] 

    def hire_car(self, id): 
     if id in self.hired: 
      raise ValueError('That car is already hired.') 
     self.hired.add(id) 

    def hired_cars(self): 
     return sorted(((self.cars[id], id) 
      for id in self.hired)) 

    def return_car(self, id): 
     if id not in self.hired: 
      raise ValueError('That car is not even hired.')   
     self.hired.remove(id) 

def add_car(car): 
    if not isinstance(car, Car): 
     raise TypeError('Invalid car object.') 
    carlist.add_car(car) 
    update_optionmenus() 

def hire_car(): 
    label = opt_hire.var.get() 
    if label: 
     id = int(label.rsplit(maxsplit=1)[-1][1:-1]) 
     carlist.hire_car(id) 
     update_optionmenus() 

def return_car(): 
    label = opt_return.var.get() 
    if label: 
     id = int(label.rsplit(maxsplit=1)[-1][1:-1]) 
     carlist.return_car(id) 
     update_optionmenus() 

def _update_optionmenu(opt_menu_widget, car_seq): 
    cars = carlist.labels(car_seq) 
    if cars: 
     opt_menu_widget.var.set(cars[0]) 
    else: 
     opt_menu_widget.var.set('') 
    opt_menu_widget['menu'].delete(0, END) 
    for lab in cars: 
     opt_menu_widget['menu'].add_command(label=lab, 
      command=lambda lab=lab: opt_menu_widget.var.set(lab)) 

def update_optionmenus(): 
    _update_optionmenu(opt_hire, carlist.available_cars()) 
    _update_optionmenu(opt_return, carlist.hired_cars())  

# You have to initiate a carlist to make it work. 
carlist = CarList() 

#Interface Code 
root = Tk() 
root.title('Car Booking System') 
frame_top = Frame(root) 
frame_top.pack(side = TOP) 
frame_left = Frame(root) 
frame_left.pack(side = LEFT) 
frame_right = Frame(root) 
frame_right.pack(side = RIGHT) 
frame_bottom = Frame(root) 
frame_bottom.pack(side = BOTTOM) 

#Top 
label_top = Label(frame_top, text = 'Car Booking System', 
    font = 20).pack() 

#Right Side 
label_hire = Label(frame_right, text = 'Book:', width=25).pack() 
gui_var_hire = StringVar() 
opt_hire = OptionMenu(frame_right, gui_var_hire, 'anything') 
opt_hire.var = gui_var_hire 
del gui_var_hire 
opt_hire.pack()  
button_hire = Button(frame_right, text = 'Enter', 
    command = hire_car).pack() 

#Left Side 
label_return = Label(frame_left, text = 'Return:', width=25).pack() 
gui_var_return = StringVar() 
opt_return = OptionMenu(frame_left, gui_var_return, 'anything') 
opt_return.var = gui_var_return 
opt_return.pack() 
del gui_var_return 
button_return = Button(frame_left, text = 'Enter', 
    command = return_car).pack() 

#Bottom 
label_summary = Label(frame_bottom, text = 'Summary:').pack() 

add_car(Car('Suzuki Van', 2)) 
add_car(Car('Toyota Corolla', 4)) 
add_car(Car('Honda Crv', 4)) 
add_car(Car('Suzuki Swift', 4)) 
add_car(Car('Mitsibishi Airtrek', 4)) 
add_car(Car('Nissan DC Ute', 4)) 
add_car(Car('Toyota Previa', 7)) 
add_car(Car('Honda Crv', 2)) 
root.mainloop()