I am using Python but I Keep recieving "NameError: name 'SERVICES' is not defined". I need help getting the total charges to display when I run the program.

Exercise: Joe's Automotive: Joe's Automotive performs the following routine maintenance services: Oil change-$30.00 Lube Job-$20.00 Radiator flush-$40.00 Transmission flush-$100.00 Inspection-$35.00 Muffler replacement-$200.00 Tire Rotation-$20.00. Write a GUI program with check buttons that allow the user to select any or all of these services. When the user clicks a button, the total charges should be displayed.

Below is my code:

# 13-6 Joe's Automotive import tkinter

Joe_Services = [('Oil Change', 30.00), ('Lube Job', 20.00), ('Radiator Flush', 40.00), ('Transmission Flush', 100.00), ('Inspection', 35.00), ('Muffler Replacement', 200.00), ('Tire Rotation', 20.00)]

class MyApp(tkinter.Frame): def __init__(self, master=None): tkinter.Frame.__init__(self, master) self.pack()

self.main_window = root self.top_frame = tkinter.Frame(self) self.bottom_frame = tkinter.Frame(self)

# Create list of control variables to query state of CheckButtons. self.cb_vars = [tkinter.IntVar() for _ in range(len(Joe_Services))]

# Create another list to hold a corresponding Checkbuttons. self.cbs = [ tkinter.Checkbutton( self.top_frame, text='{}-${:.2f}'.format(Joe_Services[i][0], Joe_Services[i][1]), variable=self.cb_vars[i]) for i in range(len(self.cb_vars)) ] # Pack the Checkbuttons. for i in range(len(self.cbs)): self.cbs[i].pack()

#Create an total button and Quit button. self.ok_button = tkinter.Button(self.bottom_frame, text='total', command=self.show_choice) self.quit_button = tkinter.Button(self.bottom_frame, text='Quit', command=self.main_window.destroy)

#Pack the buttons. self.ok_button.pack(side = 'left') self.quit_button.pack(side = 'left')

#Pack frames. self.top_frame.pack() self.bottom_frame.pack()

def show_choice(self): popup_window = tkinter.Toplevel() label_frame = tkinter.LabelFrame(popup_window, text='Total Charges') label_frame.pack() # Add up the cost of all the items which are checked. total = sum(SERVICES[i][1] for i in range(len(self.cb_vars)) if self.cb_vars[i].get()) tkinter.Label(label_frame, text='${:.2f}'.format(total)).pack() # Enter a local mainloop and wait for window to be closed by user. root.wait_window(popup_window)

root = tkinter.Tk() app = MyApp(root) app.master.title('SERVICES PROVIDED BY JOE') app.mainloop()

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