Python中GUI的问题

我正在开发一个GUI，在这里我必须计算每加仑汽车的英里数。我一直收到一个语法错误，但我不确定我做错了什么，这里是我的代码：我编辑它以反映一些更正

class GasMileage:
 def__init__(self)
        #Create main window
        self.main_window = tkinter.Tk()

        #Create 4 frames
        self.gallons_frame = tkinter.frame(self.main_windown)
        self.miles_frame = tkinter.frame(self.main_windown)
        self.button_frame = tkinter.frame(self.main_windown)
        self.mpg_frame = tkinter.frame(self.main_window)

        #Create and pack widgets Gallons and Miles

        self.gallons_label = tkinter.Label(self.gallons_frame, \
                                           text "Enter # of Gallons Used")
        self.gallons_entry = tkinter.Entry(self.gallons_frame, \
                                           width = 10)

        self.miles_label.pack(side='left')
        self.miles_entry.pack(side='left')

        self.miles_label = tkinter.Label(self.miles_frame, \
                                           text="Enter miles traveled")
        self.miles_entry = tkinter.Entry(self.miles_frame, \
                                           width = 10)

        self.miles_label.pack(side='left')
        self.miles_entry.pack(side='left')

        self.result_label = tkinter.Label(self.mpg_frame, \
                                          text='MPG=')
        self.mpg = tkinter.StringVar()
        self.mpg_label = tkinter.Label(self.mpg_frame, \
                                       textvariable=self.mpg)
        self.result_label.pack (side='left')
        self.mpg_label.pack(side='left')

        #Create and pack button Widgets

        self.calc_button = tkinter.Button(self.button_frame, \
                                          text='Calculate MPG', \
                                          command=self.calc_gallons)

        self.quit_button = tkinter.Button(self.button_frame, \
                                          text='Exit', \
                                          command=self.main_window.destroy)
        self.calc_button.pack(side='left')
        self.quit_button.pack(side='left')

        #Pack the frames

        self.gallons_frame.pack()
        self.miles_frame.pack()
        self.buttons_frame.pack()
        self.mpg_frame.pack()

        tkinter.mainloop()

        #Calculate Miles per Gallon

        def calc_gallons(self):

            self.gallons = float(self.gallons_entry.get())
            self.miles = float(self.miles_entry.get())

            #Calculate Miles per Gallon

            self.mpg = self.miles / self.gallons

        gas_miles = GasMileage()

---

我修改了你的代码，但它充满了错误和不一致。现在，至少它编译并执行：

import tkinter



class GasMileage:

    def __init__(self):
        #Create main window
        self.main_window = tkinter.Tk()

        #Create 4 frames
        self.gallons_frame = tkinter.Frame(self.main_window)
        self.miles_frame = tkinter.Frame(self.main_window)
        self.button_frame = tkinter.Frame(self.main_window)
        self.mpg_frame = tkinter.Frame(self.main_window)

        #Create and pack widgets Gallons and Miles

        self.gallons_label = tkinter.Label(self.gallons_frame, 
                                           text = "Enter # of Gallons Used")
        self.gallons_entry = tkinter.Entry(self.gallons_frame, 
                                           width = 10)


        self.gallons_label.pack(side='left')
        self.gallons_entry.pack(side='left')                



        self.miles_label = tkinter.Label(self.miles_frame,
                                           text = "Enter miles traveled")
        self.miles_entry = tkinter.Entry(self.miles_frame, 
                                           width = 10)

        self.miles_label.pack(side='left')
        self.miles_entry.pack(side='left')        


        self.result_label = tkinter.Label(self.mpg_frame,  text='MPG=')
        self.mpg = tkinter.StringVar()
        self.mpg_label = tkinter.Label(self.mpg_frame, 
                                       textvariable=self.mpg)
        self.result_label.pack (side='left')
        self.mpg_label.pack(side = 'left')

        #Create and pack button Widgets

        self.calc_button = tkinter.Button(self.button_frame, 
                                          text='Calculate MPG', 
                                          command=self.calc_gallons)

        self.quit_button = tkinter.Button(self.button_frame, 
                                          text='Exit',
                                          command=self.main_window.destroy)
        self.calc_button.pack(side='left')
        self.quit_button.pack(side='left')

        #Pack the frames

        self.gallons_frame.pack()
        self.miles_frame.pack()
        self.button_frame.pack()
        self.mpg_frame.pack()

        tkinter.mainloop()

    #Calculate Miles per Gallon


![enter image description here][1]

    def calc_gallons(self):

        self.gallons = float(self.gallons_entry.get())
        self.miles = float(self.miles_entry.get())

        print(self.gallons, self.miles)

        #Calculate Miles per Gallon

        self.mpg = self.miles / self.gallons
        self.result_label['text'] = "'MPG = '{:0.2f}".format(self.mpg)

gas_miles = GasMileage()

截图：

---

很奇怪：def_uuinit_uuself应该是def_uuinit_uuself：实际的错误很容易知道它说的唯一一件事是无效语法，这是我得到的唯一错误必须有一个回溯我能问一下为什么它被否决吗？答案解决了OP的所有语法错误。截图就是证明。我不确定，但谢谢你的帮助