程序代写代做代考 Programming Exercise 3-1

Programming Exercise 3-1

Programming Exercise 13-3

import tkinter

class MilesGUI:

def __init__(self):

# Create the main window

self.main_window = tkinter.Tk()

# Create four frames

self.gallons_frame = tkinter.Frame(self.main_window)

self.miles_frame = tkinter.Frame(self.main_window)

self.mpg_frame = tkinter.Frame(self.main_window)

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

# Create the widgets for the gallons frame

self.gallons_label = tkinter.Label \

(self.gallons_frame, \

text = ‘Enter the number of gallons:’)

self.gallons_entry = tkinter.Entry(self.gallons_frame, width = 10)

# Pack the gallons frame widgets

self.gallons_label.pack(side = ‘left’)

self.gallons_entry.pack(side = ‘left’)

# Create the widgets for the miles frame

self.miles_label = tkinter.Label \

(self.miles_frame, \

text = ‘Enter the number of miles:’)

self.miles_entry = tkinter.Entry(self.miles_frame, width = 10)

# Pack the miles frame widgets

self.miles_label.pack(side =’left’)

self.miles_entry.pack(side = ‘left’)

# Create the widgets for the mpg frame

self.result_label = tkinter.Label \

(self.mpg_frame, \

text = ‘Miles Per Gallon = ‘)

# Create a blank label

self.mpg = tkinter.StringVar()

self.mpg_label = tkinter.Label(self.mpg_frame, \

textvariable= self.mpg)

# Pack the mpg frame widgets

self.result_label.pack(side = ‘left’)

self.mpg_label.pack(side = ‘left’)

# Create the two buttons in the bottom frame

self.mpg_button = tkinter.Button \

(self.bottom_frame, \

text = ‘Calculate MPG’, \

command = self.calculate_mpg)

self.quit_button = tkinter.Button \

(self.bottom_frame, \

text = ‘Quit’, \

command = self.main_window.destroy)

# Pack the widgets in the bottom frame

self.mpg_button.pack(side=’left’)

self.quit_button.pack(side=’left’)

# Pack the frames

self.gallons_frame.pack()

self.miles_frame.pack()

self.mpg_frame.pack()

self.bottom_frame.pack()

# Enter the tkinter main loop

tkinter.mainloop()

# Define the show_info function

def calculate_mpg(self):

# Get the values entered

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

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

# Calculate mpg

self.miles_per_gallon = float(self.miles) / self.gallons

# Update the mpg_label

self.mpg.set(self.miles_per_gallon)

# Create an instance of MilesGUI

mpg = MilesGUI()