Question

Why won't my python code open the GUI window when I run the module?

Here's my code:

import tkinter

class MPGGui:
def ___init___ (self):

self.main_window = tkinter.Tk ()

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

self.gallons_label = tkinter.Label(self.top_frame, \
text = "Gallons: ")
self.gallons_entry = tkinter.Entry(self.top_frame, \
width=10)
self.gallons_label.pack(side='left')
self.gallons_entry.pack(side='left')

self.miles_label = tkinter.Label(self.top_frame, \
text = "Miles")
self.miles_entry = tkinter.Entry(self.top_frame, \
width=10)

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

self.calc_button = tkinter.Button(self.bottom_frame, \
text='Calculate' , \
command=self.convert)
self.quit_button = tkinter.Button(self.bottom_frame, \
text='Quit' , \
command=self.main_window.destroy)
self.calc_button.pack(side='left')
self.quit_button.pack(side='left')

self.top_frame.pack()
self.bottom_frame.pack()

tkinter.mainloop()

def convert(self):
gallon = float(self.gallons_entry.get())
mile = float(self.miles_entry.get())
ave = mile / gallon
tkinter.messagebox.showinfo('Results' , "The miles per gallon is" + str(ave) + "mpg")

mpg = MPGGui()

Answer 1

i have bolted the error:

Here is code:

import tkinter

from tkinter import messagebox

class MPGGui:

def __init__ (self):

self.main_window = tkinter.Tk ()

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

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

self.gallons_label = tkinter.Label(self.top_frame, \

text = "Gallons: ")

self.gallons_entry = tkinter.Entry(self.top_frame, \

width=10)

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

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

self.miles_label = tkinter.Label(self.top_frame, \

text = "Miles")

self.miles_entry = tkinter.Entry(self.top_frame, \

width=10)

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

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

self.calc_button = tkinter.Button(self.bottom_frame, \

text='Calculate' , \

command=self.convert)

self.quit_button = tkinter.Button(self.bottom_frame, \

text='Quit' , \

command=self.main_window.destroy)

self.calc_button.pack(side='left')

self.quit_button.pack(side='left')

self.top_frame.pack()

self.bottom_frame.pack()

tkinter.mainloop()

def convert(self):

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

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

ave = mile / gallon

messagebox.showinfo('Results' , "The miles per gallon is " + str(ave) + " mpg")

mpg = MPGGui()

Output: