Terminating an exe built from a GUI in python from Background Processes - user-interface

Question

I created a simple GUI in python 3.4 using tkinter 8.5. I used cx_freeze to build an exe from this GUI. Now when I run this exe, sometimes I notice that the program still shows under 'Background Processes' in Task Manager even after I terminate it using a Quit button or using the close button in the window.
The GUI works like this: You select a file type from a drop down list, read the file using a command button and save it as a separate file. Now this problem happens only if I close the GUI after using it. If I simply open the GUI and close it using the Quit button or close button, it does not stay as a background process.
Is it normal for it to behave like this? If not what can I do to terminate it properly?
The simplified code for the GUI is given below. The function 'fileselect' calls functions from the module 'dataselect'. If needed, I will provide the code for the 'dataselect' module also.
from dataselect import *
from openpyxl import Workbook
from tkinter import *
from tkinter import ttk, filedialog
root = Tk()
root.title("Select Data File")
# Actual File Selection based on Combobox Selection
def fileselect():
file_type = filetype.get()
if file_type == ".txt":
text = selecttxt()
textfile = filedialog.asksaveasfile(mode='w', defaultextension=".txt")
for line in text:
for number in line:
textfile.write(str(number)+" ")
textfile.write('\n')
elif file_type == ".xlsx":
excel = selectxlsx()
excelfile = filedialog.asksaveasfile(mode='w', defaultextension=".xlsx")
excelfilename = excelfile.name
excelbook = Workbook()
excelsheet = excelbook.active
rows = 0
for excel_row in excel:
cols = 0
for excel_cell in excel_row:
excelsheet.cell(row=rows, column=cols).value = excel[rows][cols]
cols += 1
rows += 1
excelbook.save(excelfilename)
def quit():
global root
root.destroy()
# Select the File Type to be opened (.txt or .xlsx for now)
ttk.Label(root, text="Please select the file type").grid(column=2, row=1)
filetype = StringVar()
sel_type = ttk.Combobox(root,values=('.txt','.xlsx'),textvariable=filetype)
sel_type.grid(column=2,row=2,sticky=E)
# Command Button for Opening File
cb_open = ttk.Button(root, text="Select File", command=fileselect)
cb_open.grid(column=2, row=3)
# Command Button for Quitting GUI
cb_quit = ttk.Button(root, text="Quit", command=quit)
cb_quit.grid(column=1, row=3)
root.mainloop()

Answer 1

There are two things you need to change:
1) Add sys.exit() to your quit method
def quit():
root.quit
root.destroy
sys.exit()
2) Add protocol to your root
root.protocol("WM_DELETE_WINDOW", quit)
Finally, don't forget to import sys.