import tkinter			#<imports kinter module
from tkinter import *   #<and * from the tkinter module
from tkinter import Tk  #<and Tk from the tkinter module
import sys#imports sys (allows to use functions such as timesleep

convert_formula = 25.4#the number needed to divide by to convert MM to Inches as a variable
root = Tk()#sets root = Tk()
root.title('Converter')#creates a title in the Tk Widget
Label(text = 'Welcome to the converter').pack(side = TOP, padx = 10, pady = 10)#Just a little intro in the Tk widget

def convert(Num_In_MM):#This is the conversion function, sets the rules and restrictions when converting a unit of measure from MM to Inches
	Num_In_MM = float(e.get())#Gets user input from the entry widget created by tkinter (see below)
	Results = ("%.3f" % (Num_In_MM / convert_formula))#creates a variable from the users input divided by convert_fomula(25.4) and saves the results to the 3rd decimal places (thousanths)
	print(Results)#Prints the float stored in the variable Results

def quit():#Creates a quit function for the quit button on the Tk Widget
	global root
	root.destroy()#destroys the widget(closes it)

e = Entry(root, width = 5)#Creates an entry box to get user input
e.bind('<Return>', convert)#binds the entry box to <Return> (Enter key) so the user can hit enter to get the results
e.pack(side = TOP, padx = 10, pady = 10)#this just packs the widget

Button(root, text='quit', command=quit).pack(side= RIGHT)#creates a quit button on the widget

root.mainloop()