##############
# Times Tables
##############

# Imported Libraries
from tkinter import *
from tkinter import ttk

# Functions
def function ():
    try:
        whichtable = int(tableentry.get())
        howfar = int(howfarentry.get())
        a = 1
        answer.delete(0.0, END)
        while a <= howfar:
            text = ("{} x {} = {}\n".format(whichtable, howfar, howfar * whichtable)) 
            answer.insert(0.0, text)
            howfar = howfar - 1
    except:
        answer.delete (0.0, END)
        a = 1
        while a <= 5:
            answer.insert (END, "ERROR!\n")

def quitfunction ():
    root.destroy ()

# Fonts
calibri = (
        "Calibri",
        13,
        "bold"
    )

# Window
root = Tk ()
root.configure (background="#000000")

# Line Frame
lineframe = Frame (root, bg="#000000")
lineframe.pack ()

# Title Label
title = Label (root, text="Times Tables", bg="cyan", font=calibri)
title.pack (fill=X)

# Line Frame
lineframe = Frame (root, bg="#000000")
lineframe.pack ()

# Main Frame
mainframe = Frame (root, bg="#FFFFFF")
mainframe.pack (fill=X)

# Which Table Label
tablelabel = Label (mainframe, text="Which Times Table would you like to use?", bg="#FFFFFF")
tablelabel.pack (anchor="w")

# Which Table Entry
tableentry = ttk.Entry (mainframe, textvariable=StringVar)
tableentry.pack ()

# How Far Label
howfarlabel = Label (mainframe, text="How far would you like to go in that times table?", bg="#FFFFFF")
howfarlabel.pack (anchor="w")

# How Far Entry
howfarentry = ttk.Entry (mainframe, textvariable=StringVar)
howfarentry.pack ()

# Space Label
space = Label (mainframe, bg="#FFFFFF")
space.pack ()

# Line Frame 2
lineframe2 = Frame (root, bg="#000000")
lineframe2.pack ()

# Go Button
go = Button (root, text="Go", bg="green", command=function, font=("Ubuntu", 11, "bold"))
go.pack (fill=X)

# Answer Frame
ansframe = Frame (root)
ansframe.pack ()

# Scrollbar
scroll = ttk.Scrollbar (ansframe)
scroll.pack (side="right", fill=Y, anchor="e")

# Answer Text
answer = Text (ansframe, bg="cyan", height="4", width="27", yscrollcommand=scroll.set, font=calibri)
answer.pack (anchor="w", fill=X)
scroll.config (command = answer.yview)

# Line Frame
lineframe = Frame (root, bg="#000000")
lineframe.pack ()

# Line Frame
lineframe = Frame (root, bg="#000000")
lineframe.pack ()

# Line Frame
lineframe = Frame (root, bg="#000000")
lineframe.pack ()

# Quit Button
quitbtn = Button (root, bg="red", text="Quit", command=quitfunction, font=("Calibri", 12, "bold"))
quitbtn.pack (anchor="e")

# Line Frame
lineframe = Frame (root, bg="#000000")
lineframe.pack ()

# Loop
root.mainloop ()