Tkinter

comes inbuilt with every Python setup

 import tkinter  #Tkinter in py2
 m = tkinter.Tk()
 #add stuff here
 m.mainloop()

arranging the window
1. pack() //simple pack elements
2. grid() //specific grids
3. place() //custom placement eg: widget.pack()

to set canvas settings

canv = tkinter.Canvas(master, **kwargs)
canv.pack()

Widgets:
- Label(parent, **kwargs)
- Canvas(parent, **kwargs)

To overwrite basic Tk widgets:

 from tkinter import *
 from tkinter.ttk import *

Widgets available: Button, Checkbutton, Entry, Frame, Label, LabelFrame, Menubutton, PanedWindow, Radiobutton, Scale and Scrollbar

Passing args to event in tkinter combobox:

 def onselection(event, id):
 	print("selected combobox ID#",id)
 ...
 cbox = Combobox(...)
 cbox.bind("<<ComboboxSelected>>", lambda event, id=i : onselection(event, id)
 ...

Multiple elements in a grid cell

 #main window
 root = Tk()
 
 #frames 3X
 f10 = Frame(root)
 f11 = Frame(root)
 F12 = Frame(root)
 f10.grid(row=1, column=0)
 f11.grid(row=1, column=1)
 f12.grid(row=1, column=2)
 
 #buttons all inside f11 cell
 b1 = Button(f11)
 b2 = Button(f11)
 b3 = Button(f11)
 b1.pack()
 b2.pack()
 b3.pack()