pow(3, 4)

###

x = input("Enter your name: ")
print("Your name is", x)

###

x = "21"
print(2 * int(x))

###

# print returns None!
print("returned value:", print(10))

###

import tkinter

root = tkinter.Tk()
canvas = tkinter.Canvas(root, 
                        height=400, 
                        width=400)
canvas.configure(bd=0,
                 highlightthickness=0)
canvas.pack()

# write your code here
canvas.create_rectangle(10, 50, 110, 100, fill="green")

root.mainloop()