Tkinter from skratch 1: make a window

To make a window in tkinter you must write the following code on notepad and save it as a file.py file, or with another name:

# this is a comment, the interpreter does not matter about this
# to write a comment, simply start with an hastag symbol, i.e. '#'
# You need to import tkinter, a buil-in module, there's no
# need to install anything
# I imported tkinter as tk, so now I can load tkinter's variables, functions and classes
# using tk followd by a dot and then the name of the variable, function etc.

import tkinter as tk

root = tk.Tk()

root.mainloop()

# that's all, the window is ready to show up

This is the output