"""This module contains a code example related to
Think Python, 2nd Edition
by Allen Downey
http://thinkpython2.com
Copyright 2015 Allen Downey
License: http://creativecommons.org/licenses/by/4.0/
"""
from __future__ import print_function, division
def do_twice(func, arg):
"""Runs a function twice.
func: function object
arg: argument passed to the function
"""
func(arg)
func(arg)
def print_twice(arg):
"""Prints the argument twice.
arg: anything printable
"""
print(arg)
print(arg)
def do_four(func, arg):
"""Runs a function four times.
func: function object
arg: argument passed to the function
"""
do_twice(func, arg)
do_twice(func, arg)
do_twice(print, 'spam')
print('')
do_four(print, 'spam')
