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"""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_twice, 'spam')

print('')

do_four(print_twice, 'spam')