Question

I’m reading an exercise out of a Python book, here is what it says:

Modify do_twice so that it takes two arguments, a function object and a value, and calls the function twice, passing the value as an argument.

Write a more general version of print_spam, called print_twice, that takes a string as a parameter and prints it twice.

Use the modified version of do_twice to call print_twice twice, passing ‘spam’ as an argument.

Heres what I wrote:

def do_twice(f, g):
    f(g)
    f(g)

def print_spam(s):
    print (s)

do_twice(print_spam('lol'))

What is the way it is supposed to be written? I’m totally stumped on this one.

Answer 1

Just give the string as a second argument to do_twice. The do_twice functions calls the print_spam and supplies the string as an argument:

def do_twice(f, g):
    f(g)
    f(g)

def print_spam(s):
    print (s)

do_twice(print_spam,'lol')

prints:

lol
lol