Change List with a python function

Question

I’m developing some book exercises "Intensive Course of Python" but I stopped in the proposed 8.10 exercise:

EX: 8.10 - Great magicians: Start with a copy of your program from Exercise 8.9. Write a function named make_great() that modifies the list of magicians adding the expression the Great to each magic. Call show_magicians() to see if the list has actually been modified.

My 8.9 exercise program went like this:

  print("===================== EX-01 ================")
  magicos = ["Mario", "João", "Maria"]
  '''Exibe uma saudação aos magicos'''
  def nomes_dos_magicos(nome):
      for magico in magicos:
          print("Olá,", magico)

saudacao = nomes_dos_magicos(magicos)

My difficulty is in storing that new "Big" value before the names inside the original list and not just in the function

Answer 1

You can also use the function range:

print("===================== EX-01 ================")
magicos = ["Mario", "João", "Maria"]
'''Exibe uma saudação aos magicos'''
def nomes_dos_magicos():
    for i in range(len(magicos)):
        magicos[i] = "O Grande " + magicos[i]

nomes_dos_magicos()
print(magicos)

Or, if you want to use comprehensilist on, the function is thus:

def nomes_dos_magicos():
    global magicos
    magicos = ["O Grande " + magico for magico in magicos]

Note that in practice it is unnecessary to define a function if you use comprehensilist on in the latter case. But, as it is an exercise, this is it.

Answer 2

For this, it is necessary to change the value of the variable mágicos when calling the function nomes_dos_magicos.

Here I use the function enumerate to access the list entry when we are doing the for loop:

print("===================== EX-01 ================")
magicos = ["Mario", "João", "Maria"]
'''Exibe uma saudação aos magicos'''
def nomes_dos_magicos(nome):
  for i, nome in enumerate(magicos):
      magicos[i] = "O Grande " + nome

nomes_dos_magicos(magicos)
print(magicos)