def prix_ttc(ht, taux=21):
    return ht * (1 + taux / 100)

mots = phrase.split()
for mot in mots:
    print(mot.upper())

total = 0
for note in notes:
    total = total + note
moyenne = total / len(notes)

SELECT nom, COUNT(*) AS n
FROM commandes
GROUP BY nom
HAVING n > 3;

inverse = ""
for i in range(len(mot) - 1, -1, -1):
    inverse = inverse + mot[i]

if "a" <= c <= "z":
    majuscule = chr(ord(c) - 32)