Exercice 3:

>>> etoiles(0)
>>> etoiles(1)
*
>>> etoiles(2)
*
**
>>> etoiles(3)
*
**
***
>>> etoiles(4)
*
**
***
****

Exercice 4:

>>> simplifier([4, -2])
[-2, 1]
>>> simplifier([3, 14])
[3, 14]
>>> simplifier([0, 10])
[0, 1]

>>> somme([1, 2], [3, 4])
[5, 4]

>>> produit([2, 3], [7, 5])
[14, 15]

>>> division([2, 3], [7, 5])
[10, 21]


>>> egalite([3, 6], [1, 2])
True
>>> egalite([1, 2], [2, 3])
False

>>> tries([1, 2], [2, 3])
True

Exercice 5:

>>> singletons([])
[]
>>> singletons([2, 1, 2, 1, 3, 2, 1, 4])
[2, 1, 3, 4]

Exercice 6:

>>> croissante([2, 1, 2, 1, 3, 2, 1, 4])
False
>>> croissante([])
True
>>> croissante([1])
True
>>> croissante([1, 2])
True
>>> croissante([])
True
>>> croissante([1])
True
>>> croissante_ou_decroissante([2, 1, 2, 1, 3, 2, 1, 4])
False
>>> croissante_ou_decroissante([1, 2, 3, 4])
True
>>> croissante_ou_decroissante([4, 3, 2, 1])
True