python trouver l'élément dans la liste
>>> ["foo", "bar", "baz"].index("bar")
1
Cook's Tree Boa
>>> ["foo", "bar", "baz"].index("bar")
1l = [1, 2, 3, 4, 5, 6, 7, 8, 9]
index_of_4 = l.index(4)
print(index_of_4)
##output:
## 3