Réponse :

Explications :

A = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

B = [[0, 0, 0], [0, 0, 0], [0, 0, 0]]

for i in range(3):

   for j in range(3):

       B[i][j] = A[j][i]

print("B = ", B)

ce bout de programme retourne :

B =  [[1, 4, 7], [2, 5, 8], [3, 6, 9]]

L = [[2, 7], [4, 1], [5, 1], [3, 5], [1, 11], [2, 4]]

def triDecroissant(list):

   for i in range(len(list)):

       for j in range(i + 1, len(list)):

           if list[i][0] < list[j][0]:

               VarTemp = list[i]

               list[i] = list[j]

               list[j] = VarTemp

   return list

print("triDecrossant de L = ", triDecroissant(L))

Python console

B =  [[1, 4, 7], [2, 5, 8], [3, 6, 9]]

triDecrossant de L =  [[5, 1], [4, 1], [3, 5], [2, 7], [2, 4], [1, 11]]