python_para_desenvolvedores_2ed

132 Sobrecarga de operadores
float(self.__getitem__((x, y))))
r += '\n'
return r
if __name__ == '__main__':
mat = Mat()
print '2 itens preenchidos:'
mat[1, 2] = 3.14
mat[3, 4] = 4.5
print mat
print 'Troca e remoção:'
del mat[3, 4]
mat[1, 2] = 5.4
print mat
print 'Preenchendo a 3ª coluna:'
for i in xrange(1, 4):
mat[i + 1, 3] = i
print mat
print '3ª coluna:', mat.col(3)
print 'Fatia com 2ª a 3ª linha', mat[2:3]
print 'Somatório:', mat.sum(), 'Média', mat.avg()
Saída:
2 itens preenchidos:
Dim: (3, 4)
(1, 1) = 0.0 (1, 2) = 3.1 (1, 3) = 0.0 (1, 4) = 0.0
(2, 1) = 0.0 (2, 2) = 0.0 (2, 3) = 0.0 (2, 4) = 0.0
(3, 1) = 0.0 (3, 2) = 0.0 (3, 3) = 0.0 (3, 4) = 4.5
Troca e remoção:
Dim: (1, 2)
(1, 1) = 0.0 (1, 2) = 5.4
Preenchendo a 3ª coluna:
Dim: (4, 3)
(1, 1) = 0.0 (1, 2) = 5.4 (1, 3) = 0.0
(2, 1) = 0.0 (2, 2) = 0.0 (2, 3) = 1.0
(3, 1) = 0.0 (3, 2) = 0.0 (3, 3) = 2.0
(4, 1) = 0.0 (4, 2) = 0.0 (4, 3) = 3.0