Python usually uses a third-party library like numpy to do calculations, which improves efficiency, speed and memory usage. If you write like this.

Number of rows = 18

cols= 10

Matrix = []

For I in xrange(0, line):

matrix.append([])

For j in xrange(0, cols):

Matrix [i]. Add (0)

Matrix [5][6]=3344

If you use numpy, this is its strength. There are examples in the tutorial. Copy them.

& gt& gt& gt from numpy import *

& gt& gt& gta = arange( 15)。 Plastic surgery (3, 5)

& gt& gt& gta

Array ([[ 0, 1, 2, 3, 4],

[ 5, 6, 7, 8, 9],

[ 10, 1 1, 12, 13, 14]])

There is also a tutorial here: http://hyry.dip.jp:8000/pydoc/numpy_intro.html.