How to do matrix input in python

Question

Using any way

Answer 1

>>> lst = list(range(-10,21,5))
>>> lst
[-10, -5, 0, 5, 10, 15, 20]
fills a list lst with numbres from -10 up to 20 with numbers in step of 5

>>> lst.append('a, b, c')
>>> lst
[-10, -5, 0, 5, 10, 15, 20, 'a, b, c']
appends 3 new elements

>>> lst.insert(2, 'XX')
>>> lst
[-10, -5, 'XX', 0, 5, 10, 15, 20, 'a, b, c']
inserts a new element at index 2

>>> lst[4] = 55
>>> lst
[-10, -5, 'XX', 0, 55, 10, 15, 20, 'a, b, c']
list element with index 4 will be peplaced with 55

>>> lst.remove(20)
>>> lst
[-10, -5, 'XX', 0, 55, 10, 15, 'a, b, c']
list element "20" will be removed

Answer 2

rows of 3

n = [int(i) for i in input().split()]
matrix = [n[i:i+3] for i in range(0,len(n),3)]