2d lists code example

Example 1: how to create 2d list in python

o=[]
for i in range(0,rows):
    x=[]
    for j in range(0,cols):
        x.append(0)
    o.append(x)
#if you use [[0]*cols]*rows all rows will become the same list
#so editing in one row will edit all rows

Example 2: create a 2d array in python

def build_matrix(rows, cols):
    matrix = []

    for r in range(0, rows):
        matrix.append([0 for c in range(0, cols)])

    return matrix

if __name__ == '__main__':
    build_matrix(6, 10)

Example 3: 2d array python3

# 5x6, 2-d array of booleans using list comprehension:

matrix = [[False for col in range(6)] for row in range(5)]

# 6x5, 2-d array of banana's using list comprehension:

matrix = [['banana' for col in range(5)] for row in range(6)]

Example 4: We pass in a 2 dimensional list. You should output the 3rd element of the 2nd row.

In a 2 dimensional list, output the 3rd element of the 2nd row.
# remember to account for 0 index
print(variable[1][2])