2 dimensional list in python 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)]