Answers for "double list in python"

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)

double a value in a list python

def double_index(lst, index):
  for i in range(len(lst)):
    if index >= len(lst):
      return lst
    elif index == i:
      lst[i] = lst[i]**2
      return lst
    else:
      continue
    i += 1