def changeColumn(ls):
""" Changes 2nd item in list to 2. Parameter ls is type list"""
ls[1] = 2
return ls
# generate your 2d list example
input_map = [ [ None for i in range(3) ] for j in range(3) ]
# should yield [[None, 2, None], [None, 2, None], [None, 2, None]]
map(changeColumn, input_map)
