How to change all values in this nested list?

Question

The function gboard is suppose to return a nested list in column major order. I have gotten it to do this, but I am not sure of how to set each value in the list equal to 0 (or the variable I set equal to 0 in another function called constants.dead.) If anyone has any idea of how I could do this I would appreciate the help.

def gboard(height, width):
    """ Returns: Nested list in column-major order representing a game board.  All the cells in the board are in the set to 0.

    Parameter height: number of rows in the board
    Parameter width: number of columns in the board
    Precondition: height and width are positive ints
    """
    list = []
    for y in range(width):
        list.append([])
        for x in range(height):
            list[y].append(x)
    return list

The output of the function for example is this:

>>> gboard(4,3)
[[0, 1, 2, 3], [0, 1, 2, 3], [0, 1, 2, 3]]

But I would rather it be:

>>> gboard(4,3)
[[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]

my suggestion: board = [width*[0] for _ in range(height)], and please do nut use list as variable name... — hiro protagonist
– hiro protagonist, Commented Jul 22, 2020 at 19:31
ah okay i wont use list but i am still confused as to what board is for you and where you get 19 from. — user13960461
– user13960461, Commented Jul 22, 2020 at 19:34
that would be the return value of your function... return board, ...added as an answer. — hiro protagonist
– hiro protagonist, Commented Jul 22, 2020 at 19:35

hiro protagonist · Accepted Answer · 2020-07-22 19:55:15Z

1

i suggest you use a list-comprehesion:

def gboard(height, width):
     return [height*[0] for _ in range(width)]

that would produce

gboard(4, 3) 
# [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]

edited Jul 22, 2020 at 19:55

answered Jul 22, 2020 at 19:38

hiro protagonist

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Comments

klv0000 · Accepted Answer · 2020-07-22 19:45:20Z

0

change list[y].append(x) to list[y].append(0)

strange it didn't worked for you. apparently this code worked for me:

def gboard(height, width):
    """ Returns: Nested list in column-major order representing a game board.  All the cells in the board are in the set to 0.

    Parameter height: number of rows in the board
    Parameter width: number of columns in the board
    Precondition: height and width are positive ints
    """
    list = []
    for y in range(width):
        list.append([])
        for x in range(height):
            list[y].append(0)
    return list
  
print(gboard(4, 3))

output:

[[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]

edited Jul 22, 2020 at 19:45

answered Jul 22, 2020 at 19:35

klv0000

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1 Comment

user13960461 Over a year ago

Thanks but I tried this and it does not work I get a Type Error: TypeError: append() takes exactly one argument (0 given) And this happens if i put anything within those parentheses besides x. (any int value)

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