Trying to create an empty grid

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class WorldMap (object):
def __init__ (self, width, height):
    self.width = width
    self.height = height
    world = []
    for i in range(self.width):
        world.append(None)
        for j in range(self.height): 
                                world[i].append(None)


class WorldMap(object):
def __init__(self, width, height):
    self.width = width
    self.height = height
    self.map = [[None for x in range(self.width)] for y in range(self.height)]
  1. The second successfully creates a grid. I don't understand why the first code doesn't work.
  2. to create an empty grid with lists, I tried using None and '' in the first code, but neither work. Why are both '' and None as used in the first code not correct ?

In your first code, the outer i loop:

world = []
for i in range(self.width):
    world.append(None)

creates a list of None:

world == [None, None, None, ...]

therefore in the inner j loop, when you call

world[i].append(None)

you are trying to call:

None.append(None)

and you can't append to None! The outer loop should have been:

world.append([]) # an empty list

Then the inner loop will work correctly with whatever (None, "", etc.) you want to put in those lists.

It is worth noting that the second version is much neater than the first, with (obviously!) less potential for error. However, a small improvement (as you never use x or y):

self.map = [[None for _ in range(width)] for _ in range(height)]

Styling Empty Cells With Generated Content And CSS Grid Layout , Ever wondered how achieve styling of empty grid cells without adding Understanding why it works and how to create one is useful and can help be the problem when trying to do this kind of thing with absolute positioning. The trick is to add an invisible square element (zero width and 100% bottom padding) to the grid, set equal height to all rows by grid-auto-rows: 1fr; and then reposition the invisible grid element

In your first code in the first loop you should be appending an empty list rather than None. Also the second version is way better.

Document Creation Guide for MicroStrategy 9. 3, For steps to add dataset reports to empty Grid/Graphs, see Adding a dataset toan emptyGrid/Graph. Empty Grid/Graphs can save time by allowing youto create a  Go to Edit mode by pressing F11 or using the drop-down menu in the top left and selecting Edit Grid. Select Grid Set, the blue tab at the top of the menu bar. Select New grid from the list on the left-hand side of the screen. Once selected, create your new grid by selected the number of rows and columns needed.

Let's assume the grid size will be:

size = 4

Now, we're making an empty grid:

grid = []

for y in range(size): grid = grid + [[]] for x in range(size): grid[y] = grid[y] + [0]

When you now call your grid you should get: [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]

Create an Empty Resource Grid - MATLAB & Simulink, This example shows how to create an empty resource grid of the right dimensions for the cell-wide settings specified in structure enb. widget.grid( grid_options ) Here is the list of possible options − column − The column to put widget in; default 0 (leftmost column). columnspan − How many columns widgetoccupies; default 1. ipadx, ipady −How many pixels to pad widget, horizontally and vertically, inside widget's borders.

What about this?

grid = [[0] * 20] * 20

3 Dimensional Empty Grid - MATLAB Answers, I'm trying to create a 3 dimensional grid that is empty with the dimensions of -.8 with an empty 3d grid, so I can make functions to draw things within the grid. I have a similar problem. My situation is that I bind my grid to an empty object on PageLoad (within the !IsPostBack section). I also create a datatable which would be created at runtime as the user would fill in the grid. This datatable has been assigned to be the datasource of the grid in the NeedDataSource event.

Adding new row with Empty Grid, Hi Team,. Try to create row with no data(Empty Data Grid)webdatagrid using javascript below. var grid = $find("gridname");. var row = new  If you use the grid manager instead, you only need one call per widget to get everything laid out properly (see next section for the code needed to create this layout). Warning: Never mix grid and pack in the same master window. Tkinter will happily spend the rest of your lifetime trying to negotiate a solution that both managers are happy with.

Grid 2.0 in Webflow, Create a grid with columns and rows, edit its layout, and make it responsive. Empty cells may remain in the grid when you have spanned grid children. The Grid geometry manager puts the widgets in a 2-dimensional table. The master widget is split into a number of rows and columns, and each “cell” in the resulting table can hold a widget. The grid manager is the most flexible of the geometry managers in Tkinter. If you don’t want to learn how and when to use all three managers, you

Grid Tutorial - Appian 20.2, In this tutorial, you will create a grid with selection in Design Mode (the best way) and Now, from the COMPONENTS palette, drag the READ-ONLY GRID component onto your blank interface. Try it out by selecting and deselecting rows. If the number of Rows are going to be fixed you could think of creating them within the EmptyDataTemplate of the GridView (this will make them show up without a DataSource). IF the requirements are going to expand, like dynamically increase empty rows etc, you'd rather have a DataSource (like a DataTable or generlic List) and work with one from the start. you could make an empty DataSource (set up the DataRows or properties with empty strings) and bind.

Comments
  • numpy.zeros(width*height).reshape((width,height)) is your best, fastest, and simplest way of doing it ... at least imho ... plus familiarizing yourself with numpy arrays early on will help you tons later
  • This will create 20 copies of the same list, such that changing grid[0] will also change grid[1], grid[2], etc. See stackoverflow.com/a/240205.