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Creating a V-shaped pattern with Python

I want to make a template by algorithm.

The result is a pattern like

..........
..........
..........
..........
..........
..........
.########.
.########.
##########
##########

But my ideal pattern

##......##
##......##
.##....##.
.##....##.
..##..##..
..##..##..
...####...
...####...
....##....
....##....

So, I don't understand why I can't do this in my code. Comparing the current template and the ideal one, I think that the data cannot be used correctly. But I don't know how to fix it. What should I do to do this?

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5 answers


Another approach:

final = []
for i in range(10):
    temp = ["." for j in range(10)]
    temp[int(i / 2)] = "#"
    temp[int(i / 2) + 1] = "#"
    temp[-int(i / 2) - 1] = "#"
    temp[-int(i / 2) -2] = "#"
    final.append(temp)

for a in final:
    print("".join(a))

This will print:



##......##
##......##
.##....##.
.##....##.
..##..##..
..##..##..
...####...
...####...
....##....
....##....

It can be made even cleaner, but you can see all the different steps here, so I hope this helps

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# 10x10
#             first # start position  second # start position from last
# LN 0 1:     0                       -1
# LN 2 3:     1                       -2
# LN 2k 2k+1: k                       -k-1
# LN 8 9:     4                       -5

# dw: dot '.' width
# sw: sharp '#' width
# if k == 0 part is ugly, for list slicing
def draw(dw, sw):
    for k in range(dw//2):
        row = [ '.' for _ in range(dw) ]
        row[k:k+sw] = '#' * sw
        if k == 0:
            row[-sw:] = '#' * sw
        else:
            row[-k-sw:-k] = '#' * sw
        print("".join(row))
        print("".join(row))

draw(10, 2)

since draw(20, 2)

received



##................##
##................##
.##..............##.
.##..............##.
..##............##..
..##............##..
...##..........##...
...##..........##...
....##........##....
....##........##....
.....##......##.....
.....##......##.....
......##....##......
......##....##......
.......##..##.......
.......##..##.......
........####........
........####........
.........##.........
.........##.........
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I would use the itertools product and filter out the indices that don't matter

def v(row):
    return set([int(row/4), row-int(row/4), int(row/4)+1, row-int(row/4)-1])

from itertools import product
indices = product(range(len(array)),range(len(array[0])))
indices = filter(lambda i: i[1] in v(i[0]), indicies)
for r,c in indices:
    array[r][c] = "#"
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Don't know what you are trying to do here, but I can do it too:

a = "##..."
for i in range(10):
    b = ("."*int(i/2) + a)[:5]
    print(b + b[::-1])
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A little more concise:

width = 10

for i in range(width):
    line = ['.'] * width
    m = i//2
    line[m] = line[m+1] = line[-m-1] = line[-m-2] = "#"
    print(''.join(line))
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