[英]How to create a 2D array in python forming a diamond?
How can I create a 2d array in python without using any libraries (no numpy or dataframes)?如何在不使用任何库(没有 numpy 或数据帧)的情况下在 python 中创建二维数组? That is, only using vanilla python.
也就是说,仅使用香草 python。
It must result in an by n full diamond, where even-shaped diamonds are two hashes wide and odd-sized diamonds are one hash wide at their points, for example:它必须产生一个由 n 个完整的菱形,其中偶数形状的菱形是两个散列宽,奇数大小的菱形在它们的点上是一个 hash 宽,例如:
diamond(5) returns
[[' ', ' ', '#', ' ', ' '],
[' ', '#', '#', '#', ' '],
['#', '#', '#', '#', '#'],
[' ', '#', '#', '#', ' '],
[' ', ' ', '#', ' ', ' ']]
diamond(6) returns
[[' ', ' ', '#', '#', ' ', ' '],
[' ', '#', '#', '#', '#', ' '],
['#', '#', '#', '#', '#', '#'],
['#', '#', '#', '#', '#', '#'],
[' ', '#', '#', '#', '#', ' '],
[' ', ' ', '#', '#', ' ', ' ']]
So far, the best I could come up with was:到目前为止,我能想到的最好的方法是:
HASH = "#"
SPACE = " "
def diamond(n):
if n % 2 == 0:
return [
[HASH if (i+1 == n//2) or (i == n//2) or (j == n//2) or (j+1 == n//2)
or (i > 0 and j>0 and i!=j and (i%j ==0 or j%i ==0))
else SPACE for i in range(n)
]
for j in range(n)
]
return [
[HASH if (i == n//2) or (j == n//2)
or (i > 0 and j>0 and (i%j ==0 or j%i ==0))
else SPACE for i in range(n)
] for j in range(n)
]
but it does not work well yet.但它还不能很好地工作。
I also have seen this answer: 2d array diamond shape of 1's of size x .我也看到了这个答案: 2d array diamond shape of 1's of size x 。 But it does use numpy.
但它确实使用了 numpy。
You could do it like this:你可以这样做:
def diamond(n):
if n% 2:
result = [[' ']*i+['#']*(n-(2*i))+[' ']*i for i in range(n//2, -1,-1)]
return result + result[:-1][::-1]
result = [[' ']*i+['#']*(n-(2*i))+[' ']*i for i in range(n//2-1, -1, -1)]
return result + result[::-1]
diamond(5)
: diamond(5)
:
[[' ', ' ', '#', ' ', ' '],
[' ', '#', '#', '#', ' '],
['#', '#', '#', '#', '#'],
[' ', '#', '#', '#', ' '],
[' ', ' ', '#', ' ', ' ']]
diamond(6)
: diamond(6)
:
[[' ', ' ', '#', '#', ' ', ' '],
[' ', '#', '#', '#', '#', ' '],
['#', '#', '#', '#', '#', '#'],
['#', '#', '#', '#', '#', '#'],
[' ', '#', '#', '#', '#', ' '],
[' ', ' ', '#', '#', ' ', ' ']]
try this, you start by adding the middle full line and reduce 1 column every time you step down a row until you reach the bottom (n//2), then you flip the list and add it to the original list, creating the full diamond试试这个,你首先添加中间的整行,每次你下一行直到到达底部(n//2)时减少一列,然后你翻转列表并将其添加到原始列表中,创建完整的钻石
def diamond(n):
# define the full line in the middle
hash_line = ["#"]*n
# this will hold the diamond shape
d_list = []
# start by adding the hash_line
d_list.append(hash_line)
# add one half of the diamond, reducing one column each time you step down
for i in range(n//2):
line = hash_line.copy()
line[:i+1] = [' ']*(i+1)
line[-1*(i+1):] = [' ']*(i+1)
d_list.append(line)
# now you have the bottom half of the diamond
# if n is even flip d_list and add it in the beginning of the original d_list
if n%2 == 0:
final = d_list[::-1]+d_list
return final[1:-1]
# if n is odd flip d_list without the hash_line which is held in the first index
return d_list[1:][::-1]+d_list
d = diamond(5)
print(d)
d = diamond(6)
print(d)
After realising that a diamond simply is a ball wrt.在意识到钻石只是一个球之后。 L1 metric you can put '#' when distance from the centre is half of the size of the array, ie |x-center_x|
当距中心的距离是数组大小的一半时,您可以使用 L1 度量,即 |x-center_x| + |y-center_y|
+ |y-中心_y| < half_screen which gives a one liner solution
< half_screen 提供单层解决方案
def diamond(n):
return [['#' if (abs(i-(n+1)/2) + abs(j- (n+1)/2)) < (n+1)/2 else ' '
for i in range(1, n+1)] for j in range(1, n+1)]
and then接着
print('\n'.join(map(str,diamond(5))))
[' ', ' ', '#', ' ', ' ']
[' ', '#', '#', '#', ' ']
['#', '#', '#', '#', '#']
[' ', '#', '#', '#', ' ']
[' ', ' ', '#', ' ', ' ']
print('\n'.join(map(str,diamond(6))))
[' ', ' ', '#', '#', ' ', ' ']
[' ', '#', '#', '#', '#', ' ']
['#', '#', '#', '#', '#', '#']
['#', '#', '#', '#', '#', '#']
[' ', '#', '#', '#', '#', ' ']
[' ', ' ', '#', '#', ' ', ' ']
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