[英]Reading 2d array from file in Python
The following code fills a 2d array (grid) with random numbers(0 or 1): 以下代码使用随机数(0或1)填充2d数组(网格):
def create_initial_grid(rows, cols):
grid = []
for row in range(rows):
grid_rows = []
for col in range(cols):
if random.randint(0, 7) == 0:
grid_rows += [1]
else:
grid_rows += [0]
grid += [grid_rows]
return grid
I want to fill the grid from a text file that looks like this: 我想从看起来像这样的文本文件中填充网格:
7
0,0,0,0,0,0,0
0,0,1,0,1,0,0
0,0,1,1,1,0,0
0,0,0,0,0,0,0
0,0,0,0,0,0,0
0,0,0,0,0,0,0
0,0,0,0,0,0,0
You can read the file, with: 您可以通过以下方式读取文件:
with open('myfile.txt') as f:
next(f) # skip the first line
data = [list(map(int, line.strip().split(','))) for line in f]
Here next(..)
will move the cursor to the next line, since the first here contains a 7
. next(..)
将光标移至下一行,因为此处的第一行包含7
。
If there is data after the lines, we might want to prevent reading that, and use: 如果这些行后面有数据,我们可能要防止读取该数据,并使用:
from itertools import islice
with open('myfile.txt') as f:
n = int(next(f)) # skip the first line
data = [list(map(int, line.strip().split(','))) for line in islice(f, n)]
For both file fragments here, the result is: 对于此处的两个文件片段,结果为:
>>> data
[[0, 0, 0, 0, 0, 0, 0],
[0, 0, 1, 0, 1, 0, 0],
[0, 0, 1, 1, 1, 0, 0],
[0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0]]
filesname = "t.txt"
with open(filesname) as f:
lines = f.read().split()
n = lines[0]
data_lines = lines[1:]
data = [map(int, row.split(",")) for row in data_lines]
print(data)
Hope this helps! 希望这可以帮助!
Other option is to use numpy.loadtxt to read .txt
(since you are use the array
and matrix
format): 另一个选择是使用numpy.loadtxt读取
.txt
(因为您使用的是array
和matrix
格式):
data = np.loadtxt("text.txt", delimiter=",",dtype=int , skiprows=1)
print(data)
Out:
出:
[[0 0 0 0 0 0 0] [0 0 1 0 1 0 0] [0 0 1 1 1 0 0] [0 0 0 0 0 0 0] [0 0 0 0 0 0 0] [0 0 0 0 0 0 0] [0 0 0 0 0 0 0]]
Note:
注意:
skiprows=1
# parameter for skipping the first line when reading from the file.skiprows=1
#用于从文件读取时跳过第一行的参数。
dtype=int
parameter for reading in theint
format (default isfloat
)dtype=int
参数,以int
格式读取(默认为float
)
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