numpy save 2d array to text file

In [38]: x = np.arange(1,10).reshape(3,3)    

In [40]: print(np.array2string(x, separator=', '))
[[1, 2, 3],
 [4, 5, 6],
 [7, 8, 9]]

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To save the NumPy array x to a file:

np.set_printoptions(threshold=np.inf, linewidth=np.inf)  # turn off summarization, line-wrapping
with open(path, 'w') as f:
    f.write(np.array2string(x, separator=', '))

You can use the first format for copy-pasting as well:

>>> from io import BytesIO
>>> bio = BytesIO('''\
... 1, 2, 3
... 4, 5, 6
... 7, 8, 9
... ''') # copy pasted from above
>>> xs = np.loadtxt(bio, delimiter=', ')
>>> xs
array([[ 1.,  2.,  3.],
       [ 4.,  5.,  6.],
       [ 7.,  8.,  9.]])

import sys

file = "<you_file_dir>file.txt"

sys.stdout = open(file, 'w')

d = [1,2,3,4,5,6,7,8,9]
l__d1 = d[0:3]
l__d2 = d[3:6]
l__d3 = d[6:9]

print str(l__d1) + '\n' + str(l__d2) + '\n' + str(l__d3)