python - Print `numpy.ndarray` on a single line

Question

While using scipy/numpy, I do get information that I store into a numpy.ndarray

>>> a
array([[ 0.15555605,  0.51031528,  0.84580176,  0.06722675],
       [ 0.60556045,  0.62721023, -0.48979983, -0.04152777],
       [-0.78044785,  0.58837543, -0.21146041, -0.13568023],
       [ 0.        ,  0.        ,  0.        ,  1.        ]])
>>> print(a)
[[ 0.15555605  0.51031528  0.84580176  0.06722675]
 [ 0.60556045  0.62721023 -0.48979983 -0.04152777]
 [-0.78044785  0.58837543 -0.21146041 -0.13568023]
 [ 0.          0.          0.          1.        ]]

How can I print the result on a single line?

I already checked:

>>> numpy.get_printoptions()
{'precision': 8, 'threshold': 1000, 'edgeitems': 3, 'linewidth': 75, 'suppress': False, 'nanstr': 'nan', 'infstr': 'inf', 'formatter': None}

But even setting linewidth to 1000 does no change this. Is there a way to change the displayed format of that type?

Is it also possible to add comma in between each number (like the array display but without the surrounding array(...))?

Answer 1

In order to print a numpy.array into a single line, you can convert it to a list with its built-in function numpy.tolist()

Example:

import numpy as np

arr = np.array(((1, 2, 3), (4, 5, 6), (7, 8, 9)))

Simple print of array:

print(arr)
[[1, 2, 3]
 [4, 5, 6]
 [7, 8, 9]]

In comparison with numpy.tolist():

print(array.tolist())
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]