How can I reshape a 2D array into 1D in python?

Question

Let me edit my question again. I know how flatten works but I am looking if it possible to remove the inside braces and just simple two outside braces just like in MATLAB and maintain the same shape of (3,4). here it is arrays inside array, and I want to have just one array so I can plot it easily also get the same results is it is in Matlab. For example I have the following matrix (which is arrays inside array):

s=np.arange(12).reshape(3,4)
print(s)
[[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]]

Is it possible to reshape or flatten() it and get results like this:

[ 0  1  2  3
  4  5  6  7
  8  9 10 11]

Answer 1

Try .ravel():

s = np.arange(12).reshape(3, 4)
print(s.ravel())

Prints:

[ 0  1  2  3  4  5  6  7  8  9 10 11]

Answer 2

Simply, using reshape function with -1 as shape should do:

print(s)
print(s.reshape(-1))

[[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]]
[ 0  1  2  3  4  5  6  7  8  9 10 11]