Loop over Numpy array

If you're dealing with a 1D Numpy array, looping over all elements can be as simple as:

for x in my_array :
    ...

If you're dealing with a 2D Numpy array, it's more complicated. A 2D array is built up of multiple 1D arrays. To explicitly iterate over all separate elements of a multi-dimensional array, you'll need this syntax:

一列一列的print出来

for x in np.nditer(my_array) :
    ...