import numpy as np

a = np.array([1, 2, 3])  # Create a rank 1 array

print (type(a))            # Prints "<type 'numpy.ndarray'>"
print (a.shape)           # Prints "(3,)"
print (a[0], a[1], a[2])   # Prints "1 2 3"
a[0] = 5                 # Change an element of the array
print (a)                  # Prints "[5, 2, 3]"

b = np.array([[1,2,3],[4,5,6]])   # Create a rank 2 array
print (b.shape)                     # Prints "(2, 3)"
print (b[0, 0], b[0, 1], b[1, 0])   # Prints "1 2 4"

# test comment

<class 'numpy.ndarray'>
(3,)
1 2 3
[5 2 3]
(2, 3)
1 2 4