CODE EXAMPLE FOR PYTHON

length of a NumPy array in Python

a = np.arange(3)
b = np.arange(12).reshape((3, 4))
c = np.arange(24).reshape((2, 3, 4))

# it returns the size of the first dimension (=np.shape[0])
print(len(a)) # 3
print(len(b)) # 3
print(len(c)) # 2