Datatypes in Numpy

import numpy as np

x = np.array([101, 202])  
print(x.dtype)        

x = np.array([11.75, 21.75]) 
print(x.dtype)            

x = np.array([1, 2], dtype=np.int64) 
print(x.dtype)                    

x = np.array([1, 2], dtype=np.complex128) 
print(x.dtype) 

2D-array representation using with & without numpy implementation

import numpy as np

a = np.array([[1,2,3,4], [5,6,7,8], [9,10,11,12]])
print ("Using Numpy\n",a)

b=[[1,2,3,4], [5,6,7,8], [9,10,11,12]]
print ("Without Numpy\n", b)