loading data from a CSV file 

We are now going to use the Numerical Python (numpy) command loadtxt to load data from this  CSV text file.  Each column of data will become a Numerical Python (numpy) array.  
The process consists of two steps:
  1.  importing the loadtxt command from Numerical Python
  2. using the loadtxt command to transfer the data from the file

importing commands 

loadtxt is not part of the core Python language but is instead part of the Numerical Python package (numpy).  We must therefore "import" it into our program before using. There are two common methods of doing this. 
In the first method, each individual function  or module (such as loadtxt from numpy) is imported as needed . We call this the direct numpy import style