We call this the traditional method because this is what you will find in the examples included in the official numpy user guide and quickstart tutorials
The key to using the traditional method is to be sure to specify that you are using a function  or module from the numpy package by preceding it either with numpy or the abbreviation of your choice (such as np).  This is why the loadtxt command in this example above is written np.loadtxt instead of loadtxt.  
Here is another example: