The original link: http://www.juzicode.com/archives/2225
Error message:
Use the numpy.eye() function times NameError: the name ‘numpy’ is not defined

D:\juzicode>python mod.py
 Traceback (most recent call last):
   File "mod.py", line 3, in 
     n = numpy.eye(4)
 NameError: name 'numpy' is not defined

Possible reasons:
1. Did not import numPY module, but used the functions in numPY module.

Solutions:
1. Import the module NUMpy before calling the function of numpy: