Why is there difference between cmd line and .py file?

[Steven D'Aprano]

On Wednesday 06 January 2016 07:25, Robert wrote:

> Why is there difference between cmd line and .py file?

Almost certainly because you are not running exactly the same code each 
time.


> I run below code, which is downloaded from link:

Your code fails on the first line with 

    NameError: name 'np' is not defined


so you are obviously running something different from what you post here. 
Since we don't know what code you are actually running, we cannot tell you 
why it behaves differently when run as a .py file and in the interactive 
interpreter.

But I am 99% sure that it is because you are running slightly different 
pieces of code.

My *guess* is that in the code that works correctly, you are running:

import numpy as np
from numpy import sum

at the beginning of the .py script, but in the interactive shell, you are 
just running:

import numpy as np


But there may be other differences as well.



-- 
Steve