testing code

[Sharan Basappa]

On Friday, 6 July 2018 09:22:31 UTC+5:30, Chris Angelico  wrote:
> On Fri, Jul 6, 2018 at 12:56 PM, Sharan Basappa
> <sharan.basappa at gmail.com> wrote:
> > Please let me know if the following understanding of mine is correct.
> > I need to put the program code in a separate file and organize every executable code in some form of function. If any code exists outside of function then it is not executable by importing.
> >
> 
> Kinda. It's actually the other way around: if any code exists outside
> of functions, it will be executed immediately when you import. So
> you're correct in that it would be hard (maybe impossible) to
> unit-test that; and yes, the normal way to do it is to put all your
> important code into functions.
> 
> ChrisA

Chris,

Things do work as per expected with one exception.
You mentioned that as soon as a file is imported, it executes immediately.

Please see the example below:

file: test_2.py

x = 10
y = 20

c = x-y

print c

def func1():
    return x+y  

test_2_test.py

x = 10
y = 20

c = x-y

print c

def func1():
    return x+y  

this is the output:
%run "D:/Projects/Initiatives/machine learning/programs/test_2_test.py"
30

As you can see, print c in test_2 file was not executed upon import as there is no corresponding output