[Tutor] Accessing variables from other modules

[Steven D'Aprano]

Hi Chip, and welcome!

On Tue, Sep 04, 2018 at 11:10:36AM -0400, Chip Wachob wrote:

> I'll refrain from posting a bunch of code, but here is the 5000 foot view:

Not posting a mountain of code is a great idea, but from 5000 ft away 
we can't see what is going on.

Try posting *a little bit of code*. This is written for Java programmers 
but the principle is the same for Python:

http://sscce.org/

If I had to make a *wild guess* as to what is going on, it would be that 
you have a couple of modules like this:

# Module spam.py
x = 1  # global variable
def foo():
    print(x)


# Module eggs.py
import spam
from spam import x
foo()  # prints 1, as you expect
x = 999
foo()  # still prints 1, instead of 999


Is that what is going on? On something different?


A few more comments:

> execution looks like this:
> 
> $ sudo python main.py

Do you really need this to be run with root permissions?

> So, the important questions are:
> 
> - Was I mislead by the fact that there was a power cycle on the
> machine and it has now forgotten something that was staying resident
> when I tested the code on Friday?  Or, does each 'run' of the script
> start fresh?

Um, yes no maybe?

Was there a power cycle? How were you running the scripts?


> - What approach do I need to use to be able to initialize the
> interface in spi.py and have it be something that is accessible to all
> the other modules in my project?




> 
> Thank you in advance for your time.
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