Access to one variable in multiple files in Python?

Question

I have a package containing many .py files.

I want to:

have a debug flag, which I can access in each file. (Actually write it in one file, read it in all other files)
have a version number in each file, which is individual for each file. But I would like to create one function to get all version numbers of all files.

How do I define variables in these cases? How do I use import?

Edit: I use an empty __init__.py file and:

in package/classes.py:

debug = False

in package/db.py:

from package.classes import *

print debug

Same way you'd import any thing else in Python.. functions are just variables in a module after all. Did you read the Python tutorial? (or use the Python 2.4 version of the tutorial). — Martijn Pieters
– Martijn Pieters, Commented Oct 22, 2012 at 13:44
is the init file inside the package folder? in db you should type from classes import *, since you're already in the same module. see docs.python.org/tutorial/modules.html#intra-package-references — Samuele Mattiuzzo
– Samuele Mattiuzzo, Commented Oct 22, 2012 at 15:23

Samuele Mattiuzzo · Accepted Answer · 2012-10-22 15:26:27Z

2

Suppose you have a variable named FLAG in your files/variables.py file.

If the files folder has an empty __init__.py file inside, you just need to do

from files.variables import *

and you can access it in every file you import it.

To go with your example:

folder structure:

\program\ 
         \package\
                  __init__.py
                  classes.py
                  db.py

in db.py

from .classes import *
print debug

should work

About the versioning, if you want to do it manually i think you have to do the same, but it's a hassle to mantain by hand the versions.

edited Oct 22, 2012 at 15:26

answered Oct 22, 2012 at 13:45

Samuele Mattiuzzo

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4 Comments

user1765274 Over a year ago

I tried: # in package/classes.py: debug = True # in init.py: from package.classes import * from package/db import * # in package/db.py: print debug What is wrong?

Samuele Mattiuzzo Over a year ago

leave the init file empty, and eventually update the main post, not a comment, or it will be harder for us. the import statement should inside every file that's using it, not in the init actually

user1765274 Over a year ago

".classes" does not work. and it does not know debug in the db.py if I use "package.classes" either. :( I just hate importing logics...

Samuele Mattiuzzo Over a year ago

i see just now you're using python2.4, so maybe the '.classes' isn't working because of that. maybe there's something else lying around you're not telling us? like this, everything should work smoothly

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