How to use variables in other .py files

Question

I have file A.py in a package with a class and a list as class attribute or class variable. File A run a loop to update value to that list. How can I get the list and all changes to file B.py (in another package).

Answer 1

When using only 'class attributes', the values are static, a simple 'import' should work.

For example, proj/package1/A.py:

class A:
    attr1 = "foo"
    attr2 = "bar"

Create file __init__.py in all directories: current, package1, package2

Import A from proj dir in proj/B.py:

from package1.A import *
print(A.attr1)
print(A.attr2)

Import A from non-parent dir, eg. proj/package2/B.py

import sys
sys.path.append("package1") # Run programme in `proj` dir

from A import *
print(A.attr1)
print(A.attr2)