CODEWITHSUNDEEP
pythonpython-3.xmodule
azrael
azrael

Reputation: 120

Changed Variable in another module won't update

I'm trying to have a changed variable affect another module. That other module doesn't seem to notice the change.

a.py: 

import b

b.changeMyVar()
print(b.myVar["key"])

b.py:

myVar = {"key": "foo"}

def changeMyVar():
    myVar["key"] = "value"

What I expect (on running a.py):

value

What I get: 

foo

How do I make this work? Why doesn't it work? Would things be different if myVar was a dictionary that is mutated by changeMyVar (both situations occur in my program)?

Note how I didn't write from b import *, which is evil as I understand.

Edit 1: As commenters pointed out, if myVar was an immutable object, this wouldn't work without global myVar. I changed the example to better reflect what I mean.

Edit 2: I forgot to add b. However, my question remains unchanged. The variables is defined but runtime changes are not visible from the other module. I have again edited the code to clarify my problem.

Upvotes: 1

Views: 1288

Answers (1)

r0the
r0the

Reputation: 612

import b does't import myVar or changeMyVar to the scope of a.py, it only defines the name b referring to the module.

So you have to use the name b to access myVar and changeMyVar() in a.py:

import b

b.changeMyVar()
print(b.myVar["key"])

Upvotes: 2

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