Sharing data between Operators

Question

I have two sets of Operators. The first set, lets call it A, produce data. The second set, lets call it B, needs to read this data. What possibilities do I have to store my data from set A, so it is accessable for the ones from B?

Additional info:

• The type of the data is a dictionary
• It is not neccessary to store it in the blender file to make it persistend for later use
• When Operators from A are called multiple times, the data shall be overwritten, so the Operarators from B always gets the latest data

Answer 1

A simple way is to use a global variable, although I don't recommend to make use of the global keyword on a dict directly. I suggest to use a class instead:

class G:
    pass

class OperatorA(...): ...
    G.your_dict = {"foo": "bar"}

class OperatorB(...): ...
    print(G.your_dict)

You may replace pass with class variable declarations if B might try to access it before A sets it:

class G:
    your_dict = {"default": None}

If the data is really related to let's say OperatorA, you may also use that class instead of G. Inside of a method in OperatorA, you can either refer to the class via the explicit name, or via self.__class__.

Answer 2

Another place you might store a dictionary is in the scene itself.

bpy.context.scene['mydataparams'] = {'value':1}
bpy.context.scene['mydataparams']['value']

It will get stored with the blender file. Whether that's a good thing or a bad thing is up to you.