How to have a filter support both MCEdit-Legacy and MCEdit-Unified

filter_thing_fast.py

# Thanks to TexelElf for this faster method of version independent editor grabbing code
def perform(level, box, options):
    global editor
    try:
        editor
    except:
        import inspect
        editor = inspect.stack()[1][0].f_locals.get('self', None).editor

filter_thing_slow.py

# This test filter has to have access to the editor instance
# NOTE: this filter will not work, it is just a guide for implementation

# Some where in your imports
import release

# My personal way of storing the data, you can change this to whatever
# way you like to use
class StoreData:
    def __init__(self):
        self._isFork = False
        self._editor = None
    @property
    def isFork(self):
        return self._isFork
    @property
    def editor(self):
        return self._editor
        
# Outside all functions
data = StoreData()

# In the perform function
ver = release.get_version()
if "unified" in ver.lower():
    try:
        data.editor = editor
        data.isFork = True
    except NameError:
        import inspect
        data.editor = inspect.stack()[1][0].f_locals.get('self', None).editor
        pass
else:
    import inspect
    data.editor = inspect.stack()[1][0].f_locals.get('self', None).editor