I need a little bit of help to understand the lib

How to edit a value for specific thing like SpawnX and save that?

I added `sets` in the nbt.py:
```
def sets(self):
            self.children['SpawnX'] = IntTag(100000)
            return self.children['SpawnX']
```
I added the following code in main
```
test = level_data.get("Data").sets()
new = level_data.get("Data").get("SpawnX")
```

and it returns : `IntTag 'None' = 100000`
