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dagster

<@U02P1FEE1AR> Given it’s a yaml file, I don’t think yaml properly supports string concatenation, weirdly enough, but I’ve found that defining a root path in a resource and then using a python `Path` object works pretty well

e.g.

```# config.yaml
resources:
  storage:
    config:
      local: data/dag```
and in my pipeline code:
```cached_path = Path(context.resources.storage['local']) / 'cache' / 'cached_raw.snappy.parquet'```

This also plays nicely when switching between environments (local resources vs cloud), though I’m just starting to explore using the `io_manager` a little more intelligently, so there are probably better ways :slightly_smiling_face:

Seems a nice solution but unfortunately i want to use the var i define in the Yaml inside the same yaml not from the python code

But I have the case of Path, but i have i also have the case of dates which i'm repeating a lot of times in my yaml, and if i could foung a solution to variabilize the date it would be much better

From actually this
```ops:
   purify:
      command_param:
'inputpath=/home/datawork/ 20200101'
   partition:
      command_param: 'inputpath=/home/datawork/inputpath=/home/datawork/ 20200101'
     ```
to something like that
```date: 20200101
ops:
   purify:
      command_param: 'inputpath=/home/datawork/ *date*'
   partition:
      command_param: 'inputpath=/home/datawork/inputpath=/home/datawork/ *date*'```