Support for a `config_path` root key name

[actuallyaswin]

I saw the following comment in the SimpleParsing source code:

                # The file should have the same format as the command-line args, e.g. contain the
                # fields of the 'root' dataclass directly (e.g. "foo: 123"), rather a dict with
                # "config: foo: 123" where foo is a field of the root dataclass at dest 'config'.
                # Therefore, we add the prefix back here.

So it sounds like, if I was to use a config path in my main.py, e.g.:

@dataclass
class MyDataClass:
    a: int
    b: str

args = simple_parsing.parse(MyDataClass, config_path="config.yaml")

Then config.yaml would have to look like:

a: 12
b: test

Now say for example, due to some other external stipulation, I needed to have a root-level grouping in my config.yaml, e.g.:

parameters:
  a: 12
  b: test

Is there a feature that allows me to lookup that root key first before doing the parse? Something like:

args = simple_parsing.parse(
  MyDataClass, 
  config_path="config.yaml",
  config_root_key="parameters")

[lebrice]

Hello there @actuallyaswin , thanks for posting!

No there is no such feature at the moment. I'd recommend you subclass the ArgumentParser if you want to add that capability. ATM I don't think it's a feature I'd necessarily add as part of this library.