Default value for a regular config key

[dagap]

WIth hydra, I can do something as follows:

user: ${oc.env:DB_USER, null}

This gives me the user specified in the environment variable or null if not found. However, I am unable to do with regular variables like:

quantile: ${quantile, 0.5}

Is something like this achievable?

[omry]

Check the OmegaConf select resolver documented here.

cfg = OmegaConf.create({
 "a": "Saving output to ${oc.select:output,/tmp}"
})
print(cfg.a)
# Saving output to /tmp
cfg.output = "/etc/config"
print(cfg.a)
# Saving output to /etc/config