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Feature Request: Allow discovery of available config items #8524
Description
For my own package that uses the Astropy configuration machinery, I find myself needing to programmatically (re)discover all the config items in my package.conf without having to hardcode them one by one. Currently it is only possible as such, with is rather ugly:
from astropy.config import ConfigItem
from mypackage import conf
my_item_names = []
for key, val in conf.__class__.__dict__.items():
if isinstance(val, ConfigItem):
my_item_names.append(key)What would be nice (API negotiable):
from mypackage import conf
# This currently gives an error stating that conf is not iterable.
for configitem in conf:
do_something_with_configitem
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