It is possible, to do several items in YAML file with identical attributes, but with out need to actually duplicate them?
For example, I have:
item1:
it_one:
some: {...}
it_two:
somemore: {...}
item2:
the_same_as_in_item1
How can I specify, that item1 and item2 are have the same attributes? At the end I want to:
item1[it_one][some]
item2[it_one][some]
Give me identical result.
The mechanism in YAML that could help you out is using anchors and aliases. With those you have to watch out though, because when you alias a YAML mapping (loaded as a Python dict ), that you will get the same instance of that dict attached to item1 and item2.
If that is not what you want there is a specific interpretation of an alias in the form of a merge key. To use that specify a key <<:
item1: &repl
it_one:
some: {...}
it_two:
somemore: {...}
item2:
<<: *repl
this will give you, at least directly under item2 a new dict with the same keys/values as for item1 (i.e. keys it_one, it_two). However again the values for those keys (some: {}) will be the same object, due to the way this is loaded and handled internally.
If that kind of object reuse is problematic, you better stick with a non-merge use of the alias:
item1: &repl
it_one:
some: {...}
it_two:
somemore: {...}
item2: *repl
and walk over the tree recursively duplicating the key-values in new dicts (and lists).
Please note that if you use the round_trip_loader in ruamel.yaml, you will even share the everything, even when using merge keys. Without that round-tripping would not be possible, so use the safe_loader instead.
