[Python] Function like dict.get but returns value of default key instead of default value?

Let's say

a = {1:2, 3:4, 5:6}


Is there a builtin function (maybe something like a.get2(7,5)) that will return a[7], or a[5] if a[7] doesn't exist?

Such function can be defined easily as a.get(val, a.get(def_key)) but would prefer a builtin solution if exists.

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