On 2017-09-15 17:45, Terry Reedy wrote: > On 9/15/2017 3:36 PM, Tim Chase wrote: > > d = { > > "a": 0, > > "a": 1, > > "a": 2, > > } > > > > In my limited testing, it appears to always take the last one, > > resulting in > > > > {"a": 2} > > > > Is this guaranteed by the language spec > > https://docs.python.org/3/reference/expressions.html#dictionary-displays > If a comma-separated sequence of key/datum pairs is given, they are > evaluated from left to right to define the entries of the > dictionary: each key object is used as a key into the dictionary to > store the corresponding datum. This means that you can specify the > same key multiple times in the key/datum list, and the final > dictionary’s value for that key will be the last one given.
Ah, I'd checked the "Data Structures" and "Built-in types" pages, but missed the "expressions" page. At least that means that the botched data in our system is at least *consistently* botched which eases my work a bit. Many thanks, -tkc -- https://mail.python.org/mailman/listinfo/python-list