[Python-ideas] Add dict.append and dict.extend

[Chris Barker - NOAA Federal]

> d.setdefault(key, value)

I though the OP wanted an error if the key already existed.

This is close, as it won’t change the dict if the key is already
there, but it will add it if it’s not.

@OP

Maybe post those five lines so we know exactly what you want — maybe
there is already a good solution. I know I spent years thinking “there
should be an easy way to do this” before I found setdefault().

-CHB

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