As shown here – thank you!
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Either creating or accessing a dictionary key.
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Adding to what @info.victoromondi already said…
There is a part of the code that’s missing here, this v is a dictionary that was created in some earlier part of the code…
something like v = {}
and it already has a couple of key : value pairs:
'data' Key
'columns' Key
then the code adds a new key : value pair in v["data_as_dicts"] = []
where the key is a string "data_as_dicts" and the value is an empty list that will be filled later in the loop that comes next by the .append() Method!
Hope this helps 
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Here is the whole sequence I’m trying to follow (the above pasted code is from the “Looping Techniques” section, a little past the middle on the page). I’m guess v is not defined at any point until then?
I tried entering the pasted code with everything I’ve followed on that page and it returns an error saying “v” is not defined.