On 10/14/2018 1:42 PM, Mats Wichmann wrote: > Hint here: don't use 'map' as your own variable name, since it's a > built-in function. Absolutely, I am always warning others about this gotcha. In this case map is local to add_to_map so it does not affect then global namespace. The reason I used it here was because the OP was using map (actually Map). Duh! Bob