30-seconds-of-code/snippets/map-values.md

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
Map dictionary values	dictionary	pineapple-laptop	2019-08-20T15:34:30+03:00	2020-11-02T19:28:27+02:00

Creates a dictionary with the same keys as the provided dictionary and values generated by running the provided function for each value.

• Use dict.items() to iterate over the dictionary, assigning the values produced by fn to each key of a new dictionary.

def map_values(obj, fn):
  return dict((k, fn(v)) for k, v in obj.items())

users = {
  'fred': { 'user': 'fred', 'age': 40 },
  'pebbles': { 'user': 'pebbles', 'age': 1 }
}
map_values(users, lambda u : u['age']) # {'fred': 40, 'pebbles': 1}