30-seconds-of-code/snippets/map_values.md

title, tags

title	tags
map_values	dictionary,function,intermediate

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

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

def map_values(obj, fn):
  ret = {}
  for key in obj.keys():
    ret[key] = fn(obj[key])
  return ret

users = {
  'fred': { 'user': 'fred', 'age': 40 },
  'pebbles': { 'user': 'pebbles', 'age': 1 }
}

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