30-seconds-of-code/snippets/python/s/map-dictionary.md

title, type, language, tags, excerpt, cover, dateModified

title	type	language	tags	excerpt	cover	dateModified
Map list to dictionary	snippet	python	list dictionary	Maps the values of a list to a dictionary using a function.	colors-mural	2020-11-02T19:28:27+02:00

Maps the values of a list to a dictionary using a function, where the key-value pairs consist of the original value as the key and the result of the function as the value.

• Use map() to apply fn to each value of the list.
• Use zip() to pair original values to the values produced by fn.
• Use dict() to return an appropriate dictionary.

def map_dictionary(itr, fn):
  return dict(zip(itr, map(fn, itr)))

map_dictionary([1, 2, 3], lambda x: x * x) # { 1: 1, 2: 4, 3: 9 }