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

title, tags

title	tags
sort_by_indexes	list,intermediate

Sorts one list based on another list containing the desired indexes.

• Use zip() and sorted() to combine and sort the two lists, based on the values of indexes.
• Use a list comprehension to get the first element of each pair from the result.
• Use the reverse parameter in sorted() to sort the dictionary in reverse order, based on the third argument.

def sort_by_indexes(lst, indexes, reverse = False):
  return [val for _, val in sorted(zip(indexes, lst), key = lambda x: x[0], reverse = reverse)]

a = ['eggs', 'bread', 'oranges', 'jam', 'apples', 'milk']
b = [3, 2, 6, 4, 1, 5]
sort_by_indexes(a, b) # ['apples', 'bread', 'eggs', 'jam', 'milk', 'oranges']
sort_by_indexes(a, b, True) # ['oranges', 'milk', 'jam', 'eggs', 'bread', 'apples']