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snippets/python/s/sort-by-indexes.md

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+---
+title: Sort list by indexes
+type: snippet
+language: python
+tags: [list]
+cover: little-white-flowers
+dateModified: 2020-11-02T19:28:35+02:00
+---
+
+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.
+
+```py
+def sort_by_indexes(lst, indexes, reverse=False):
+  return [val for (_, val) in sorted(zip(indexes, lst), key=lambda x: \
+          x[0], reverse=reverse)]
+```
+
+```py
+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']
+```