29 lines
934 B
Markdown
29 lines
934 B
Markdown
---
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title: Sort list by indexes
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type: snippet
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language: python
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tags: [list]
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cover: little-white-flowers
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dateModified: 2020-11-02T19:28:35+02:00
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---
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Sorts one list based on another list containing the desired indexes.
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- Use `zip()` and `sorted()` to combine and sort the two lists, based on the values of `indexes`.
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- Use a list comprehension to get the first element of each pair from the result.
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- Use the `reverse` parameter in `sorted()` to sort the dictionary in reverse order, based on the third argument.
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```py
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def sort_by_indexes(lst, indexes, reverse=False):
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return [val for (_, val) in sorted(zip(indexes, lst), key=lambda x: \
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x[0], reverse=reverse)]
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```
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```py
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a = ['eggs', 'bread', 'oranges', 'jam', 'apples', 'milk']
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b = [3, 2, 6, 4, 1, 5]
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sort_by_indexes(a, b) # ['apples', 'bread', 'eggs', 'jam', 'milk', 'oranges']
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sort_by_indexes(a, b, True)
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# ['oranges', 'milk', 'jam', 'eggs', 'bread', 'apples']
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```
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