refactor(3_merge_sort): Refactor merge_sort #11
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LesterKim
commented
Jul 18, 2020
Comment on lines
+12
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| def _merge(left: list, right: list) -> list: | ||
| merged_list = [] | ||
| left_index = right_index = 0 | ||
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| while left_index < len(left) and right_index < len(right): | ||
| if left[left_index] < right[right_index]: | ||
| merged_list.append(left[left_index]) | ||
| left_index += 1 | ||
| else: | ||
| merged_list.append(right[right_index]) | ||
| right_index += 1 | ||
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| for index, numbers in ((left_index, left), (right_index, right)): | ||
| while index < len(numbers): | ||
| merged_list.append(numbers[index]) | ||
| index += 1 | ||
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| return merged_list |
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Once students learn about Python classes, they can create a non-public class _ListMerger that contains this function as its public method.
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Refactor
merge_sortwith non-public_mergefunction; add typing and descriptive variable names. This includes a fix for returning alistiflen(num_list) < 2.