When sorting by a MultiIndex you need to contain the tuple describing the column inside a list*: In [11]: df.sort_values([(‘Group1’, ‘C’)], ascending=False) Out[11]: Group1 Group2 A B C A B C 2 5 6 9 1 0 0 1 1 0 3 2 5 7 3 7 0 2 0 3 5 * so as … Read more
Python uses an algorithm called Timsort: Timsort is a hybrid sorting algorithm, derived from merge sort and insertion sort, designed to perform well on many kinds of real-world data. It was invented by Tim Peters in 2002 for use in the Python programming language. The algorithm finds subsets of the data that are already ordered, … Read more
One option would be the following: Using a linear-time selection algorithm like median-of-medians or introsort, find the kth largest element and rearrange the elements so that all elements from the kth element forward are greater than the kth element. Sort all elements from the kth forward using a fast sorting algorithm like heapsort or quicksort. … Read more
try to use key with sorted: sorted(_list2,key=_list1.index) for nested list you can use list comphresnion: [sorted(x,key=_lis1.index) for x in _list2]
Your first link more or less solves the problem. You just need to have the lambda function only look at the first item in your list: alphabet = “zyxwvutsrqpomnlkjihgfedcba” new_list = sorted(inputList, key=lambda word: [alphabet.index(c) for c in word[0]]) One modification I might suggest, if you’re sorting a reasonably large list, is to change the … Read more
To answer the question of “Why does Hoare partitioning work?”: Let’s simplify the values in the array to just three kinds: L values (those less than the pivot value), E values (those equal to the pivot value), and G value (those larger than the pivot value). We’ll also give a special name to one location … Read more
LIKE is not fulltext search. In Fulltext search, MATCH(…) AGAINST(…) returns a matching score that can be roughly approximated as relevancy.
iso_dif/2 is much simpler to implement than a comparison: The built-in \= operator is available You now exactly what arguments to provide to\= Definition Based on your comments, the safe comparison means that the order won’t change if variables in both subterms are instanciated. If we name the comparison lt, we have for example: lt(a(X), … Read more
bisect is part of the standard library – is that the sort of thing you’re looking for?
It’s a correct but odd and inefficient insertion sort. Let’s first visualize it by printing A after each complete inner loop iteration. Example: before: [1, 12, 13, 8, 15, 18, 19, 16, 7, 11, 6, 14, 3, 2, 9, 5, 4, 0, 10, 17] [19, 1, 12, 8, 13, 15, 18, 16, 7, 11, 6, … Read more