Jul 3, 2013 · That's because the whole point of a set, both in mathematics and in almost every programming language,* is that it's not ordered: the sets {1, 2} and {2, 1} are the same set. You probably don't really want to sort those elements as strings, but as numbers (so 4.918560000 will come before 10.277200999 rather than after).

Nov 12, 2019 · You can used sorted(set(var1).difference(var2)) to turn the set into a sorted list, but you cannot sort the set itself (sets are, by definition, unordered). – chepner Commented Nov 12, 2019 at 14:43

Mar 28, 2019 · Just read python documentation: Python also includes a data type for sets. A set is an unordered collection with no duplicate elements. Basic uses include membership testing and eliminating duplicate entries. Set objects also support mathematical operations like union, intersection, difference, and symmetric difference. Emphasis mine.

Generic answer to sort any numbers in any position in an array of strings. Works with Python 2 & 3. def alphaNumOrder(string): """ Returns all numbers on 5 digits to let sort the string with numeric order.

Feb 5, 2018 · List.sort() established the convention that sort() sorts the object in place, but a set cannot be sorted in place because sets are unordered. A set could conceivably have a method with another name that returned a sorted list of its elements. But there is no need for such a method because the function sorted() already does that job.

Please note: If you work with Python 3, then str is the correct data type for every string that contains human-readable text. However, if you still need to work with Python 2, then you might deal with unicode strings which have the data type unicode in Python 2, and not str.

Aug 30, 2011 · The key argument of sort allows custom sort keys. Using len will do the trick:. l=<list_of_sets> l.sort(key=len) If you want the longest set first, use the reverse argument:

Oct 31, 2009 · An ordered set is functionally a special case of an ordered dictionary. The keys of a dictionary are unique. Thus, if one disregards the values in an ordered dictionary (e.g. by assigning them None), then one has essentially an ordered set. As of Python 3.1 and 2.7 there is collections.OrderedDict. The following is an example implementation of ...

Feb 27, 2023 · The second sort accesses each object only once to extract its count value, and then it performs a simple numerical sort which is highly optimized. A more fair comparison would be longList2.sort(cmp = cmp). I tried this out and it performed nearly the same as .sort(). (Also: note that the "cmp" sort parameter was removed in Python 3.) –

In Python 3, dictionaries will retain insertion order; for older versions, use collections.OrderedDict. The dict will have values besides the keys, but you can just ignore those. The dict will have values besides the keys, but you can just ignore those.