editops's result do not match the ratio's result

[brealisty]

str1 = 'AB1010'
str2 = '1010AB'
ratio' result --> 0.6666, that means there are 4 steps（2 delete, 2 insert）,(12-4)/12;
editops' result --> [('replace', 0, 0), ('replace', 1, 1), ('replace', 4, 4), ('replace', 5, 5)],
obviously, this anwser not match (12-4)/12, instead of (12-8)/12.

some differences in those two function about the edit distance?

[BobLd]

Not sure, but could be linked to an issue in the editops_from_cost_matrix function. Check a possible solution here: #16 (comment)

[maxbachmann]

Editops uses the normal uniform Levenshtein distance, while ratio uses the InDel Distance (no Substitutions). In this specific implementation this is achived by giving substitutions a weight of 2 which is similar to a Insertion + a Deletion.