How to use python to output all permutations of list elements
This article introduces the knowledge of "how to use python to output all the arrangement forms of list elements". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!
['axiao,' baked,'c'] output ['await,' baked,'c'] ['baked,' baked,'b'] ['baked,' clocked,'a'] ['cased,' clocked,'b'] ['cased,' baked,'a']
Method 1: use recursive method to realize
Def permutation (li): len_list = len (li) if len_list = = 1: return li result = [] for i in range (len_list): res_list = li [: I] + li [iTun1:] s = li [I] per_result = permutation (res_list) if len (per_result) = 1: result.append (Li [I: iTun1] + per_result) else: result + = [[s] + j for j in per_result] return result
Method 2: use the module that comes with python
Import itertools def permutation (li): print (list (itertools.permutations (li)
Supplementary expansion: python realizes the full arrangement of four numbers
First of all, we use the general practice to complete the loop exchange.
Lst = [1,3,5,8] for i in range (0, len (lst)): lst [I], lst [0] = lst [0], lst [I] for j in range (1, len (lst)): lst [j], lst [1] = lst [1], lst [j] for h in range (2, len (lst)): print (lst) lst [j], lst [1] = lst [1], lst [j] lst [I] Lst [0] = lst [0], lst [I]
If the list is longer and there are more elements, the above general methods will be more difficult to implement, so let's implement them recursively.
Def permutations (position): if position = = len (lst)-1: print (lst) else: for index in range (position, len (lst)): lst [index], lst [position] = lst [position], lst [index] permutations (position+1) lst [index], lst [position] = lst [position], LST [index] permutations (0) "how to use python to output all permutations of list elements" ends here Thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!
