How do I get all n! combinations of possible lists that can be created from numbers 1 to n? Question: It’s kind of difficult to explain, so let me give an example: For n=3, I want to make all lists: [1, 2, 3] [1, 3, 2] [2, 1, 3] [2, 3, 1] [3, 1, 2] …
How to calculate totals of all possible combinations of columns Question: I have the following df: df = pd.DataFrame({‘a’: [1,2,3,4,2], ‘b’: [3,4,1,0,4], ‘c’:[1,2,3,1,0], ‘d’:[3,2,4,1,4]}) I want to generate a combination of totals from these 4 columns, which equals 4 x 3 x 2 = 24 total combinations minus duplicates. I want the results in the …
Python itertools.groupby gives unexpected results when sorting by binary representation Question: I am trying to solve a simple problem using itertools.groupby: group the numbers from 0 to 7 according to the number of 1‘s in their binary representation. So I want to produce the mapping {0: [0], 1: [1, 2, 4], 2: [3, 5, 6], …
How can I make all possible pairs between arrays? Question: Let’s say I have the following list: lst = [[1,2],[3,4,],[5,6]] There are only three lists within this list, but there could be more. I want to write a script that will give me the following combinations: [[1,3],[1,4],[1,5],[1,6],[2,3],[2,4],[2,5],[2,6],[3,5],[3,6],[4,5],[4,6]] The order does not necessarily need to be …
Can't flatten lists and remove duplicates when it's a dict value, for each dict key? Question: I have the following dict: my_dict = {‘a’: [[‘a’,’b’,’c’], [‘a’,1,4]], ‘b’:[[1,2,3], [1],[8,2,2,1]]} (The original dict is much larger) I want to go over all values, merge lists in one and remove duplicates, for each key. I am doing it …
How to build a list of growing initials of a string with itertools? Question: I have a Python string:"d4 d5 c4 e6 Nc3 Be7 Nf3 Nf6 Bg5 h6 Bf4 0-0 e3 Nbd7 g4 dxc4" I want to split it into: ["d4", "d4 d5", "d4 d5 c4", … , "d4 d5 c4 e6 Nc3 Be7 Nf3 …
how to use itertools methods so that they show all possible combinations Question: I need to find absolutely all possible combinations, including taking into account their position. for example, the combination 222, 200, 220 does not come out in any way. what else can be done? Here is mu code: import itertools real_code = ‘220’ …
What is the Python itertools cycle equivalent in Javascript? Question: I could not find an equivalent function of Python cycle in itertools: from itertools import cycle g = cycle((‘a’,’b’)) next(g) # a next(g) # b next(g) # a # etc. etc. in Javascript. The goal is to create an infinite cycle in an array of …
How to find intersection of two sentences and include substrings Question: I am comparing sentences with jaccard similarity in Python. However, I have a question for the intersection function: import itertools import pandas as pd item1=’She went to a restaurant on Oxford Street’.split(‘ ‘) item2=’She went to an Italian restaurant on Oxf. Street’.split(‘ ‘) set.intersection(*[set(item1), …
Create data frames for each unique permutation of groups of a Dataframe Question: Suppose I have the following Dataframe in Python: input_df = pd.DataFrame({ ‘Previous’: [‘1000’, ‘1000’, ‘latex’, ‘latex’], ‘Ignore’:[None, None, [‘free’], [‘free’]], ‘New’: [‘100’, ‘200’, ‘nylon’, ‘cloth’]}) I would like to generate the following four dataframes: df1 = pd.DataFrame({ ‘Previous’: [‘1000′,’latex’], ‘Ignore’: [None, [‘free’]], …
