Itertools without repetition but with multiple combinations Question: i can’t seem to find a way to use itertools without repetitions while keeping multiple combinations. What I want : > my_list = [‘a’, ‘b’, ‘c’] > the_result_i_want = [‘ab’, ‘ac’, ‘ba’, ‘bc’, ‘ca’, ‘cb’] What I manage to do so far : for i in range …
iterating over dynamically augmented iterator Question: I am iterating over lines of a file, but if a line matches a certain pattern, I first need to recursively iterate over another file. I’m using itertools.chain to extend the iterator. The problem is (probably) that the for loop in the __iter__ method makes a copy of the …
create a python list with combinations of the first element with the rest of list without repeat tuples in a combination Question: I’m trying to create a list of tuples in python with the combinations of first element of list with the rest elements of the list but without repeat the first element of the …
Find all permutations of a string that is variable only at specific positions in Python Question: I have a DNA sequence which is variable only at specific locations and need to find all possible scenarios: DNA_seq=’ANGK’ #N can be T or C and K can be A or G N=[‘T’,’C’] K=[‘A’,’G’] Results: [‘ATGA’,’ATGG’,’ACGA’,’ACGG’] Searching online, …
Yet another combinations with conditions question Question: I want to efficiently generate pairs of elements from two lists equal to their Cartesian product with some elements omitted. The elements in each list are unique. The code below does exactly what’s needed but I’m looking to optimize it perhaps by replacing the loop. See the comments …
Creating permutations of tree diagram dynamically and scalable Question: I am trying to create permutations which follows a datatree design in Python. The root should be dynamically and could contain a list of lists. This image shows how the permutations should be created Arrows show allowed combinations. This image explains what could be combined in …
Create combinations from two lists based on variable number of items from first list Question: I’ve been struggling with this one for a bit, so I thought I would reach out! So I have two lists of index locations that I need to generate combinations from. (Originally I had one list, and attempted to use …
Regrouping a list of dictionary Question: I have a list of dictionary from a database query. I want to group the data by "id" and also add some new key-value pairs based on some existing data in the dictionary. Here is the data: data = [{‘id’: 1, ‘name’: ‘The Musical Hop’, ‘city’: ‘San Francisco’, ‘state’: …
Increasing number of permutations of all possible combinations of a list with repetitions allowed Question: I am trying without success to understand how to use itertools to generate a list with all possible combinations of the elements of a list, with an increasing size of elements to pick and including repetitions. I would like to …
Create all possible combinations of lists of different sizes in numpy Question: I want to create a numpy array with all possible combinations of items from multiple lists of different sizes: a = [1, 2] b = [3, 4] c = [5, 6, 7] d = [8, 9, 10] In each combination, I want 2 …
