How can I sum multiple list elements at the same time? For example, something like this in Python: Our lists (input): Output: Note: we don’t know how many list will be given to us. Answer This should do the job
Tag: list
Combine two lists and sort them
Lets say I have two lists. I want to append list2 into list1 and then sort and add a new element at a specific index. I keep getting an error message saying: TypeError: ‘<‘ not supported between instances of ‘list’ and ‘int’ This is what I have tried: Answer Use sorted()…
List comprehension returning two variables
I’m trying to do a list comprehension on two lists returning 2 variables in result. Using for loop: However, when I try to use list comprehension to do the same execution, it throws a SyntaxError Answer You need to have the whole thing in square brackets. Like this: That’s because you are doing th…
Sorting list based on dictionary keys in python
Is there a short way to sort a list based on the order of another dictionary keys? suppose I have: I want to sort the list to be [‘a’,’b’,’c’] based on the order of dic keys. Answer You can create a lookup of keys versus their insertion order in dic. To do so you can write:…
Python – Generate permutations by key from key value pair list
Problem: I am generating a search query from key=value pairs. The system being queried does not support searching by the same field twice. I need to generate all unique permutations (assuming that is the correct word) of the pairs so I can generate multiple queries. Example query: python test.py –search…
How to create new list of lists using for loop
I have two lists like I want to extract the required elements 1 and 3 from each list contained in values, to create a new list of lists like [[‘1234’, 50], [‘5678’, 100]]. I was able to solve the problem with a list comprehension: But how can I write the equivalent with explicit for lo…
Python: What is an efficient way to loop over a list of strings and group substrings in the list?
Background I would like to find and group the substrings in the list into a list of tuples where the first element of the tuple would be the substring and the second element would be the larger string that contains the substring. The expected output is given below I’ve written the following code which a…
Here is the problem discription: print(snake_array[0].x) AttributeError: ‘list’ object has no attribute ‘x’ . I cannot find the mistake
Answer The problem is that you are appending lists to snake_array, not Test objects. This is what you’re appending: [Test(300, 300, “RIGHT”)]. Notice that the brackets make it a list. All you need to do is remove the extra brackets. Like this:
printing a nested list without brackets and commas work, python
How do I print the given list in a such a way that the commas ‘,’ and the brackets ‘[]’ are separated, and there is a new line every three elements. I’ve tried the code given below, but it doesn’t work. I want the output to be like: basically, it’s a maze without the …
Check a list contains given elements
I want to check if my list’s first four elements are digits. what i did is as follows: But this gives the following error. How can I achieve this? Answer The error is telling you that you can’t do some_list in some_string – after all, a list consists of characters, not lists, so it’s p…