How to sum the values of specific keys while iterating over a dictionary in python? Question: Create a solution that accepts an integer input identifying how many shares of stock are to be purchased from the Old Town Stock Exchange, followed by an equivalent number of string inputs representing the stock selections. The following dictionary …
How to stack summing vectors to numpy 3d array? Question: I have a 3d numpy array that looks like so: >>> g array([[[ 1., 1., 1., 1., 1.], [ 0., 0., 0., 0., 0.], [ 1., 2., 3., 4., 6.]], [[ 0., 0., 0., 0., 0.], [11., 22., 33., 44., 66.], [ 0., 0., 0., …
How to selects items by argument and sums them in another function Question: Hi I basically have example how Write a program to track family income and expenses. So I need to 2 functions one that adds items into seznam ok I did that. 2 functions that selects items by argument and sums them. How …
SymPy – Is there a way to write a summation, that has a variable with an incrementing subscript? Question: I wanted to write this expression, in code: x1 + x2 + x3 + x4 + x5 I can currently do this via: import sympy as sp x1, x2, x3, x4, x5 = sp.symbols(‘x1 x2 x3 …
How to count how many times a word in a list appeared in-another list Question: I have 2 lists and I want to see how many of the text in list 1 is in list 2 but I don’t really know of a way to like combine them the output isn’t summed and I have …
How do I solve a two-sum problem with multiple solutions? Question: So essentially it is a simple two sum problem but there are multiple solutions. At the end I would like to return all pairs that sum up to the target within a given list and then tally the total number of pairs at the …
How to get partial cumulative sums (of positive and negative numbers) in an array? Question: I have an array with positive and negative numbers and want to do a cumulative sum of numbers of the same sign until the next number carries an opposite sign. It starts again at 0. Maybe better explained with a …
Find all combinations that add up to given number python with list of lists Question: I’ve seen plenty of threads on how to find all combinations that add up to a number with one list, but wanted to know how to expand this such that you can only pick one number at a time, from …
Calculating the cumulative sum in a list starting at the next element and going through the list in Python Question: Let’s say I got a list like this: L = [600, 200, 100, 80, 20] What is the most efficient way to calculate the cumulative sum starting from the next element for every element in …
I have a 2d list of strings and numbers. I want to get the sum of all numbers that have the same string. Code is in python Question: I have a list the contains names and numbers. And for all items with the same name in the list I want to calculate the sum of …
