Given a list of distinct integers (decreasing order), return True if there is atleast position p, such that the value at position p is p. For instance, List = [4, 3, 2, 0], the function returns true since 2 is at index 2. I know we can just go for a loop and check if list[i] == i. I was
Tag: python
Multiple “calculation AND assignment” operations in one line of python?
Let’s say I would like to divide by 2, add 1 and multiply by 5. Something like obviously doesn’t work. I tried different combinations using parentheses and the walrus operator, but couldn’t produce produce something working, even less something well readable Answer This isn’t something…
importing for loop output to another for loop
I am facing problem while importing the output of a for-loop to another for loop. My python script Actually facing problem in this line of code e = {d[0]: c, d[1]:[2.0,2.0]}, where value of c should be different but by this script i am getting repeated value. Answer Your problem is that you keep over writting…
what is the best way to create running total columns in pandas
What is the most pandastic way to create running total columns at various levels (without iterating over the rows)? input: output: The test column can only contain X’s or NaNs. The number of consecutive X’s is random. In the ‘desired_output_level_1’ column, trying to count up the numbe…
Find root to leaf path with given sum. Code succeeds with string, fails with list
I am looking at a binary tree problem. The goal is to find all path(s) from root to leaf, such that the values on the path sum up to a given k. For that purpose I have written the same algorithm in two different ways: The first version uses a string parameter a. The second version uses a list parameter
Fastest way to get dot product of a matrix and each point in the given array
I have an array Nx3 of N points, each one has X, Y and Z coordinate. I need to rotate each point, so i have the rotation matrix 3×3. To do this, i need to get dot product of the rotation matrix and each point. The problem is the array of points is quite massive (~1_000_000x3) and therefore it takes
This Python code gives unwanted output when query_words if of size greater than 1
I’ve written some code, but it does not output what I expected. Here is the code: The expected final value of big_ds is: {123: {‘dollar’: [‘currency’], ‘probabilistic’: []}, 108: {‘dollar’: [], ‘probabilistic’: [‘probabilistic’]}} B…
Retrieve specific fields of a namedtuple instance from a nested list in Python
I am starting a project for school, a basic text-adventure game, where the player navigates through several rooms, each with a set of items, and adds an item to their inventory by spending a turn. Since each item is unique to a room and each item is also unique in its stat benefits, I have done the following …
Remove the intersection between two curves
I’m having a curve (parabol) from 0 to 1 on both axes as follows: I generate another curve by moving the original curve along the x-axis and combine both to get the following graph: How can I remove the intersected section to have only the double bottoms pattern like this: The code I use for the graph: …
Scikit Image load binary image and convert to binary matrix
I have created a numpy array shape(11 x 11) with all pixels 0 excluding one column filled with 1. The array was saved as a png image using matplotlib.imsave yielding the expected image – black background with a white line in the middle. When trying to reimport the saved png image skipy.imread and Pil.Im…