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Python dataframe vectorizing for loop

I would like to vectorize this piece of python code with for loop conditioned on current state for speed and efficiency. values for df_B are computed based on current-state (state) AND corresponding df_A value. Any ideas would be appreciated. Answer This seems overkill. Your state variable basically is the pr…

Is there a pythonic way to “hot swap” a list?

Generally modifying the list you’re looping through is considered bad form, but I haven’t found a pythonic way around my issue. The crux of the problem is that I have to start the loop and perform some actions before I will know how long my list will be. I can safely assume there is a least 1 item…

How to properly copy a list in python

I would like to keep track of bubble sorting algorithm’s intermediate states at each iteration. I’ve tried to cache them in dictionary while loop is running, but i keep getting the same state all the time Here is my code: Here is the output: As you can see, it outputs sorted list each time. What a…

Drawing a simple image, displaying it, and closing it

I am trying to do some simple drawings. I wanted to use opencv (cv2) because on a second project I have to display a small animation (rectangle, size depending on a variable; updated every X seconds). However, I do not have experience with image processing libraries and opencv. I am running into a lot of prob…