Python Developer

I have a triangular tessellation like the one shown in the figure. Given N number of triangles in t… Read more Finding Nearest Neighbours Of A Triangular Tesellation

I have many pandas DataFrames for stocks. They all have the form: df_asset = pd.DataFrame(data=np.r… Read more Merging All Columns Of Pandas Dataframes

I have just realised that for a specific module in my programme, return or not a list of instances … Read more Returning Lists Of Instances Makes No Difference? And What About Performance?

I am writing a python program to preprocess images to be used as labels for a semantic segmentation… Read more How Can I Efficiently Map Each Pixel Of A Three Channel Image To One Channel?

I have a DataFrame with >1M rows. I'd like to select all the rows where a certain column con… Read more Pandas: How To Limit The Results Of Str.contains?

I have a 384MB text file with 50 million lines. Each line contains 2 space-separated integers: a ke… Read more Reading Huge File In Python

I have large binary data files that have a predefined format, originally written by a Fortran progr… Read more Fastest Way To Read A Binary File With A Defined Format?

Is there a good, performant and/or recommended way to declare and provide JS dependencies for block… Read more Django, Recommended Way To Declare And Solve Javascript Dependencies In Blocks

I'm looking for the time complexity of these methods as a function of the number of rows in a d… Read more What Is The Time Complexity Of .at And .loc In Pandas?

I accidentally found that in python, an operation of the form string1.join(string2) Can be equival… Read more Replacing The Empty Strings In A String

I was writing a new random number generator for numpy that produces random numbers according to an … Read more Creating Small Arrays In Cython Takes A Humongous Amount Of Time

I write a very simple code which contains summation of arrays by using both Fortran and Python. Whe… Read more Dramatic Slow-down When Executing Multiple Processes At The Same Time

Assume I have a 1d array, what I want is to sample with a moving window and within the window divid… Read more How To Sample A Numpy Array And Perform Computation On Each Sample Efficiently?

Data: theta is a vector of N angles. Question: How to create a vector of N 2D rotation matrix from … Read more How To Vectorize The Creation Of N Rotation Matrix From A Vector Of Angles?

I have a code which reassigns bins to a large numpy array. Basically, the elements of the large arr… Read more Improving Runtime Of Python Numpy Code

I have two numpy arrays, X and Y, with shapes (n,d) and (m,d), respectively. Assume that we want to… Read more Why Is Vectorized Numpy Code Slower Than For Loops?

I have a matrix Y of shape (n, d). I already calculated the pairwise row-differences in the followi… Read more Put Pairwise Differences Of Matrix Rows In 3-d Array

I have a use case where I need to build a list from the lines in a file. This operation will be pe… Read more Unpickle A Data Structure Vs. Build By Calling Readlines()

PROBLEM A zero-indexed array A consisting of N integers is given. An equilibrium index of this arra… Read more Index In An Array Such That Its Prefix Sum Equals Its Suffix Sum - Best Solution

I want to replace a very long string according to dictionary. My code is like that: def rep(self, m… Read more Fast Way To Replace A String According To Dict