Questions tagged [python]

Python is an interpreted, general-purpose high-level programming language whose design philosophy emphasizes code readability. Use the python tag for all Python related questions. If you believe your question may be even more specific, you can include a version specific tag such as python-3.x.

1,589 questions with no upvoted or accepted answers
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14
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0answers
914 views

Django on virtual machine - watching changes in static files and autocompiling LESS without inotify

I'm setting up a Django development environment using Vagrant to run an Ubuntu virtual machine on VirtualBox. As this is a student project run mostly by very amateur coders and I want everyone to be ...
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1k views

Flask view dependency injection

I've been into trying to have an as simple as possible dependency container in Python and with your help managed to conceive TinyDIC, many thanks. Now, I use Flask for my apps, and from by background ...
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3k views

Sending notifications with Django channels

I have project on Django wich use Django Channels. I use Django Channel for sending notifications to users who are subscribed to articles changes (adding/editing/deleting comments on article). So I'...
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756 views

Let's register that Django user

Short intro So, I've been using Django for a while now and thought it would be nice to start a simple application. In an ideal World, each app must have a way of letting its users register and that's ...
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1k views

Cyther: The Cross Platform Cython/Python Compiler (Take 2)

I recently posted an earlier version of this code on Code Review, and now with the given suggestions and many other improvements, I am back. I included the description of exactly what Cyther is ...
8
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1answer
137 views

A Server and Client Chatroom Using Sockets and Threading

I made a chatroom with a server and client python files, using Sockets and Threading as a project. I'm interested to acquire ...
8
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1answer
263 views

Clone of mobile game Ballz

I have made a clone of the mobile game Ballz, and it works quite well. However, there are a few problems: Performance. When I have more than 50 balls in the game, the FPS dips from 60. I am unsure ...
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121 views

Calculation of independence test statistic

This code (~30lines) detects independence between variables in a dataset, by using a bootstrap of a statistic. This is fully-broadcasted, but it's still long. Reading it, or making it run, do you ...
7
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0answers
57 views

A program that calculates how dense each character appears when printed

I wanted to know how "dark" each character is when printed. I thought that this may be useful when doing ASCII-art to help with shading. I decided to write a program to objectively measure ...
7
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0answers
90 views

Using get_dummies to create a Simple Recommender System - Cold Start

Question: was using get_dummies a good choice for converting categorical strings? I used get_dummies to convert categorical ...
7
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155 views

Multithreaded HD Image Processing + Logistic reg. Classifier + Visualization

[I'm awaiting suggestions for improvement/optimization/more speed/general feedback ...] This code takes a label and a folder path of subfolders as input that have certain labels ex: trees, cats with ...
7
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160 views

Get a movie directory, rename it and save imdb info as a webpage

I have my movie folders formatted: ~: no sub included {}: already watched nothing: sub included, ready to watch the program asks for the movie directory; extracts the name and searches IMDb for the ...
7
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1k views

Codewars: N-dimensional Von Neumann Neighborhood in a matrix

Task: For creating this challenge on Codewars I need a very performant function that calculates Von Neumann Neighborhood in a N-dimensional array. This function will be called about 2000 times The ...
7
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0answers
913 views

Parsing different categories using Scrapy from a webpage

I've written a script in Python Scrapy to parse different "model", "country" and "year" of various bikes from a webpage. There are several subcategories to track to reach ...
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1k views

Read quantization tables from JPEG files

I'm developing an application that will hide information inside the quantization tables of JPEG files. It's called DQTsteg, if you want to know more about what I'm attempting to do. Right now I'm ...
7
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0answers
440 views

Hit the target number

After I played the game "The Mesh" for a while I figured that I wanted to make a solver in Python. See the video on the website for a quick intro, I also explain the rules below. The Mesh ...
7
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2k views

Joystick to mouse/keyboard mapping program

I've been working on a project to map a joystick (in my case Logitech Extreme 3D) to mouse and keyboard so I can use it for web games that don't support gamesticks. My design goals are: Flexibility - ...
7
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2k views

Improving the Flask cache decorator

In my rumblings developing flask applications I found the caching decorator. The decorator is a short and well-written piece of code, but I feel like it misses the few points bellow: It only caches ...
6
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0answers
85 views

Booking an East London Tennis Court

Description I'm not sure if it Covid-19 but lately it is impossible to book a tennis court in my area on time. It's always full or maybe just don't check enough :) To beat the queue and get notified ...
6
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0answers
179 views

Xero API Client in Django

I'm not actually that new to writing Python. But I've no formal training and have only learnt to build applications to solve problems for my job out of necessity. Starting to bring my existing skills ...
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0answers
85 views

Code optimisation: Converting dataframe to numpy's ndarray

I am working with a dataframe of over 21M rows. ...
6
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0answers
54 views

Subtracting elements of datasets of an HDF5 file

I am trying to solve the following problem: Input: Input is two arrays (Nx4, sorted in column-2) stored in datasets-1 and 2 in HDF5 file (input.h5). N is huge (...
6
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2answers
178 views

Web scraper for driver's license test times

I have created a small selenium script that checks for available times to write a test for a drivers license. The program runs every minute and takes approx 50 seconds to run. I have noticed that it's ...
6
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0answers
703 views

Recursive and iterative implementation on Kosaraju algorithm

Kosaraju algorithm is mainly phrased as two recursive subroutines running postorder DFS twice to mark SCCs with linear time complexity O(V+E) below, For each vertex u of the graph, mark u as ...
6
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64 views

Python - Displaying messages in ArcPy/IDLE

I have created a wrapper for displaying messages with ArcPy and IDLE (as that is all I have available to myself due to certain circumstances) as I frequently use both to test and develop new tools. ...
6
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0answers
239 views

How to make my groupby and transpose operations efficient?

I have a DataFrame of size 3,745,802 rows and 30 columns. I would like to perform certain groupby and ...
6
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0answers
4k views

Cubic spline interpolation in Python from scratch

I implemented the cubic spline interpolation explained in https://en.wikipedia.org/wiki/Spline_interpolation as a Python class. Of course, such an interpolation should exist already in some Python ...
6
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0answers
193 views

Reading sparse matrix from binary file

I have binary files containing sparse matrices. Their format is: number of rows int length of a row int column index int value float Reading ...
6
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0answers
734 views

Asyncio HTTP Request Queue

I wrote a simple sitemap.xml checker using asyncio and aiohttp. I followed the documentation demonstrating the producer/consumer pattern. However, I noticed that as the URLs scale larger, it seems to ...
6
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0answers
636 views

Laminar flow in a pipe animation using Tkinter

I wrote this simple particle flow animation with Tkinter. I wanted to ask if there is some major improvements you can think of regarding the animation motor or the documentation of my code? I noticed ...
6
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0answers
222 views

Selection sort with reduced comparison count: Python iteration 2

Follow up to Selection sort with reduced comparison count - semi-final Iteration? My goal (and excuse not to tag reinventing…) is to have presentable code to argue the viability of reducing the number ...
6
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0answers
8k views

Example of multithreading in Python3 / PyQt5 using QThread

I wanted to make a simple example of multithreading with QThread in PyQt5 / Python3. The script generates a set of QLineEdits and buttons to start and stop a set of ...
6
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0answers
391 views

Simple AR Tag classifier

I have been working on creating a simple AR Tag classifier, for detecting a simple AR Tag glyph. Spitting out an image that looks like this: With the red circle indicating the corner closest to the ...
6
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0answers
2k views

Calculating T-Test within Large Pandas Dataframes

The below code runs a t-statistic within a large dataframe (rnadf) based on masked values from another dataframe (cnvdf_maked). ...
6
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0answers
73 views

Pyspark Solver for Tiered Board Games

I've written a Pyspark program that will completely solve a tiered board game (no loops, each game position is a member of only one tier) and writes each tier to a file. It also determines the ...
6
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0answers
3k views

Real-time bitcoin data feed and storage using websocket framework

I'm trying to create data feed script for real time bitcoin data for OkCoin exchange using their websocket API (documentation) and a database manager for storing. There are two channels I am ...
5
votes
1answer
67 views

GUI that reads data and generates/ saves charts

I have a program that uses pandas to read csv files and then generates and saves graphical charts. I have been trying to follow the SOLID principles so I have tried to seperate responsibilities. So ...
5
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0answers
54 views

Thread Art Generation that Creates Embroidery Files

I have made a thread art generator that creates thread patterns from images. Mine is a bit different as it outputs an embroidery file (It embroiders quite nicely, though the settings need a lot of ...
5
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0answers
96 views

Pi Calculator Using BBP (Bailey–Borwein–Plouffe) - Written in Cython With MPFR

I wrote a Pi Calculator using the BBP Algorithm in Cython. My specific goals are make the code more legible and more performant. This is a purely academic script in order to teach me how to implement ...
5
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0answers
40 views

Process Injector using ctypes and the Windows API

To get some practice with the Windows API and ctypes, I decided to write a program capable of injecting and running shellcode inside of another specified process. ...
5
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0answers
84 views

stable producer/consumer threads in python

I have implemented a producer/consumer functionality using threads in a given framework and I'm pretty sure I did not cover all possible scenarios. I made a small reproducible version. Lines ending ...
5
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0answers
74 views

Neural Network Written in Python is Extremely Slow

I coded a basic feedforward neural network with all pure python with the exception of numpy in order to better understand how neural networks work. It works, but the only problem is it is extremely ...
5
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1answer
135 views

Sinewaves and FFT plotter

I am trying to code a sin wave with 5 sliders: frequency, amplitude, phase change, number of data points, and time. I am currently trying to link my phase change slider with my graph so that it ...
5
votes
1answer
110 views

Image puzzle PIL tkinter

I'm a hobbyist programmer(just having fun) created a small script that takes a photo and resizes it, then cuts it up into 24 pieces. The chunks are transposed and made into buttons. Your task is to ...
5
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2answers
94 views

Get exactly `n` unique randomly sampled rows per category in a Dataframe

I want to get exactly n unique randomly sampled rows per category in a Dataframe. This proved to be involve more steps than the description would lead you to ...
5
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0answers
165 views

Python version of Clean Code book example

I started reading Robert Martin's Clean Code. I'm trying to "translate" all his examples into Python, so I can understand them better since my domain on Python is greater than on Java. ...
5
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0answers
393 views

safexl - A Python / pywin32 Excel Application wrapper

Thanks in advance for your interest in my first PyPI project. While there happen to be a number of projects out there to help with creating & consuming Excel workbooks, I was unable to find one ...
5
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0answers
66 views

Machine Learning Implementation

I am new to ML and I wanted to implement a Linear Regression to predict a golfer's scores based on certain feature supplied to my model. I would like a review to see if I'm implementing this correctly ...
5
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0answers
72 views

K nearest neighbours algorithm

Here is a project that I worked on for a few days in June 2020. Since the algorithm is extremely slow, I looked into methods in order to parallelize operations but did not obtain any satisfactory ...
5
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0answers
349 views

Selecting child contours in OpenCV

I'm really new to OpenCV. :) I have been working on this for almost an entire day. After hours of sleepless work I would like to know if I can further improve my code. I have written some code to ...

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