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.

1,468 questions with no upvoted or accepted answers
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14
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889 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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0answers
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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724 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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0answers
935 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 ...
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61 views

My Blackjack Game in Python

I am a beginner programmer ( just recently picked it up ). I just completed my first ever project, that is creating a Blackjack game in Python. I would like to know your opinions about it and how it ...
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0answers
104 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
85 views

parallel processing of files from a directory

This code does parallel processing of files read from a directory. It divides the directory into 'core' number of file chunks and process those chunks in parallel. 'cores' is the number of cores in ...
7
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0answers
80 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 ...
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0answers
149 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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0answers
140 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 ...
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990 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
421 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 ...
6
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0answers
165 views

Quiz Game using Tkinter in Python

I have made part of a quiz game and realize that if I continue down this route my code could get huge, is there a way to simplify my code or make it more efficient? The first couple of lines of ...
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0answers
65 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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2answers
78 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 ...
6
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0answers
107 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 ...
6
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0answers
76 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
44 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 ...
6
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0answers
47 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
101 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
467 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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58 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
200 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
3k 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 ...
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167 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
663 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
936 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 ...
6
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0answers
794 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 ...
6
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0answers
603 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
211 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
365 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
72 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
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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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
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0answers
31 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
65 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 ...
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0answers
71 views

Simple chat server in Python

I'm new to both Python and socket programming and figured setting up a simple chat server would be good practice. In addition to general critiques of the code, I have specific questions: What are the ...
5
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0answers
56 views

Word finder using pygame

I made a word searching app that allows the user to inout words into a text box, and parts of the word grid will be highlighted to show the location of the words. The letters of the grid can be edited ...
5
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0answers
200 views

Slow copying of memmap array to numpy array

I have multiple binary (structured) file, each of 2GB, which I am currently reading in pair, using memmap to cross-correlate the same. I want to minimise the time required by this IO process, in the ...
5
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0answers
128 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
264 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
61 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
68 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
153 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 ...
5
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0answers
221 views

Coffee machine project using Python OOP

This is my first project using Python OOP. I don't know whether the code I have written is correctly or not. How can I make this code feasible? Machine.py Class containing some default values ...
5
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0answers
67 views

Dealing Synchronous Request in Asynchronous Code

Problem I am trying to convert my synchronous code to an asynchronous implementation. Using aiohttp I was able to almost get where I want. My problem is how to ...
5
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0answers
145 views

Simple dmenu launcher for passwords, docs, notes and application shortcuts (Python)

I created a small script for automating password store management and quickly searching and launching notes, shortcuts and documents through some keybindings that will execute the script. Script is ...

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