multithreading

What Actually Triggers the Asyncio Tasks? Question: Trying to understand python asyncio coming from some background on multithreading with concurrent.futures. Here is the sample script #!/usr/bin/env python3 # encoding: utf-8 """Sample script to test asyncio functionality.""" import asyncio import logging from time import sleep # noqa logging.basicConfig(format=’%(asctime)s | %(levelname)s: %(message)s’, level=logging.INFO) async def wait(i: int) …

Abstract class for thread-related class without multiple inheritance Question: I want to create an abstract class for thread-related class. Class that want to enable threading must inherit threading.Thread class, however at the same time, class that want to enable the @abstractmethod must inherit abc.ABC class. Because multiple inheritance is a bad practice, can i achieve …

How to increase asyncio thread limits in an existing co-routine Question: I am currently working on a program using concurrency with asyncio. The code here is over simplified in order to show the problem. It is runnable without any dependencies if you need so. You have two tasks levels: 1: One in operation_loop which creates …

Using non-multithreaded PySimpleGUI window before multithreading Question: This question could also be rephrased as: Asking if a PySimpleGUI application should enable multithreading, by using a PySimpleGUI window. This illustrates the dilema I currently have. I have two versions of the application: Regular, that does things step by step. Threaded, that processes several dataframe lines further …

Gracefully handling keyboard interrupt for Python multi-processing Question: I am working on a project which runs two separate python processes. When I do a ctrl + c to end the program, I would like the program to end gracefully. I can produce a minimum working version of the code through the following: from multiprocessing import …

Can another thread release a lock held by another thread in Python? Question: I am trying to understand threading in Python via this website. Here, it has the following code for a single producer/consumer-type problem: import random SENTINEL = object() def producer(pipeline): """Pretend we’re getting a message from the network.""" for index in range(10): message …

Events for stopping Threads vs ThreadPoolExecutor Question: I’m trying to understand all the differences between using a ThreadPoolExecutor and just using threads in python. I tried to use a threadpoolexecutor, and it seemed to act as a blocking function (the context didnt seem to move on and allow the main thread to continue). When I …

parallelization of downloading thousands of files using wget Question: I have thousands of the files like below to be downloaded. urls = [‘https://ladsweb.modaps.eosdis.nasa.gov//archive/allData/61/MOD03/2019/001/MOD03.A2019001.0450.061.2019001110251.hdf’, ‘https://ladsweb.modaps.eosdis.nasa.gov//archive/allData/61/MOD03/2019/001/MOD03.A2019001.0455.061.2019001110452.hdf’, ‘https://ladsweb.modaps.eosdis.nasa.gov//archive/allData/61/MOD03/2019/001/MOD03.A2019001.0500.061.2019001110658.hdf’, ‘https://ladsweb.modaps.eosdis.nasa.gov//archive/allData/61/MOD03/2019/001/MOD03.A2019001.0535.061.2019001110116.hdf’, ‘https://ladsweb.modaps.eosdis.nasa.gov//archive/allData/61/MOD03/2019/001/MOD03.A2019001.0555.061.2019001132709.hdf’, ‘https://ladsweb.modaps.eosdis.nasa.gov//archive/allData/61/MOD03/2019/001/MOD03.A2019001.0615.061.2019001132734.hdf’, ‘https://ladsweb.modaps.eosdis.nasa.gov//archive/allData/61/MOD03/2019/001/MOD03.A2019001.0630.061.2019001132950.hdf’, ‘https://ladsweb.modaps.eosdis.nasa.gov//archive/allData/61/MOD03/2019/001/MOD03.A2019001.0635.061.2019001133203.hdf’, ‘https://ladsweb.modaps.eosdis.nasa.gov//archive/allData/61/MOD03/2019/001/MOD03.A2019001.0650.061.2019001132727.hdf’, ‘https://ladsweb.modaps.eosdis.nasa.gov//archive/allData/61/MOD03/2019/001/MOD03.A2019001.0655.061.2019001132653.hdf’] I can download them one by one using wget as follows. #wget is here, https://eternallybored.org/misc/wget/1.21.3/64/wget.exe import os, glob, subprocess import itertools import multiprocessing …

How to make a Python threaded program (with Locks) to run on multi-process? Question: I have a multi-threaded program, and I want to let the user choose how to run them, either in serial, multi threads or multi cores, at least at the top level. A runnable demo is shown below illustrating my program’s logic. …

Python threading.Thread : random occurrences of missing final newline of print() Question: I am just in a process of learning how to use the Python threading module and come up with following code which should help me to understand how threading works: from time import sleep from threading import Thread closeAllThreads = False threadCounter = …