Python List or any Iterable Comprehension

List comprehensions provide us with a simple way to create a list based on some iterable. During the creation, elements from the iterable can be conditionally included in the new list and transformed as needed.

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OCSP Stapling on Nginx and Apache webserver

Have you error 'ssl_stapling_init_cert: Can't retrieve issuer certificate!' in your apache log file? Or error 'OCSP_basic_verify() failed (SSL: error:27069065:OCSP routines:OCSP_basic_verify:certificate verify error:Verify error:unable to get local issuer certificate) while requesting certificate status' in your nginx error file? Probably you have a misconfigured web server for OCSP STAPLING support

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How to Change Hostname on Debian Linux

This tutorial explains how to change the hostname on Debian 10 Buster without restarting the system.

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Python Sorting Libraries and Algorithms Benchmark/Comparison

Python, Numpy, Pandas, PyTorch, TensorFlow & SQL sorting libraries and algorithms comparison

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Top 5 sorting algorithms with Python code

How work bubble sort, insertion sort, selection sort, merge sort and quick sort and what of them is best.

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Epson printer error - An ink pad needs Service

Are you owner epson printer and have you error message 'An ink pad needs Service, contact Epson' on your printer display?

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JavaScript Tricks You Won’t Find in Most Tutorials

Useful tips for writing more concise and performant JavaScript

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SSH - Too Many Authentication Failures

When I try connect to my ssh server, I started seeing this error recently: Received disconnect from a.b.c.d port 22:2: Too many authentication failures for

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How manage log files with LOGROTATE

Understanding logrotate utility, How does logrotate know if should rotate log files or not and How debug Logrotate utility.

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Python DocStrings, Annotations and PEP8

Guide how to write perfect Python DocStrings, how write annotations and what is PEP8

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Explanation DMARC (Domain-based Message Authentication, Reporting and Conformance) in all details

Domain-based Message Authentication, Reporting, and Conformance, or DMARC, is a technical standard that helps protect email senders and recipients from spam, spoofing, and phishing.

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Explanation SPF (Sender Policy Framework) in all details

Sender Policy Framework (SPF) is an email authentication method designed to detect forged sender addresses in emails (email spoofing), a technique often used in phishing and email spam. SPF allows the receiver to check that an email claiming to come from a specific domain comes from an IP address authorized by that domain's administrators. The list of authorized sending hosts and IP addresses for a domain is published in the DNS records for that domain. SPF together with DKIM are based stones to DMARC

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