Pavol Kutaj – Medium

6 hours ago

Explaining differences between dict.get(key) and dict[key] in Python

The aim of this explainer💡 is to define the difference between <dict>.get(<key>) VS <dict>[<key>] in Python. 1. Get() is used when the missing key should not throw an exception, [] syntax when it should It allows you to provide a default value/expression if the key is missing …a sort of if/then mechanism without an if statement >>> d = {"name": "mr_paul"} >>> d.get("name") 'mr_paul' >>> d.get("job", …

Python

2 min read

Python

2 min read

1 day ago

Explaining Chain Comparisons in Python

The aim of this page📝 is to explain chain comparisons in Python — a feature not many languages have. — Taking a class on Python OOP, I found the following snippet and had no idea about the possibility of doing this up until now def celsius(self,value): if not ( HeatedRefrigeratedShippingContainer.MIN_CELSIUS <= value <= RefrigeratedShippingContainer.MAX_CELSIUS ):

Python

1 min read

Python

1 min read

2 days ago

Explaining Exit Command and Exit Status in Bash

The aim of this page📝 is to describe exit and exit statuses in bash, in the form of my footnotes under the wonderful Advanced Bash-Scripting Guide > Exit and Exit Status The exit command does 2 things terminates a script (just as in the C program) optionally, can return a value exit <n> therefore terminates a…

Bash

2 min read

Bash

2 min read

5 days ago

Explaining Different Approaches to Line Continuations in Bash, Python and Powershell

The aim of this page📝 is to review the concept of line discontinuation in bash, python and powershell. — The escape \ provides a means of writing a multi-line command. By default — each separate line constitutes a different command in Bash Escape character — \ - within echo command at the end of line escapes the newline, provided you put it into double quotes (quoting is a different story altogether)

Bash

2 min read

Bash

2 min read

5 days ago

The Most Interesting Tech Reads in January 2023

mostly fascinating takes on AI, but I’m also cheating and sneaking in some politics! — The aim of this page📝 is to share my monthly bookmarks. Book-wise, I’ve been reading the famous Pragmatic Programmer by Dave Thomas and Andy Hunt and Black Earth by Timothy Snyder GitHub Copilot preliminary experience report https://blog.ploeh.dk/2022/12/05/github-copilot-preliminary-experience-report/ Notes on Experience with Github Pilot, similar to that mine — it has the potential to surprise you…

Productivity

6 min read

Productivity

6 min read

5 days ago

Explaining Function Decorators in Python

Passing my learning experience in a way that ChatGPT cannot — The aim of this page📝is to define decorators. Please note that The “Decorator Pattern” ≠ Python “decorators”! — The Decorator Pattern Also note that decorators are utilizing the core ideas of functional programming — the higher order function — which makes it possible for functions to be passed as an…

Python

3 min read

Python

3 min read

Jan 26

Explaining Inheritance in Python Property Getters with the use of super()

The aim of this page📝 is to describe how python properties — getters — work with inheritance. — If interested, see also the previous installments on properties in Python in: https://medium.com/p/b47a24426238 https://medium.com/p/3151c7131c04 https://medium.com/p/9338606bfa21 We are working with shipping containers and you want to retrieve their volume rule#1: containers always have a constant width and height

Python

1 min read

Python

1 min read

Jan 17

Explaining Fast Power Algorithm in Python

The aim of this page📝 is to solve LeetCode > Pow(x, n) with the help of Jeff Erikson’s Algorithms. — The assignment says: Implement pow(x, n), which calculates x raised to the power n (i.e., x**n). x is not an int n is an integer and can be negative -231 <= n <= 231–1 -100.0 < x < 100.0 -10⁴ <= xn <= 10⁴ EXAMPLE Input: x = 2.00000, n =…

Leet

2 min read

Leet

2 min read

Jan 13

How to Measure the Length of Execution of a Selected Portion of Code in Bash

The aim of this page📝 is to share a simple way of measuring the duration of a selected portion of code execution in bash. — I am using ms unit To get the absolute timestamp, use $(date +%s%N | cut -b1-13) %s for seconds since the UNIX epoch %N adding nanosecond portion cut is selecting the first 13 fields of the nanosecond portion => milliseconds /$ date +%s 1673595770 /$ date +%s%N 1673595775334609500 /$ $(date +%s%N | cut -b1-13) 1673595775334…

Bash

1 min read

Bash

1 min read

Dec 29, 2022

How to use timeout command to terminate a command and proceed accordingly

The aim of this page📝 is to share my solution to the problem that I want to allow users into a Docker box only if the attempt to authenticate against Hashicorp Vault succeeds. — In other words, only if they are in VPN. It’s a bit of a leap of faith, I know. To diagnose if I am in VPN, I just use a blunt mechanism of timeout — if the program runs for > 5s, it follows that you are not in the…

Bash

2 min read

Bash

2 min read