Drazen Zaric - Blogboard Journal

Python enumerate - How it actually works?

Python's built-in enumerate function simplifies iteration with a counter. Here we show how it's used and build it from scratch using iterators.

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Python Tuples - Basics, examples, unpacking, tuples vs. lists

In Python, tuples are a sequence data type, very similar to lists. We create tuples by using a comma-separated list of values.

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How to print to stderr in Python

In order to have Python print to stderr , we'll need to point the print function to the sys.stderr file. It's done slightly differently in Python 3 than in Python 2.

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The Zen of Python - Principles and History

The Zen of Python is a set of 19 principles written by Tim Peters. They were written to capture the guiding principles behind the design decisions for the early versions of the language.

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How to show rsync progress

How to show the progress of a long-running rsync transfer. Learn the several options with the important caveats.

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Priority Queue in Python

Priority queue is a data structure similar to a regular queue, but where elements have priorities assigned. Python comes with a built-in PriorityQueue class contained in the queue module.

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Python Swap - How to Swap Two Variables the Python Way

It's simple. For any two variables (a, b) we can swap their values in a single assignment statement

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Calculating Variance in Python - Explained

You have a list of numbers and you want to calculate its variance. Here are the methods to do that in Python.

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Python sort lambda - How to sort with lambda key function in Python

Sorting in Python is simple. You'll pass a list, dict or set to the built-in function sorted. Using the key parameter allows us to modify the default sorting behavior.

probability

Probability Interview Questions - Solution to Problem #1.4

There are two balls in a bag. I tell you that at least one of them is red. What is the probability that both are red?

probability

Probability Interview Questions

Basic probability. Counting. Generating random numbers. Probability distributions. Probabilistic algorithms.

Git ignore node modules - Simple Solution and Common Gotchas

Add the following line to your .gitignore file node_modulesIt will match the node_modules directory anywhere in your git repository. Don't forget to add .gitignore to git too: git add .gitignoreGotcha #1 - No .gitignore file If you don't have a .gitignore file,

SQL Group by Month - Examples in MySQL and Postgres

Quick Summary In MySQL you'll want to group by two fields YEAR(date), MONTH(date): SELECT YEAR(order_time), MONTH(order_time), COUNT(order_id) AS total_orders FROM orders GROUP BY 1, 2In PostgreSQL use the date_trunc('month', timestamp) function. SELECT date_

Leetcode Two Sum - The Optimal Solution in Python

Two Sum is a rather famous coding interview problem, often asked in Python coding interviews. Being problem #1 on LeetCode, you may also know it as the LeetCode Two Sum. The problem is stated as follows: Given an array of integers A = [a1, a2,

JSONPath in Python - Examples, Syntax and Tutorial

What is JSONPath? JSONPath is a query language for selecting and filtering elements of JSON structures. It's inspired by XPath, a query language used for selecting elements of XML documents. Based on the proposal by Stefan Goessner, JSONPath comes implemented in libraries for many

Pi in Python

Quick Summary Use the math.pi constant import math print(math.pi)3.141592653589793math is a module from the Python Standard Library, which means that you'll have it available with any Python version, without installing any additional packages. numpy.pi constantIf you're already using

What does git stand for?

Git is an open source distributed version control system. It was created in 2005 by Linus Torvalds. But you already knew that, right. So what's behind the name, git? You may be be surprised to know that it's not an acronym. In the words

gitroot – a Simple Command to Navigate to the Root of a Git Repo

One thing that always annoyed me is returning to top level directory in a git repo from somewhere deeper within. It turns out that there’s a really simple solution – just make a bash alias gitroot as follows. alias gitroot='cd $(git rev-parse --show-toplevel)

25+ Bad Leadership Quotes

Most terrible bosses have several common traits: They rarely or never recognize you for doing good workThey disrespect their reportsThey lack integrity and honestyThey can't communicate effectivelyThey don't give you timely and continuous feedback, neverYou don't want to be a terrible leader, and you

How to Write a List to a File in Python

TLDR: Print items line by line Use this method to write items of a Python list one by one to a text file. Python 3 cities = ['Atlanta', 'Boston', 'Chicago', 'Los Angeles', 'New York', 'San Francisco', 'Seattle'] FILE_PATH = './cities.txt' with open(FILE_

A/B Testing for Practical Significance

When doing statistical hypothesis testing, the math behind it gives us the toolset to determine the statistical significance of our observations. But if we're doing a two-sample test on a simple hypothesis, rejecting it won't tell us anything about the magnitude of the difference.

Kano Model Examples - Build Great Products With a Simple Mental Model

When in 2007 Steve Jobs first showed the original iPhone it seemed out of this world. Watch the event video and pay attention to the crowd reaction when Jobs shows pinch-to-zoom or when the phone automatically switches to landscape mode when he flips it in his hand. It was unbelievable.

Marketing Data Science - Case Studies from Airbnb, Lyft, Doordash

In this article we'll look at several case data science case studies from marketing optimization efforts at companies like Lyft, Airbnb, Netflix, Doordash, Wolt, Rovio Entertainment.

Designing Your Engineering Interview Process? Here's What You Need to Consider

If you simply take the standard format for the interviews, you could soon find yourself thinking about how to improve the process. You might find it slow and tedious; you could start seeing evaluations for the same candidate that widely differ or get negative feedback from candidates.

Code Review Best Practices - Lessons from the Trenches

In this article we'll go over learnings shared by engineers from companies such as PayPal, Palantir, Medium, Shopify. Why do code reviews and how they help your team develop?

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