The challenge You are given a binary tree: Your task is to return the list with elements from tree sorted by levels, which means the root element goes first, then root children (from left to right) are second and third, and so on. Return empty list if roo... (more…)

We recently explored how wealthy countries (those defined as high-income by the World Bank) tend to visit a different set of technologies than the rest of the world. Among the largest differences we saw was in the programming language Python. When we focu... (more…)

In this video, we'll build a Python web scraper that retrieves the top 20 most frequent words with their percentages in an English Wikipedia article. Code fo...

I was writing a lambda function which, among other things, was supposed to read a csv file from S3, perform some validation on every row, then use boto3 to perform an S3 multipart upload. I created a wrapper class around the multipart upload functionality... (more…)

Ben Hoyt is an experienced software engineer at TripAdvisor in New York City. He and his wife and three daughters live just across the Hudson River in New Jersey. (more…)