Today, I tried a data transformation that seemed so obvious: splitting the string values of a Pandas column on a delimiter and one-hot encode the resulting strings. However, it took me quite some time to figure out how to do it elegantly. Here’s what I wanted to achieve. I had…
This a brief overview on how to find the dependencies of a Python package. You might need this in case you have to upload packages to a custom package repository or conda channel. Let’s dive in. Find package dependencies with PyPi JSON endpoint To find a Python package’s dependencies, you…
In this article, you’ll learn how you can get metadata from your pipeline run inside your pipeline’s notebooks (or other activities). The documentation on this subject is relatively limited, so I hope it will prevent a lot of wasted time. In Airflow, you have macros, to refer to the metadata…
As of this week, I can call myself a Google Cloud Certified Professional Data Engineer, after passing the assessment. In this blog post, I would like to share my experiences for preparing and taking the exam. I hope they’ll help you in one way or another. The whole preparation took…
Coming from Airflow, I expected macros to be all over the place in Kubeflow. Surprisingly, it took me a lot of time to scramble some pieces of documentation on how to use them. In this blog post, I’ll try to give an overview of how and where you can use…
Sometimes you just want to know if a particular external table or schema exists in Amazon Redshift (Spectrum). This article outlines various alternatives to achieve that. First, if you’d like to list the tables that match your criteria, you can do that by querying SVV_EXTERNAL_TABLES. This table has some interesting…
I ran into another silly error, for which I wanted to share the solution in order to save you some time. It occurs when trying to run a query using Python’s SQLAlchemy libary. Let’s dive right in. The problem When you’re trying to run a query, either by using Pandas’…
In this blog post, we’ll make a treemap in Python using Plotly Express. While this seems like a trivial task, there are some intricacies involved. I ran into multiple error, and I want to make sure you don’t. First, let’s load all relevant packages that you’re gonna need throughout this…
In this article, you’ll learn about keeping a Docker container alive, so that it doesn’t exit. We’ll use Ubuntu as an example. When you use docker run, a process is ran in an isolated container. This means that, when you run an a container with a Ubuntu image, the operating…
Recently, I needed to calculate the relative change of a value compared to the first value within a DataFrame group, a GroupBy object. With SQL, I would use a window function (e.g. PARTITION BY in PostgreSQL). In this article, we’ll do it in Pandas (Python). To demonstrate, let’s start with…