Recently when I was looking at the source code of Elastic APM agent for Python, I saw that the developers of the project have used the atexit module to close the metrics collect timer before the APM agent shuts down.
Since I am not very familiar with atexit, I decided to study it in this article.
Last updated on Feb 20, 2023 in Python Programming - Beginner Level by Amo Chen ‐ 3 min read
This article records several SQLAlchemy methods that achieve the same effect as SELECT DISTINCT.
Posted on Jul 12, 2019 in Python Module Recommendations by Amo Chen ‐ 2 min read
This article is part of a tutorial series:
In the last article, we introduced some key syntax and features of proto3 with Google Protocol Buffers. This time, we’ll delve into how to write more complex messages, and introduce some convenient data types along with how to use them.
Posted on Nov 9, 2018 in Python Programming - Advanced Level by Amo Chen ‐ 5 min read
This post is part of a tutorial series:
In the previous post, we introduced the basics of using Google Protocol Buffers (proto3) with Python. In this post, we’ll delve further into some key syntax and features of proto3.
Posted on Nov 3, 2018 in Python Programming - Advanced Level by Amo Chen ‐ 4 min read
This article is part of a series:
The blog post What I Learned from Quip on How to Build a Product on 8 Different Platforms with Only 13 Engineers explains how Quip managed to build products for 8 different platforms with only a 13-member team. It’s definitely something worth learning from.
A key concept from the post is Build once, use multiple times. It encourages minimizing the repetition of creating the same components, thereby increasing the reusability of components. The article also reveals that Quip heavily uses Google Protocol Buffers. By defining data structures using Google Protocol Buffers, automatic code generation can occur for reading and writing the same data structure across various languages or platforms. It can even act as a data exchange format to transfer between different platforms, reducing repetitive development costs and thus improving development efficiency.
With such a handy tool, let’s learn Google Protocol Buffers using Python!
Posted on Oct 27, 2018 in Python Programming - Advanced Level by Amo Chen ‐ 5 min read
This post is part of a series on the Python module - jsonschema:
In Part 2 of the Python Module - jsonschema, we covered the complex usage of types like number, string, array, and object. However, most examples focused on validating individual data types, while in practice, JSON data can often involve a mixture of multiple data types. For example, an array might contain object elements, and an object might include nested objects. Consider the following JSON data:
[
{
"user_id": 1,
"preference": {
"cooking": True,
"fishing": False,
}
},
{
"user_id": 1,
"preference": {
"cooking": True,
"fishing": False,
}
},
]
This section will introduce how to write JSON Schemas that are more practical for real-world use and easier to maintain.
Posted on Mar 28, 2018 in Python Module Recommendations by Amo Chen ‐ 4 min read
This article is a part of a series on the Python module - jsonschema:
In the previous article, Python Module - jsonschema Part 1, we introduced six data types defined by JSON Schema and covered some basic validation techniques.
In this post, we will dive deeper into more complex usages of several types, namely number, string, array, and object.
Posted on Mar 23, 2018 in Python Module Recommendations by Amo Chen ‐ 6 min read
This article is part of a tutorial series about the Python module - jsonschema:
JSON is currently one of the mainstream data interchange formats. However, if you want to validate the format of JSON data in your program, you’ll need to spend some effort writing validation code. Fortunately, JSON Schema simplifies the process of validating JSON formats. If you’re using JSON as the data exchange format for an API, you might consider using JSON Schema for validation.
JSON Schema is a vocabulary that allows you to annotate and validate JSON documents.
Posted on Mar 20, 2018 in Python Module Recommendations by Amo Chen ‐ 5 min read