Language Features

Go 03 Sep 2026 10 min read

Use defer for Reliable Cleanup in Go

Resource cleanup is easy to get right on the happy path and easy to miss on an early return. A function opens a file, acquires a lock, or starts a trace span; a later check fails; the function returns before reaching the cleanup statement. Go’s defer statement addresses this by scheduling a function call to run when the surrounding function returns. Used well, it places cleanup next to acquisition and makes every return path easier to reason about.

Golang Language Features

Go 03 Sep 2026 12 min read

Understand Nil Interface Values in Go

A Go program can print an error that looks empty, enter an if err != nil branch, and still be holding a nil pointer underneath. This behavior surprises developers because it seems to violate the simple rule that “nil means no value.” The rule is still consistent. The missing piece is that an interface value has two parts: a dynamic type and a dynamic value. An interface is nil only when neither part is set.

Golang Language Features

Python 03 Sep 2026 9 min read

Design Managed Attributes in Python with property

Python code often starts with plain public attributes. That is usually a good default: order.total is simpler than a pair of trivial getter and setter methods when reading and writing the value needs no extra behavior. Requirements can change. A value may need validation, an attribute may become computed, or an existing public field may need to keep its interface while its internal representation changes. Python’s built-in property type lets a class place method logic behind normal attribute access.

Python Object-Oriented Programming