Python on Omar H.Ajmi | Python, Java, Terraform & DevOps TILs

🐍 Python 3.15: Lazy Imports Without Hiding Them Inside Functions

Thu, 29 Oct 2026 00:00:00 +0000

🐍 Python 3.15: Lazy Imports Without Hiding Them Inside Functions

Ever opened a Python CLI tool that takes several seconds to start, even though you only want to display its help message?

Sometimes, the application is busy loading modules it won’t actually use.

Python 3.15 introduces a new option: explicit lazy imports. Instead of loading a module immediately, Python can wait until you first use the imported name.

The interesting part? Your imports can stay at the top of the file.

🐍 Python: `is` vs. `==` — Same Value, Different Object

Mon, 05 Oct 2026 00:00:00 +0000

🐍 Python: `is` vs. `==` — Same Value, Different Object

Two lists contain exactly the same elements. You compare them, and Python says they’re equal.

Then you use is, and Python says they’re different.

Is Python contradicting itself? Nope. You’re asking two different questions.

🐍 Python dataclasses: the list that wanted roommates

Sat, 12 Sep 2026 00:00:00 +0000

🐍 Python dataclasses: the list that wanted roommates

You create two objects. You update the list in one. Somehow, the other object knows about it.

Congratulations: your objects are sharing. Unfortunately, nobody asked them to.

🧠 The tiny trap

Python’s ordinary class attributes can be shared between instances. Dataclasses protect against many mutable-default mistakes by rejecting unhashable defaults, including a plain list, in current Python versions.

🐍 Python: The Mutable Default Argument Trap

Wed, 03 Jun 2026 00:00:00 +0000

🐍 Python: The Mutable Default Argument Trap

You write a function that collects items into a list. The first call works perfectly. The second call mysteriously contains items from the first.

No global variable. No database. No spooky background thread.

Just a Python default argument doing exactly what it was designed to do.

🐍 Python 3.14: t-Strings Look Like f-Strings, But They Aren't Strings

Tue, 21 Oct 2025 00:00:00 +0000

🐍 Python 3.14: t-Strings Look Like f-Strings, But They Aren’t Strings

An f-string takes your variables and glues them into a string immediately. That’s lovely for greetings and terrible for SQL, HTML and shell commands, where “just glue it” is how injection bugs are born.

Python on Omar H.Ajmi | Python, Java, Terraform & DevOps TILs

🐍 Python 3.15: Lazy Imports Without Hiding Them Inside Functions

🐍 Python 3.15: Lazy Imports Without Hiding Them Inside Functions

🐍 Python: `is` vs. `==` — Same Value, Different Object

🐍 Python: is vs. == — Same Value, Different Object

🐍 Python dataclasses: the list that wanted roommates

🐍 Python dataclasses: the list that wanted roommates

🧠 The tiny trap

🐍 Python: The Mutable Default Argument Trap

🐍 Python: The Mutable Default Argument Trap

🐍 Python 3.14: t-Strings Look Like f-Strings, But They Aren't Strings

🐍 Python 3.14: t-Strings Look Like f-Strings, But They Aren’t Strings

🐍 Python: `is` vs. `==` — Same Value, Different Object