Dag Brattli

@dbrattli

Oslo, NorwayJoined December 2021

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Fable Python ▷ F# ♥️ Python. Expression, AsyncRx, RxPY. Works at Cognite. Microsoft alumni. On a quest to bridge the worlds of F# and Python 😅

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Cardamom Codecardamomcode.dev2 posts

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Fable Python

Introduction to Fable.Python Generated on 2026-02-19 06:49 UTC using Fable v5.0.0-alpha.24 This post is part of the F# Advent Calendar 2025. Thank you, Sergey Tihon, for organizing this wonderful tradition that brings the F# community together every...

Dec 21, 202568 min read

cardamomcode.dev

Python Type Annotations (part 3)

Python Type Annotations is a tutorial in 3 parts: Part 1 | Part 2 | Part 3 (this post) Table of contents Variance in Generics Covariance Contravariance Invariance References Variance in Generics Variance in generics refers to how subtyping relati...

Feb 8, 202515 min read

Dag Brattli

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Fable Python

Python Type Annotations (part 3)

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Dag Brattli

About

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Dag Brattli's blogs

Recently published

Fable Python

Python Type Annotations (part 3)