Mojo Miji - A Guide to Mojo Programming Language from A Pythonista's Perspective

by Yuhao Zhu 朱宇浩

Compatible Mojo version

This Miji is compatible with Mojo v25.3 (2025-05-06) and is working towards compatibility with Mojo v25.4 (2025-06-18).

Table of Contents

• INTRODUCTION
• PART I: START WITH MOJO
  • Install pixi and extension (Install package manager and VS Code extension)
  • Initiate Mojo project (Initiate a Mojo project and install Mojo compiler)
  • My first Mojo program (Hello, world!)
• PART II: MOVE INTO MOJO
  • Convert Python code into Mojo (Four examples, Python becomes Mojo)
  • Things that are in common (Similarities between Python and Mojo)
  • Things are different (Differences between Python and Mojo)
• PART III: BASIC MOJO
  • Variables (Declare and use variables in Mojo)
  • Functions (Define and use functions in Mojo)
  • Data types - basic (Fundamental building blocks of Mojo)
  • Data type - string (String in Mojo, similar to str in Python)
  • Operators and assignment (Operators and assignment expressions)
  • Control flows (Loops, conditionals, and some about iterables)
  • Structs (Structs in Mojo, similar to classes in Python)
• PART IV: ADVANCED MOJO
  • Data type - SIMD (The first-class SIMD type)
  • Parameterization (Shift work from run time to compile time)
  • Generic and traits (Move to generic programming with traits)
  • Ownership (The ownership system in Mojo)
  • References (The reference system in Mojo)
  • Lifetime (The lifetime system in Mojo)
• PART V: APPLY MOJO (Let's use Mojo to program something useful)
  • Design of MatMojo library (Some preparation work for writing a matrix library)
  • Make it work (Define and implement the basic functionalities)
• PART VI: EXTEND MOJO
  • Arbitrary-precision numbers (A library for arbitrary-precision integers and decimals)
  • Multi-dimensional arrays (A library for numerical computing and NDArray)
• PART VII: MISCELLANEOUS
  • Glossary of Mojo terms (Find explanations of key terms and concepts)
  • Tips and warnings (Do not fall into the pits I fell into)
  • Useful resources and links (Online resources and links related to Mojo)
  • Wishes for extra features (Some features I wish Mojo could have)
  • About the author (A brief introduction of the author)