Mypy Primer
What is mypy, and how can I use it?
What is mypy?
Introduction to Python's type annotation syntax
Installing mypy on your machine, and in your code editor
Using mypy to type-check your code
We'll see what kind of errors mypy will throw at you, how to configure mypy to make the best use of it, and try to figure out what its errors mean.
Why doesn't mypy show an error here?
Mypy configuration
Simple type checking examples
Using reveal_type() to debug types
Modern Python has a LOT of type checking features baked into it. In this chapter we will see a glimpse of what the typing module has to offer.
Lists, Dictionaries, and other collections
Union and Optional types
Reading mypy error messages
Type checking your classes
Typing *args and **kwargs
The "Any" type
The typing module also provides various functions and base classes, that create the basis of a lot of concepts of mypy's type system. In this chapter we will dive deep into these functionalities.
Static duck typing
Custom Generic types
The NamedTuple class
The TypedDict class
Function overloading with @overload
In this chapter we will learn some concepts, tips and tricks on how to properly type-check code using some of the more complicated Python concepts.
Type checking decorators
Type checking generators
The Type type
In this chapter, we will wrap up the series, and understand where type checking sits in the ecosystem of Python, and your software development process.
Type checking, or writing tests? Why not both!
Integrating mypy into your software development lifecycle
All Courses Mypy Primer Why doesn't mypy show an error here?
Why doesn't mypy show an error here?
Tushar Sadhwani
Nov 1, 2021
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