Static and dynamic typing

Whether a program's types are checked before it runs, by a compiler or a type checker, or only as each line runs, as Python does.

Depth 1 · Foundation

You know that Python checks types only when each line runs, so a mistake in a branch that never ran can wait for months, while a static checker such as mypy reads every line before anything runs; and you use `isinstance` to check data that arrives from outside.

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1
Foundation
You know that Python checks types only when each line runs, so a mistake in a branch that never ran can wait for months, while a static checker such as mypy reads every line before anything runs; and you use `isinstance` to check data that arrives from outside.
Opens after
Type annotationsA static checker for Python works by comparing every call with the annotations you wrote.

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Static and dynamic typingWriting Correct Code

Builds onThis conceptType annotations Static and dynamic typingWriting Correct Code