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Python from your first script to code you can maintain. Start here if you have never programmed.

Any category Programming35 Python 2 JavaScript 1 TypeScript 32
Any topics APIs and Integrations 2 Automation and Scripting 5 Data Structures and Algorithms 2 Object-Oriented Programming 3 Packaging and Dependencies 6 Performance Optimization 5 Programming Basics 8 Programming Patterns 7 Testing and Debugging 7 Type Systems 2
Any level Advanced 2
Python Type Systems Clear filters 2 results
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Python Type Hints: Catch Bugs Before Your Users Do

Python ignores type hints when it runs. A checker like mypy doesn't. See one file crash on its first bug, then see mypy find both bugs before anything runs, and learn where to start adding hints in an existing project.

6 min read
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Adding mypy to an Existing Python Project Without 500 Errors on Day One

Start mypy with its defaults, fix what it finds, turn on check_untyped_defs, then make one module at a time strict. Every function you annotate checks every place that calls it, so start with the busiest ones.

6 min read