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

Any category Programming7 Python 3 JavaScript 3 TypeScript 1
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 Intermediate 1 Advanced 2
Python Object-Oriented Programming Clear filters 3 results
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Writing a Custom Iterator Class in Python With __iter__ and __next__

A for loop calls iter() once and next() until StopIteration. Write __iter__ and __next__ yourself, avoid the iterator that only works once, and know when a generator in __iter__ does the same job in fewer lines.

6 min read
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Python dataclasses: A Class Without Writing __init__ by Hand

If a class mostly holds data, @dataclass writes __init__, a readable printout and equality for you. Use field(default_factory=list) for lists, __post_init__ for checks and frozen=True for values that must not change.

5 min read
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Writing Your Own Python Context Manager, With a Class or contextlib

Write a context manager when something must be undone no matter how the block ends. Build one as a class and with @contextmanager, keep yield inside try/finally, and don't swallow errors by accident.

5 min read