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Programming tutorials for people who want code that actually runs, not code that only looks right. Pick a language, start at the beginning, and don't skip the basics. They are where most problems come from.

Any category Programming3 Python 2 JavaScript 1
Any topics APIs and Integrations 7 Automation and Scripting 3 Data Structures and Algorithms 2 Databases 11 Deployment and Containers 3 Object-Oriented Programming 3 Packaging and Dependencies 5 Performance Optimization 21 Programming Patterns 10 Testing and Debugging 9 Type Systems 14 Web Development 15
Any level Intermediate 4 Advanced 3
Programming Object-Oriented Programming Advanced 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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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
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Fix a Bound Event Listener That Will Not Detach

Trace a wrong callback receiver, bind one stable listener, and verify start, stop and restart without duplicate or stale subscriptions.

6 min read