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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 Programming2 Python 2
Any topics APIs and Integrations 5 Automation and Scripting 3 Data Structures and Algorithms 4 Databases 11 Object-Oriented Programming 4 Packaging and Dependencies 9 Performance Optimization 2 Programming Basics 2 Programming Patterns 2 Testing and Debugging 11 Type Systems 11 Web Development 12
Any level Intermediate 2 Advanced 10
Programming Programming Patterns Intermediate Clear filters 2 results
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Python Dictionary Comprehensions: When They Help and When They Hurt

A dictionary comprehension builds a dictionary in one line. Good for transforming, filtering and building lookups. Bad for nested logic, side effects and anything that needs error handling. Shorter code is not always better code.

5 min read
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Python if __name__ == "__main__": What It Does and When You Need It

Importing a file runs it. if __name__ == "__main__" keeps a file's script part from running when another file imports it. Use it with a main() function, and know the cases where you don't need it.

4 min read