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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 3
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 3 Advanced 3
Programming Automation and Scripting Intermediate Clear filters 3 results
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Audit Rejected CSV Rows and Reconcile Every Input Record

Validate a defined spreadsheet-export contract, record rejected rows with reasons and line ranges, and reconcile accepted and rejected outputs without changing the source.

7 min read
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Finding Files in Python With pathlib glob and rglob

glob() searches one folder, rglob() searches every folder below it. Neither sorts the results, skips folders like .venv, or matches .CSV on Linux. Add those yourself, and always do a dry run before deleting anything.

6 min read
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Reading a Large Text File in Python Line by Line

for line in file reads one line at a time, so a 10 GB file uses almost no memory. read() and readlines() load everything. Count, filter and stop early without building a list, and read in blocks when there are no lines.

6 min read