Summary
No program development without testing! We showed the importance of well organized and documented tests. Some professionals even start development by first specifying tests. A useful tool for automatic testing is the module unittest, which we explained in detail. While testing improves the reliability of a code, profiling is needed to improve the performance. Alternative ways to code may result in large performance differences. We showed how to measure computation time and how to localize bottlenecks in your code.
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