guide

I think there is no need to say that automatic testing is a must in software development. Tests improve the quality of the code, give confidence in it and make it more stable. However, not all tests are created equal: they differ both in what they test and how hard it is to set them up and maintain. For instance, it is relatively easy to write unit tests. In turn, they tell you very little about how your system will behave in production....

Comprehensions are a quick and easy way to generate sequences (collections) of any kind in Python. In simple cases, they should be easy to write and, more importantly, read. However, when I was making my first steps in Python I tried to avoid comprehensions as much as possible: most of them looked convoluted and not easy at all. Better stick to good old for loop. In time my attitude changed, of course, I just needed to dive deeper to understand syntax and use cases for applying comprehensions....