typing VS learn-go-with-tests

Iterable[str] is unfortunately evil as it matches str which is often unintended. (see: https://github.com/python/typing/issues/256) One would need both NOT-type and AND-type in order to properly handle these.

The basic motivation behind them is that functions can have arguments that can only take a specific set of values, and those functions return values/types change based on that input. Common examples are (you can find more here):

While yes 26 people liked the idea here: https://github.com/python/typing/issues/193

but looking at relevant issues on GitHub it seems this has been shot down repeatedly. python/typing#18, python/typing#213

See https://github.com/python/typing/issues/256 for a discussion.

Lower bounds are not supported for TypeVars, unfortunately.

Mypy allows that because initial versions of PEP-484 allowed that. This has changed; here's the current wording on the PEP:

> This is no longer the recommended behavior. Type checkers should move towards requiring the optional type to be made explicit.

https://www.python.org/dev/peps/pep-0484/#id29

Dunno, other, larger projects than the one I'm working on seem to run up against this from time to time. (rasa_core, to pick one example from near the top of a Google search; also Telethon, Blender, TensorFlow, Pandas. Guido also filed a bug on the typing module in an early version of Python 3.5 because of unexpected implications of this particular issue, so the problem isn't exactly purely theoretical.) That's aside from the wish for conceptual purity in the call signatures of classes and their subclasses, which is not always and automatically a bad wish to have; and the notion that a language that prides itself on its introspective faculties might want to make introspection of classes from the top of a class hierarchy possible, at least in theory? Perhaps to facility learning about the language and/or visualizing large class hierarchies easily, for instance?

There are not particularly bad parts. Overall the book is well written and organized. Moreover, Since it is also an open-source material, many readers have contributed to the contents of the book(including a few of mine :)). I hope there are more books like this for other languages such as Rust or Python.

i.e using this free open source book Learn Gol with Tests

I really like Learn Go with tests. Not only is it a neat resource for learning Go, but it's great for getting a feeling for TDD.

You can try viewing it on github instead https://github.com/quii/learn-go-with-tests/blob/main/scaling-acceptance-tests.md

If you already know php and want to get professional in go, i suggest you take a look at https://github.com/quii/learn-go-with-tests

Learn some TDD: https://github.com/quii/learn-go-with-tests

Hi, author here.

The project is open-source (https://github.com/quii/learn-go-with-tests) so there's a few options available to you.

In releases, you'll find PDFs and epubs, I'm pretty sure most epub readers will let you use a dark mode. Or you can just read the markdown files on GitHub, which also supports it.