pytype Python
We are going to take a quick look at PyType. We just found out about it and it is a pretty neat tool. PyType is a simple Python package you can add with pip.
It checks and guesses the types used in your code. With other languages like TypeScript, Java, or C Sharp, you tell the language what kind of variable you have, like a string or a number, when you write your code. Python usually doesn't ask for this or enforce it.
PyType helps by looking at your plain Python code and tries to figure out what types you used, even if you did not write any type hints. It reads your code and warns you if you mix things up, like trying to add a string and a number together, which should not work. It does this by looking at how you first create or change a variable.
If you have a variable and set it to a string, PyType remembers that. If you try to do something strange later, like add a number to that string, PyType points it out before you even run your code. Normally, Python will only complain when you try to run the code, which can make bugs hard to find.
PyType is great because it can catch those mistakes early. I tried running a test where I added a string and a number, and PyType caught the problem before running the code, while regular Python only tells you at runtime. PyType can also be included in your CI/CD pipeline to catch type errors before code is merged.
Note that PyType only supports up to Python 3.12 and may not get much more support, since the team is moving on to new ideas, but it still works for now and is useful. Also, I tried changing a variable from one type to another, and PyType did not flag it unless you use stricter settings, so you might want to play with its configuration.
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