If you want to declare that some methods shouldn’t be overridden by subclasses, use the decorator typing.final.
This method is available for Python 3.8 and above.
typing.final: Declare That a Method Should Not Be Overridden Read More »
When comparing two complicated dictionaries, it is useful to have a tool that finds the differences between the two. Dictdiffer allows you to do exactly that.
Dictdiffer: Find the Differences Between Two Dictionaries Read More »
If you want to add metadata to your typehint such as units of measurement, use typing.Annotated.
Annotated[T, x] allows static typechecking such as mypy to check T while safely ignoring x.
This method is available for Python 3.9 and above.
If you want to get the parent path or the grandparent path in Python easily, use pathlib’s .parent.
If you want to apply a function of two arguments cumulatively to the items of iterable from left to right, use functools’s reduce. This method reduces the iterable to a single value.
In the code below, 3 is the result of the function add_nums(2, 1). 3 is then used as the first argument of the function add_nums(3, 2).
functools.reduce: Apply Function Cumulatively to the Items of Iterable Read More »
If you want to get the path to folders/files from the home directory, use Path.home() from pathlib.
If you want to get objects from a list that match a certain pattern, use pydash‘s filter.
In the code above, I use filter to get a dictionary whose name is apple.
With a data class, you don’t need an init method to assign values to its attributes. However, sometimes you might want to use an init method to initialize certain attributes.
That is when dataclass’s __post_init__ comes in handy.
In the code above, I use __post_init__ to initialize the attribute info using the attributes names and ages.
If you want to create new directories and files, you can either use os or pathlib. However, pathlib’s syntax is more straightforward and easier to understand than os’s syntax.
Normally, you need to implement the __eq__ method so that you can compare between two classes. dataclasses automatically implements the __eq__ method for you.
With dataclasses, you can compare between 2 classes by only specifying their attributes.