Jan 17, 2013 · As other answers have stated, the -> symbol is used as part of function annotations. In more recent versions of Python >= 3.5, though, it has a defined meaning.

By C89, the notion of a function prototype, which also specifies the types of the parameters (and, implicitly, their number) had been added. Since a prototype is also a type of function …

With private function you can generally ensure it is defined before use, so you can use just auto (from C++14). It is public function that is usually used from places where it is not defined (only …

There are at least several reasons why I (personally) see arrow function use for a purely functional component as pretty bad practice. Here are those: Syntax abuse. When we define …

Feb 6, 2019 · The use of -> None indicates that the function does not have a return statement. List[str] is more interesting: The List part indicates it will return a list type, and its argument [str] …

Sep 1, 2009 · To say that one function is asymptotically less than another, we use small-o notation. The difference between the big-O and small-o notations is analogous to the …

Jan 9, 2020 · There is a new function parameter syntax / to indicate that some function parameters must be specified positionally and cannot be used as keyword arguments. This is …

Oct 21, 2016 · How do I use type hints to annotate a function that returns an Iterable that always yields two values: a bool and a str? The hint Tuple[bool, str] is close, except that it limits the …

ISTM these are theoretical benefits that can only be realized only if the standard library and third-party modules all use function annotations and use them with consistent meaning and use a …

Nov 21, 2020 · I know Python supports object-oriented structure, which uses dot notation. However, I feel confused about the code below where dot notation appears in a function …