Jan 17, 2013 · Specifically, the -> marks the return function annotation. Examples: return 1/2*m*v**2. Annotations are dictionaries, so you can do this: kinetic_energy.__annotations__['return']) You can also have a python data structure rather than just a string: 'docstring':'Given mass and velocity returns kinetic energy in Joules'} pass.

The -> (arrow) is used to annotate the return value for a function in Python 3.0 or later. It does not affect the program but is intend to be consumed by other users or libraries as documentation for the function.

In Python, the "->" symbol is used to indicate the return type of a function. It is part of the function definition in a Python 3.5 or later. For example, the following code defines a function add that takes in two arguments, a and b, and returns the sum of the two arguments.

Arrow functions in Python provide a concise and elegant way to write functions for simple operations. They offer benefits such as code readability, a functional programming style, and simplified callback functions.

Mar 4, 2025 · This tutorial explores Python return value annotations using the -> operator, enhancing code readability and maintainability. Learn how to specify expected return types, improve team collaboration, and reduce errors in your Python code.

Jan 19, 2020 · Python doesn’t use arrow notation, like JavaScript — so what is this arrow doing? This, friend, is a return value annotation, which is part of function annotation, and it’s a feature of...

Feb 6, 2019 · I have found the following python function definition: def reverseString(self, s: 'List[str]') -> 'None': I don't quite understand 'List[str]' and -> 'None'. I have found that the arrow is a function annotation but I couldn't find anything useful and understandable for List[str].

Jul 16, 2015 · There is a ->, or dash-greater-than symbol at the end of a python method, and I'm not sure what it means. One might call it an arrow as well. Here is the example: @property def get_foo(self) -> Foo: return self._foo where self._foo is an instance of Foo.

Oct 10, 2024 · Learn everything about the Arrow(->) notation in Python. This guide explains function annotations, type hinting, practical examples, and best practices for improving code clarity.

To add annotations, you use a colon (:) followed by an expression after the parameter name and the return type is annotated with an arrow (->) followed by an expression after the parameter list. These expressions can be any valid Python expressions but are typically used to …