Jan 17, 2013 · 744 It's a function annotation. In more detail, Python 2.x has docstrings, which allow you to attach a metadata string to various types of object. This is amazingly handy, so Python 3 extends …

Sep 5, 2015 · The same is true of the arguments in the function you've provided. This means that the order of the arguments in a function call is important. The Python language, like many others, …

Feb 6, 2019 · The python interpreter does not do anything with this information in terms type checking, however the mypy interpreter will typecheck your code. For more information see PEP 484 and the …

Nov 23, 2013 · return x+2 function(5) In python, indentations are important. They are the {} of the python world. You actually do not need to add extra whitespace before function(5) because python knows …

Aug 31, 2008 · In a function call the '*' unpacks data structure of tuple or list into positional or keyword arguments to be received by function definition. In a function call the '**' unpacks data structure of …

202 While I am aware of the duck-typing concept of Python, I sometimes struggle with the type of arguments of functions, or the type of the return value of the function. Now, if I wrote the function …

Decorators were added in Python to make (a function that receives a function and returns an enhanced one) easier to read and understand. The original use case was to be able to define the methods as …

Jan 9, 2020 · The function parameter syntax (/) is to indicate that some function parameters must be specified positionally and cannot be used as keyword arguments. (This is new in Python 3.8) …

Jun 28, 2018 · "Essentially, this lets Python know that you are done defining your function." If you don't have the extra line, Python assumes you are still writing part of the function.

Jan 1, 2021 · Just tried your function definition in Python 3.7 and it works, no problem. I think you should double-check your environnement, you could be using a different version of Python unknowingly.