Typing in Python⚑
In Python typing can be optionally used. To check typing the standard tool is MyPy.
Usage⚑
Function annotations⚑
def func(arg: arg_type, optarg: arg_type = default) -> return_type:
...
For arguments the syntax is argument: annotation, while the return type is annotated using -> annotation. Note that the annotation must be a valid Python expression.
Variable annotations⚑
Sometimes the type checker needs help in figuring out the types of variables as well. The syntax is similar:
pi: float = 3.142
def circumference(radius: float) -> float:
return 2 * pi * radius`