Python Library, Multiple Dispatch – EyeVision

About

Python’s multipledispatch is a library for dynamically dispatching (selecting) functions based on multiple argument types, allowing you to define functions with the same name for multiple types and automatically switch between them.

Installation

pip install multipledispatch

Usage

Register functions using Decorator

from multipledispatch import dispatch

# a function recieve int type
@dispatch(int)
def greet(value):
    print(f"Hello, you passed an integer: {value}")

# a function recieve str type
@dispatch(str)
def greet(value):
    print(f"Hello, you passed a string: '{value}'")

greet(1234)    # 出力: Hello, you passed an integer: 1234
greet("Hello World")  # 出力: Hello, you passed a string: 'Hello World'

Register several functions using Dispatcher Object from multpledispatch

from multipledispatch import Dispatcher

area_calculator = Dispatcher("area_calculator")

# register function with types
@area_calculator.register(int, int)
def rectangle_area(width, height):
    return width * height

@area_calculator.register(float)
def circle_area(radius):
    import math
    return math.pi * radius ** 2

# calling
print(area_calculator(4, 5))
print(area_calculator(3.0))