Python is called by instance method name

This article is mainly for you in detail how Python through the instance method name call method, has a certain reference value, interested in small partners can refer to, hope to help everyone.

Case:

In a project, our code uses the graphics classes in 2 different libraries:

Circle,triangle

Each of the two classes has a method interface that gets the area, but the interface has a different name

Requirements:

Unify these interfaces, do not care about the specific interface, as long as I call the Unified interface, the corresponding area will be calculated

How to solve this problem?

Defines a unified interface function that is called by reflection: GetAttr

#!/usr/bin/python3 from Math import pi  class Circle (object):  def __init__ (self, RADIUS):    Self.radius = Radius   def getarea (self):    return round (Pow (Self.radius, 2) * pi, 2)  class Rectangle (object):  def __ Init__ (self, width, height):    self.width = width    self.height = height   def get_area (self):    return Self.width * Self.height  # defines the Unified interface Def func_area (obj):  # Gets the string for the interface for  get_func in [' Get_area ', ' Getarea ']:    # Take the method via reflection    func = GetAttr (obj, Get_func, None)    if func:      return func ()    if __name__ = = ' __main_ _ ':  C1 = Circle (5.0)  r1 = Rectangle (4.0, 5.0)     # Returns an iterative object  Erea = Map (Func_area, [C1, R1]) via the map higher order function: C23/>print (List (Erea))

Call by Methodcaller method in standard library operator

#!/usr/bin/python3 from math import pifrom operator Import Methodcaller class  Circle (object): Def __init__ (self, radius): Self.radius = Radius def getarea (self): return round (POW (Self.radius,       2) * pi, 2) class Rectangle (object): Def __init__ (self, width, height): self.width = width self.height = height def get_area (self): return self.width * self.height if __name__ = = ' __main__ ': C1 = Circle (5.0) r1 = Rectangle (4 .0, 5.0) # The first argument is the function string name, followed by the function required to pass in the arguments, execute parentheses in the incoming object EREA_C1 = Methodcaller (' Getarea ') (c1) Erea_r1 = Methodcaller (' Get_ar EA ') (R1) print (EREA_C1, erea_r1)