python 回调函数

来源：互联网发布：声音剪辑软件编辑：程序博客网时间：2024/05/29 11:13

def apply_async(func, args,  callback):# Compute the result   result = func(*args)# Invoke the callback with the result   callback(result)def print_result(result):   print('Got:', result)def add(x, y):   return x + yapply_async(add, (2, 3), callback=print_result)C:\Python27\python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/cookbook/a22.py('Got:', 5)# !/usr/bin/env python# -*- coding: utf-8 -*-def apply_async(func, args,  callback):# Compute the result   result = func(*args)# Invoke the callback with the result   callback(result)def print_result(result):   print('Got:', result)def add(x, y):   return x + yapply_async(add, (2, 3), callback=print_result)class ResultHandler:   def __init__(self):      self.sequence = 0   def handler(self, result):      self.sequence += 1      print ('[{}] Got: {}'.format(self.sequence, result))##实例化对象r = ResultHandler()##r.handler 调用对象方法apply_async(add, (2, 3), r.handler)C:\Python27\python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/cookbook/a22.py('Got:', 5)[1] Got: 5

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