python协成与面向过程编程

初步了解协程

def eater():
    print('start to eat')
    while True:
        food=yield
        print('is eating food:%s'%food)

def producer():
    dog=eater()
    next(dog) # 先next一次唤醒协程函数
    #然后下面的操作都是dog.send（值）
    food1='黄瓜'
    food2='茄子'
    dog.send(food1)
    dog.send(food2)
producer()

输出结果：
start to eat
is eating food:黄瓜
is eating food:茄子

面向过程编程

#实现grep -rl 'python' /root/

import os

import functools
def init(func):
    @functools.wraps(func) #让warpper的帮助信息同eater相同
    def warpper(*args,**kwargs):
        '我是warpper函数'
        g=func(*args,**kwargs)
        next(g)
        return g
    return warpper

#面向过程的编程
#扩展性差
def get_file(abs_path,target):
    '''
    生产一个个文件
    :param abs_path:传进来的决对路径
    :param target: 下一个目标
    :return: 返回绝对文件的路径
    '''
    g=os.walk(abs_path)
    for top_dir,current_dir,files in g:
        for file in files:
            abs_file_path=r'%s\%s' %(top_dir,file)
            target.send(abs_file_path)

@init
def opener(target):
    '''
    打开文件
    :return: 返回句柄
    :param target 下一个目标
    '''
    while True:
        abs_file_path=yield
        with open(abs_file_path) as f:
            target.send((f,abs_file_path))

@init
def get_lines(target):
    '''
    读取每一行的内容
    :param target: 下一个目标
    :return:返回每一行的内容
    '''
    while True:
        f,abs_file_path=yield
        for line in f:
            target.send((line,abs_file_path))

@init
def grep(pattern,target):
    '''
    过滤关键字
    :param pattern:匹配关键字 
    :param target: 下一个目标
    :return: 返回文件
    '''
    while True:
        line,abs_file_path=yield
        if pattern in line:
            target.send(abs_file_path)

@init
def printer():
    '''
     打印功能
    :return:输出信息 
    '''
    while True:
        abs_file_path=yield
        print(abs_file_path)


get_file(r'D:\test',opener(get_lines(grep('zzl',printer()))))