生成器yield

import os
def deco(func):
    def wrapper(*args,**kwargs):
        g=func(*args,**kwargs)
        next(g)
        return g
    return wrapper
@deco
def search_file(target):
    while True:
        path=yield
        g=os.walk(path)#g是生成器
        for i in g:
            for file_name in i[-1]:
                file_path=r‘%s\%s‘ %(i[0],file_name)
                target.send(file_path)
@deco
def opener(target):
    while True:
        file_path=yield
        with open(file_path,encoding=‘utf-8‘) as f:
            target.send((file_path,f))

@deco
def reader(target):
    while True:
        file_path,f=yield
        for line in f:
            res=target.send((file_path,line))   #grep.send((file_path,line))
            if res:
                break
@deco
def grep(target,word):
    tag = False
    while True:
        file_path, line = yield tag
        tag = False
        if word in line:
            target.send(file_path)
            tag=True
@deco
def printer():
    while True:
        file_path = yield
        print(file_path)
g=search_file(opener(reader(grep(printer(),‘root‘))))
g.send(r‘E:\PYTHON学习\excises\day9‘)