1、with实现上下文管理

#！/usr/bin/env python
# -*- coding: utf-8 -*-
# Author: wanghuafeng


#with实现上下文管理
import contextlib
@contextlib.contextmanager
def worker_state(self, state_list, worker_thread):
    """
    用于记录线程中正在等待的线程数
    :param self:
    :param state_list:
    :param worker_thread:
    :return:
    """
    #第二步
    state_list.append(worker_thread)
    try:
        #第三步
        yield
    finally:
        #执行第五步
        state_list.remove(worker_thread)

free_list = []
current_thread = "wang"
#第一步执行with，调用worker_state方法
with worker_state(free_list, current_thread):
    #第四步
    print(123)
    print(456)
    #执行完成出去的瞬间

2、with实现socket上下文

#！/usr/bin/env python
# -*- coding: utf-8 -*-
# Author: wanghuafeng


import contextlib
import socket

@contextlib.contextmanager
def context_socket(host, port):
    sk = socket.socket()
    sk.bind((host, port))
    sk.listen(5)
    try:
        yield sk
    finally:
        sk.close()

with context_socket(‘127.0.0.1‘, 8888) as sock:
    print(sock)

3、Redis连接池

import redis
pool = redis.ConnectionPool(host=‘192.168.195.128‘, port=6379)
r = redis.Redis(connection_pool=pool)
pipe = r.pipeline(transaction=True)
r.set(‘name‘, ‘wanghuafeng‘)
r.set(‘role‘, ‘haha‘)
t = pipe.execute()
print(r.get(‘role‘))

4、Redis发布、订阅

import redis

class RedisHelper:
    def __init__(self):
        self.__conn = redis.Redis(host=‘192.168.195.128‘)
        self.chan_sub = ‘FM98.8‘
        self.chan_pub = ‘FM98.8‘

    def public(self, msg):
        self.__conn.publish(self.chan_pub, msg)
        return True

    def subscribe(self):
        pub = self.__conn.pubsub()
        pub.subscribe(self.chan_sub)
        pub.parse_response()
        return pub

#！/usr/bin/env python
# -*- coding: utf-8 -*-
# Author: wanghuafeng


from monitor.s22 import RedisHelper

obj = RedisHelper()
redis_sub = obj.subscribe()

while True:
    msg = redis_sub.parse_response()
    print(msg)

#！/usr/bin/env python
# -*- coding: utf-8 -*-
# Author: wanghuafeng


from monitor.s22 import RedisHelper

obj = RedisHelper()
obj.public(‘helo‘)

5、RabbitMQ

#！/usr/bin/env python
# -*- coding: utf-8 -*-
# Author: wanghuafeng

import pika

# ######################### 生产者 #########################

connection = pika.BlockingConnection(pika.ConnectionParameters(
    host=‘localhost‘))
channel = connection.channel()

channel.queue_declare(queue=‘hello‘)

channel.basic_publish(exchange=‘‘,
                      routing_key=‘hello‘,
                      body=‘Hello World!‘)
print(" [x] Sent ‘Hello World!‘")
connection.close()

#！/usr/bin/env python
# -*- coding: utf-8 -*-
# Author: wanghuafeng


import pika

# ########################## 消费者 ##########################

connection = pika.BlockingConnection(pika.ConnectionParameters(
    host=‘localhost‘))
channel = connection.channel()

channel.queue_declare(queue=‘hello‘)


def callback(ch, method, properties, body):
    print(" [x] Received %r" % body)


channel.basic_consume(callback,
                      queue=‘hello‘,
                      no_ack=True)

print(‘ [*] Waiting for messages. To exit press CTRL+C‘)
channel.start_consuming()

Day12 线程池、RabbitMQ和SQLAlchemy