import socket
import threading
import time

#服务端代码
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('127.0.0.1', 9999))

#开始监听端口，参数表示最大连接数
s.listen(5)     
print("Waiting for connection...")

def tcplink(sock, addr):
     print('Accept new connection from %s:%s...' % addr)
     sock.send(b'Welcome!')
     while True:
          data = sock.recv(1024)
          time.sleep(1)
          if not data or data.decode('utf-8') == 'exit':
               break
          sock.send(('Hello, %s!' % data.decode('utf-8')).encode('utf-8'))
     sock.close()
     print('Connection from %s:%s closed.' % addr)

while True:
     sock, addr = s.accept()
     t = threading.Thread(target=tcplink, args=(sock, addr))
     t.start()

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# 建立连接:
s.connect(('127.0.0.1', 9999))
# 接收欢迎消息:
print(s.recv(1024).decode('utf-8'))
for data in [b'Michael', b'Tracy', b'Sarah']:
     # 发送数据:
     s.send(data)
     print(s.recv(1024).decode('utf-8'))
s.send(b'exit')
s.close()

import socket
import threading
import time

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
# 绑定端口:
s.bind(('127.0.0.1', 9999))

print('Bind UDP on 9999...')
while True:
     # 接收数据:
     data, addr = s.recvfrom(1024)
     print('Received from %s:%s.' % addr)
     s.sendto(b'Hello, %s!' % data, addr)

import socket
import threading
import time

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
for data in [b'Michael', b'Tracy', b'Sarah']:
     # 发送数据:
     s.sendto(data, ('127.0.0.1', 9999))
     # 接收数据:
     print(s.recv(1024).decode('utf-8'))
s.close()

# server.py
# 从wsgiref模块导入:
from wsgiref.simple_server import make_server
# 导入我们自己编写的application函数:
from hello import application

# 创建一个服务器，IP地址为空，端口是8000，处理函数是application:
httpd = make_server('', 8000, application)
print('Serving HTTP on port 8000...')
# 开始监听HTTP请求:
httpd.serve_forever()

# hello.py

def application(environ, start_response):
     start_response('200 OK', [('Content-Type', 'text/html')])
     body = '
Hello, %s!
' % (environ['PATH_INFO'][1:] or 'web')
     return [body.encode('utf-8')]

import web

urls = (
    '/(.*)', 'hello'
)
app = web.application(urls, globals())

class hello:        
    def GET(self, name):
        if not name:
            name = 'World'
        return 'Hello, ' + name + '!'

if __name__ == "__main__":
    app.run()

>>> import re
>>> re.match(r'^\d{3}\-\d{3,8}$', '010-12345')
<_sre.SRE_Match object; span=(0, 9), match='010-12345'>
>>> re.match(r'^\d{3}\-\d{3,8}$', '010 12345')
>>> 

>>> re.split(r'\s+', 'a b c')
['a', 'b', ‘c']

>>> t = '19:05:30'
>>> m = re.match(r'^(0[0-9]|1[0-9]|2[0-3]|[0-9])\:(0[0-9]|1[0-9]|2[0-9]|3[0-9]|4[0-9]|5[0-9]|[0-9])\:(0[0-9]|1[0-9]|2[0-9]|3[0-9]|4[0-9]|5[0-9]|[0-9])$', t)
>>> m.groups()
('19', '05', '30')

from datetime import datetime, timedelta, timezone

# 获取当前时间
now = datetime.now()
print(now)

# 创建一个指定的日期
wt = datetime(2017,4,12,14,5,15)
print(wt)

# 将日期类型转换为时间戳
print( wt.timestamp() )

# 将时间戳转换为日期，加了一个小时
print( datetime.fromtimestamp(wt.timestamp() + 60*60 ) )

# 字符串转换为日期类型
cday = datetime.strptime('2017-4-12 18:19:59', '%Y-%m-%d %H:%M:%S')
print(cday)

# 将日期类型格式化为字符串显示
print(now.strftime('%A, %B, %d, %H:%m'))

# 日期类型也可以直接使用 + - 进行运算，引入timedelta可以计算差值
print(now - timedelta(days=1))
print(now + timedelta(days=1, hours=2))