print "Hello World!"

>>> t=(1,2,[1,2])
>>> t[2]
[1, 2]

list=[0, 1, 2, 3, 4, 5]
for item in list:
  if item == 1:
    print item
  elif item in (2, 3, 4, 5):
    print "aha " + str(item)
  else:
    pass

def func(var):
   some code here

class MyClass(object):
  common = 1
  def __init__(self):
    self.myvariable = 5
  def myfunction(self, arg1, arg2):
    return self.myvariable

def some_function():
  try:
    # Division by zero raises an exception
    10 / 0
  except ZeroDivisionError:
    print "Oops, invalid."
  else:
    # Exception didn't occur, we're good.
    pass
  finally:
    # This is executed after the code block is run
    # and all exceptions have been handled, even
    # if a new exception is raised while handling.
    print "We're done with that."

import random
from time import clock

yum install python-psycopg2

#get database connect
def get_con():  
  host = '127.0.0.1'
  port = "5432"
  database = 'platform'
  user = 'postgres'
  password = 'postgres'
  conn = psycopg2.connect(database=database, user=user, password=password, host=host, port=port)
  return conn

#执行sql查询
def query(conn, sql):
  cursor = conn.cursor()
  cursor.execute(sql)
  results = cursor.fetchall()
  #close cursor
  cursor.close()
  return results

def getUsers():
  conn = get_con()#open connect
  sql = """select *
     from t_user
     order by intime DESC
     limit 5"""
  items = query(conn , sql)
  print str(items)
  conn.close() #close connect

#发送邮件
def send_email(subject, content):
  sender = "yourmail@***.com"
  password = "******" #密码是看不见的哦
  receivers = [tq8117179#163.com] #本人真实邮箱，欢迎发邮件讨论技术问题
  host = "smtp.exmail.qq.com"
  port = 465
  msg = MIMEText(content,'html','utf-8')
  msg['From'] = sender
  msg['To'] = ",".join(receivers)
  msg['Subject'] = Header(subject, 'utf-8')
  try:
    smtp = smtplib.SMTP_SSL(host, port)
    smtp.login(sender, password)
    smtp.sendmail(sender, receivers, msg.as_string())
  except Exception, e:
    logger.error(e)
  logger.info(content)

# coding=utf-8
import logging
import logging.handlers
logger = logging.getLogger('monitor')
logger.setLevel(logging.DEBUG)
filehandler = logging.handlers.TimedRotatingFileHandler( 
    "/mnt/log/monitor/monitor_log", 'midnight', 1, 7)
# 设置文件后缀名称
filehandler.suffix = "%Y%m%d.log"
formatter = logging.Formatter('%(asctime)s-%(name)s-%(levelname)s: %(message)s')
filehandler.setFormatter(formatter)
logger.addHandler(filehandler)
通过logging.getLogger(‘monitor')生成一个logger，然后配置一个文件处理器。
然后在我们监控程序中引用即可：

from log import logger

config = None
#get config
def getConfig():
  global config
  if config is None:
    config = ConfigParser.ConfigParser()
    config.read("monitor.ini")
  return config

#get database connect
def get_con():  
  host = getConfig().get('db', 'host')
  port = getConfig().get('db', 'port')
  database = getConfig().get('db', 'database')
  user = getConfig().get('db', 'user')
  password = getConfig().get('db', 'password')
  conn = psycopg2.connect(database=database, user=user, password=password, host=host, port=port)
  return conn
#发送邮件
def send_email(subject, content):
  sender = getConfig().get('mail', 'sender')
  password = getConfig().get('mail', 'password')
  receivers = getConfig().get('mail', 'receivers').split(",")
  host = getConfig().get('mail', 'host')
  port = getConfig().getint('mail', 'port')
  msg = MIMEText(content,'html','utf-8')
  msg['From'] = sender
  msg['To'] = ",".join(receivers)
  msg['Subject'] = Header(subject, 'utf-8')
  try:
    smtp = smtplib.SMTP_SSL(host, port)
    smtp.login(sender, password)
    smtp.sendmail(sender, receivers, msg.as_string())
  except:
    logger.exception("Exception: ")
  logger.info(content)

#数据库配置
[db]
host = 127.0.0.1
port = 5432
database = platform
user = postgres
password = postgres
#邮件配置
[mail]
sender = yourmail@XXX.com
password = ******
#多个联系人用英文逗号隔开
receivers = tq8117179#163.com
host = smtp.exmail.qq.com
port = 465

start_time = "2015-10-1 16:24:24"
end_time = None
#update end_time, invoke before get new data
def update_end_time():
  global end_time
  now = time.mktime(datetime.now().timetuple())
  end_time = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(now))
  return end_time
#update end_time, invoke after get new data
def update_start_time():
  global start_time
  global end_time
  start_time = end_time
  return start_time
getUsers可以改写成：

def getUsers (conn):
  global start_time
  global end_time
  sql = """select *
     from t_user
     where intime>=""" +"'"+start_time+"' and intime<"+"'"+end_time+"';"
  items = query(conn, sql)
  if items is not None and len(items)>0:
    count = len(items)
    tip = "又有"+str(count)+"个用户已经注册了。"+end_time
    send_email(tip, tip+"\n"+str(items))

def task():
  #init end_time and start_time, must init end_time first!!!
  end_time = update_end_time()
  start_time = update_start_time()
  #init config
  getConfig()
  while True:
    conn = get_con()   #open connect
    end_time = update_end_time()
    ############## process ##############
    logger.info("query: "+end_time)
    getUsers (conn)
    #do some task else here
    ## end
    update_start_time()
    conn.close()#close connect
    time.sleep(5*60)
  #end of while
def run_monitor():
  monitor = threading.Thread(target=task)
  monitor.start()
if __name__ == "__main__":
  run_monitor()

yum install python-setuptools

 easy_install supervisor

 echo_supervisord_conf > /etc/supervisord.conf

[program:monitor]
command = python /usr/monitor/monitor.py
directory = /usr/monitor
user = root