经常写python，但很多小的点都记不住，每用必查，总结下来，下次查自己的吧。
1.时间获取：
try:
post_map = {}
tags_map = {}
sql_map = {}
sql_map["host"] = "10.218.145.123"
sql_map["user"] = "root"
sql_map["passwd"] = "123456"
sql_map["db"] = "hdploy"
sql_map["port"] = 3306
tags_map["product"] = "search.offline.maindump"
tags_map["sql_connetc"] = sql_map
post_map["metric"] = "deploy.offline.et2main.maindump"
post_map["tags"] = tags_map
new_map = JSONEncoder().encode(post_map)
url = 'http://10.97.212.17:9991'
post_data = urllib.urlencode(post_map)
req = urllib2.Request(url)
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor())
response = opener.open(req, new_map)
result = json.loads(response.read())
for key in result://根据返回的结果进行解析
if "version" in key.keys():
versions = key["version"]
version = versions.split("|")
return version[0][-9:]
except Exception, e:
print e
return 1
3.获取当前文件所在目录：
WORK_HOME = os.path.realpath(sys.path[0])
4.在python中获取执行命令的输出和执行结果：
import commands
(status, output) = commands.getstatusoutput(cmd)
弊端：output只有在cmd命令执行完才能输出
另一种方式：
import os
ret=os.system(cmd)
这种方式可以立即输出cmd的执行输出，但这个输出会输出到终端，无法获取，ret为名利执行的返回值
5.python中访问mysql：
conn = MySQLdb.connect(host= port=3336, user=, passwd=)
cursor = conn.cursor()
cursor.execute(sql)
conn.commit()
conn.close()
print 'Execute SQL[%r] Successed!'%sql
return cursor.fetchall() 返回值为tuple，如果只有一条记录，会返回形如(("",""),)
6.zookeeper操作：
class :
def __init__(self,host):
self.host = host
self.connected = False
self.handle = -1
self.callback_flag = False
self.cv = threading.Condition()
self.connected = False
def connection_watcher(handle, type, state, path):
self.cv.acquire()
self.connected = True
self.cv.notify()
self.cv.release()
self.cv.acquire()
self.handle = zookeeper.init(self.host, connection_watcher)
self.cv.wait(15.0)
self.cv.release()
if not self.connected:
raise Exception("Couldn't connect to host -", self.host)
def __del__(self):
if self.connected:
zookeeper.close(self.handle)
def GetZKValue(zk_host, path)://获取zk路径对应的value
zku = if(zookeeper.exists(zku.handle,path) !=None):
(data,stat) = zookeeper.get(zku.handle, path, None)
return data
else:
return ""
7.更新json格式的文件：
def UpdateConf(conf, key, value): //conf为json格式的文件名，key为要更新的key，value为更新后的值
conf_file = file(conf)
conf_value = json.load(conf_file)
conf_value[key] = value
new_file = open(conf,'w')
new_file.write(json.dumps(conf_value,ensure_ascii=False, indent = 4, separators = (',',':')))
new_file.close()