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一些常用表达式

• OS=$(uname -s) # Darwin
• ARCH=$(uname -m) # x86_64
• if是检测commad执行的返回情况，正常(exit code为0)则True

if command; #等价于 command;if [$? -eq 0]
then 
  .... 
else 

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文档元数据

索引(_index/index)

• 文档存在哪里

类型(_type/type)

• 文档表示的对象类别

id(_id)

• 文档唯一标识

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select with update 问题

• 同一个进程对表的同一行select with update是没有问题的
• 不同进程对表的同一行select with update是会造成lock transaction。要等其中一方commit。
• idle in transaction，如果开启了一个空闲的事务，会有一个超时时间，postgres会断开这个transaction。解决方法是try catch掉，重新commit

数人数，里面可能有重复的

z_uid	c_uid
1	a
1	b

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class Watcher:
    def __init__(self):
        self.child = os.fork()
        print 'child', self.child
        if self.child == 0:
            return
        self.watch()

    def watch(self):

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import signal

def handle_hup(sig, frame):
    print "get signal: %s"%sig

signal.signal(signal.SIGHUP, handle_hup)

if __name__ == '__main__':

    ign = signal.SIG_IGN

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# coding=utf-8
import os, logging
import random

import signal

import time

import sys

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_filename_gbk_strip_re = re.compile(u"^[\u4e00-\u9fa5A-Za-z0-9_.-]+$")


def secure_filename(filename):
    if isinstance(filename, text_type):
        from unicodedata import normalize
        filename = normalize('NFKD', filename).encode('utf-8', 'ignore')
        if not PY2:
            filename = filename.decode('utf-8')
    for sep in os.path.sep, os.path.altsep:

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from urllib import urlencode
from urlparse import urlparse, urlunparse, parse_qsl

url = 'https://www.baidu.com?fuxk=true&m=1'
url_parts = list(urlparse(url))
query = dict(parse_qsl(url_parts[4]))
query.update({'nimabi': 1111})
url_parts[4] = urlencode(query)
print urlunparse(url_parts)

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def full_permutation(arr, cursor):
    if cursor == len(arr) - 1:
        print arr
        return

    for i in range(cursor, len(arr)):
        arr[cursor], arr[i] = arr[i], arr[cursor]
        full_permutation(arr, cursor + 1)
        arr[cursor], arr[i] = arr[i], arr[cursor]

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def ngetmprint(list, ans, m):
    if m == len(list):
        ans = ans + list
        print ans
    elif m == 0:
        print ans
    else:
        ngetmprint(list[1:], ans + list[0:1], m - 1)
        ngetmprint(list[1:], ans, m)