python
# 加减乘除
>>> (3 + 2) - 5 * 1
5
# 位运算
>>> 3 << 2
12
# x ^ y 幂次方运算,不能开方运算
>>> 3 ** 2
9
# 用另一种计算幂次方的运算，可以开方运算
>>> pow(9, 0.5)
3.0
# 作进制转换，如二进制转换，十进制转n进制
>>> bin(2)
'0b10'
>>> hex(25)
'0x19'
>>> oct(10)
'012'
>>> int('e0', 16)
224
# 将十进制转换为二进制，以全0占位形式显示二进制，更方便查看,默认为32位，使用如下图所示
def decbin(i, bit=32):return (bin(((1 << bit) - 1) & i)[2:]).zfill(bit)

#!/usr/bin/python
# -*- coding: UTF-8 -*-import urllib,urllib2
import re
import os
import HTMLParser
dirbase = '/tmp'
urlbase = 'http://hg.openjdk.java.net'
url= urlbase + '/jdk8u/jdk8u/jdk/file/dddb1b026323/src'        #/jdk,/hotspot
skip_to_p = ''
skip_find = False;
textmod ={'user':'admin','password':'admin'}
textmod = urllib.urlencode(textmod)
print(url)
req = urllib2.Request(url = '%s%s%s' % (url,'?',textmod))
res = urllib2.urlopen(req)
res = res.read()
alink = re.findall(r'<a',res)
allflist = []table=re.findall(r'<tbody class="stripes2">(.+)<\/tbody>',res, re.S)harr = re.findall(r'href="(/jdk8u[\w\/\._]+)">(?!\[up\])', table[0])def down_src_recursion(harr):global allflist,skip_find;if(not harr):return False;i=0; arrlen = len(harr)lock_conflict_jump_max = 2;   # 遇到文件锁时跳过n个文件,当前仍需跳过的文件数量lock_conflict_jumping = 0;print("in new dir cur...")if(len(allflist) > 1500):print('over 1500, cut to 50 exists...')allflist = allflist[-800:]for alink in harr:i += 1;alink = alink.rstrip('/')if(skip_to_p and not skip_find):if(alink != skip_to_p):print('skip file, cause no find..., skip=%s,now=%s' % (skip_to_p, alink))continue;else:skip_find = True;if(alink in allflist):print('目录已搜寻过:' + alink)continue;pa = dirbase + alinkif(os.path.isfile(pa)):print('文件已存在，无需下载: ' + pa)continue;lockfile=pa+'.tmp'if(os.path.isfile(lockfile)):lock_conflict_jumping = lock_conflict_jump_max;print('文件正在下载中，跳过+%s...: %s' % (lock_conflict_jumping, lockfile))continue; else:if(lock_conflict_jumping > 0):lock_conflict_jumping -= 1;print('文件正在下载中，跳过+%s...: %s' % (lock_conflict_jumping, lockfile))continue;# 首先根据后缀把下载中的标识标记好，因为网络下载时间更慢，等下载好后再加标识其实已为时已晚if(pa.endswith(('.gif','.jpg','.png', '.xml', '.cfg', '.properties', '.make', '.sh', '.bat', '.html', '.c','.cpp', '.h', '.hpp', '.java', '.1'))):os.mknod(lockfile);reqt = urllib2.Request(urlbase + alink)rest = urllib2.urlopen(reqt)rest = rest.read()allflist.append(alink)if(rest.find('class="sourcefirst"') > 0):print('这是个资源文件:%s         %d/%d' % (alink, i, arrlen))if(not os.path.isfile(lockfile)):os.mknod(lockfile);filename = alink.split('/')[-1]linearr = re.findall(r'<span id=".+">(.+)</span>', rest)fileObject = open(dirbase + alink, 'w')for line in linearr:try:line = HTMLParser.HTMLParser().unescape(line)except UnicodeDecodeError as e:print('oops, ascii convert error accour:', e)fileObject.write(line + '\r\n')fileObject.close()os.remove(lockfile); else:print('这是目录:%s        %d/%d' % (alink, i, arrlen))if(not os.path.exists(pa)):print('创建目录:%s' % alink)os.makedirs('/tmp' + alink, mode=0777)ta=re.findall(r'<tbody class="stripes2">(.+)<\/tbody>',rest, re.S)ha = re.findall(r'href="(/jdk8u[\w\/\._]+)">(?!\[up\])', ta[0])down_src_recursion(ha)# go...
down_src_recursion(harr);

# 做简单字符查找验证
>>> '234234fdgdfs'.find('f')
6
>>> '234234fdgdfs'.index('f')
6
>>> '234234fdgdfs'[2:5]
'423'
# 做正则匹配
>>> re.findall(r'[a-zA-Z0-9]*\.[a-zA-Z1-9]*[\.|com]*', 'www.baidu.com')
['www.baidu.com']

#!/usr/bin/env python
#!coding=utf-8
import os
import time
import sys
import smtplib
from email.mime.text import MIMETextdef send_email (warning):msg = MIMEText(warning)msg['Subject'] = 'python send warning mail'msg['From'] = '测试了<rootrr@163.com>'try:smtp = smtplib.SMTP()to_mail = 'xx@163.com'from_mail = 'xx@163.com'smtp.connect(r'smtp.qiye.163.com')smtp.login('xx@163.com', 'xxx123')smtp.sendmail(from_mail, to_mail, msg.as_string())smtp.close()print('send mail to %s, content is: %s' % (to_mail, msg))except Exception as e:print("Send mail Error: %s" % e)
# 监听状态中。。。
while True:http_status = os.popen('netstat -tulnp | grep ":8080"','r').readlines()try:if http_status == []:os.system('service tomcat7 start')time.sleep(3)    # 等待启动new_http_status = os.popen('netstat -tulnp | grep ":8080"','r').readlines()str1 = ''.join(new_http_status)is_port = -1;send_email(warning = "8080 port shutdown, This is a warning!!!")  # 发送通知try:is_port = str1.split()[3].split(':')[-1]except IndexError, e:print("out of range:", e)if is_port != '8080':print 'tomcat 启动失败'else:print 'tomcat 启动成功'else:print '8080端口正常'time.sleep(5)except KeyboardInterrupt:sys.exit('out order\n')  

# netstat -tunlp | grep ':8080' | awk '{split($7, arr, "/"); print(arr[1])}' | kill -9