总结的小知识点(更新)

ConfigParser模块:

#!/sur/bin/env python
# -*- coding:utf-8 -*-
__author__ = 'ganzl'
import ConfigParser
config = ConfigParser.ConfigParser()
config.read('i.cfg')

secs = config.sections()
print 'sections:',secs
options = config.options('group2')
print 'options:',options

item_list = config.items('group2')
print 'item:',item_list
for k,v in item_list:
    print k,v

i.cfg:
[section1]
k1 = v1
k2:v2
[section2]
host = 1.0.0.1
[group2]
gan : 123
host1 = 2.0.0.2
host2 = 3.0.0.3
[111]
a : b

作用:对同一模块的服务器进行批量命令操作:
python python_cmd.py group2 'ifconfig'
View Code

递归小demo:

#!/sur/bin/env python
# -*- coding:utf-8 -*-
__author__ = 'ganzl'
def func(arg1,arg2,times):
    times += 1
    count = arg1+arg2
    if count>1000:
        return  count
    ret = func(arg2,count,times)
    #return func(arg2,count,times)
    print ret,times-1

ret = func(0,1,1)
print ret
View Code
#!/sur/bin/env python
# -*- coding:utf-8 -*-
__author__ = 'ganzl'
def func(arg1,arg2,times):
    times += 1
    count = arg1+arg2
    if count>1000:
        return  count
    #ret = func(arg2,count,times)
    return func(arg2,count,times)
    #print ret,times-1

ret = func(0,1,1)
print ret

比较下这两个小demo。类似这个递归,其他源码经常看到
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 re:

字符:

  . 匹配除换行符以外的任意字符
  w 匹配字母或数字或下划线或汉字
  s 匹配任意的空白符
  d 匹配数字
   匹配单词的开始或结束
  ^ 匹配字符串的开始
  $ 匹配字符串的结束

次数:

  * 重复零次或更多次
  + 重复一次或更多次
  ? 重复零次或一次
  {n} 重复n次
  {n,} 重复n次或更多次
  {n,m} 重复n到m次

IP:
^(25[0-5]|2[0-4]d|[0-1]?d?d)(.(25[0-5]|2[0-4]d|[0-1]?d?d)){3}$
手机号:
^1[3|4|5|8][0-9]d{8}$
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#!/sur/bin/env python
# -*- coding:utf-8 -*-
__author__ = 'ganzl'
import re
#以加减乘除或者单独除进行切割
content = "'1 - 2 * ((60-30+1*(9-2*5/3+7/3*99/4*2998+10*568/14))-(-4*3)/(16-3*2) )'"
new_content1 = re.split('[+-*/]+', content)
new_content2 = re.split('*', content, 1)
print 'new_content1',new_content1
print 'new_content2',new_content2
#将空格去掉,并以(加减乘除数字重复一次的形式)切割
inpp = '1-2*((60-30 +(-40-5)*(9-2*5/3 + 7 /3*99/4*2998 +10 * 568/14 )) - (-4*3)/ (16-3*2))'
inpp = re.sub('s*','',inpp)
new_content3 = re.split('(([+-*/]?d+[+-*/]?d+){1})', inpp)
print 'new_content3:',new_content3
#截取格式:(加减乘除数字,带小数,重复两次以上的形式)切割
inpp = '1 - 2 * ( (60-30 +(-40.0/5) * (9-2*5/3 + 7 /3*99/4*2998 +10 * 568/14 )) - (-4*3)/ (16-3*2) ) '
inpp = re.sub('s*','',inpp)
content = re.search('(([+-*/]*d+.*d*){2,})', inpp).group()
before, ret, after = re.split('(([+-*/]*d+.*d*){2,})',inpp,1)
print 'content',content
print 'before:',before
print 'ret:',ret
print 'after:',after


上面用到sub/split方法。
还有其他方法(下次用到时再实践下就好)
obj = re.match('d+', '123uuasf')
obj = re.search('d+', 'u123uu888asf')
re.search("([0-9]*)([a-z]*)([0-9]*)", a).group()
obj = re.findall('d+', 'fa123uu888asf')
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 看高人用正则跟递归写的计算器:

http://www.cnblogs.com/wupeiqi/articles/4949995.html

原文地址:https://www.cnblogs.com/shoug/p/5151659.html