python day5--正则表达式

Posted 2020-08-03 一个人的北京

#----正则表达式

import re 
elink = \'<a href="(.*)">(.*)</a>\' 
info = \'<a href="http://www.baidu.com">baidu</a>\' 
cinfo = re.findall(elink,info) 
print (cinfo)

 

import re
print(re.search (r\'^a\',\'abc\\neee\'))
#预期结果 ^匹配字符开头
# <_sre.SRE_Match object; span=(0, 1), match=\'a\'>
data=(re.match(\'^zhang\',\'zhangyazhang\'))
print(data)
#<_sre.SRE_Match object; span=(0, 5), match=\'zhang\'>
data.group() #获取到zhang这个值。

res=(re.match(\'^zhang\\d\',\'zhang123yazhang\'))
print(res)
#<_sre.SRE_Match object; span=(0, 6), match=\'zhang1\'>

res=(re.match(\'^zhang\\d+\',\'zhang123yazhang\'))
print(res)
#<_sre.SRE_Match object; span=(0, 8), match=\'zhang123\'>
res=(re.match(\'.+\',\'zhang123yazhang\'))
print(res)
#匹配所有字符
#<_sre.SRE_Match object; span=(0, 15), match=\'zhang123yazhang\'>
data=re.search(\'a.+d$\',\'zhangabcd\')
print(data)
#$匹配最后一个字符
#<_sre.SRE_Match object; span=(2, 9), match=\'angabcd\'>
print(re.findall("ab+","ab+cd+abb+bba"))
#[\'ab\', \'abb\']
print(re.findall("ab*","cabcabb3bbac") )
#--匹配*号前的字符0次或多次 (解释*号前是b,匹配b 0次或多次，a是前面必须有的，匹配b零次)
#[\'ab\', \'abb\', \'a\']
print(re.findall(r\'\\d+\',\'a512b6\'))
#[\'512\', \'6\']


print(re.findall(r\'\\d+\',\'one1two2three3four4\'))
#[\'1\', \'2\', \'3\', \'4\']

#-----sub的用法 --把content中的内容按link的模式替换成www.cnpythoner.com
import re
link = ("\\d+")
content = "laowang-222haha"
info = re.sub(link,\'www.cnpythoner.com\',content)
print (info)
#laowang-www.cnpythoner.comhaha
等价于
print(re.sub("\\d+",\'www.cnpythoner.com\',"laowang-222haha"))

 

导入包的质是执行包下的_init_.py文件
#bao\\_init.py
def day_test():
    print("in the day_test")
day_test()

#bao_test.py

import bao

 

import导入模块
#--------main.py
def test():
    print("in the test ")
test()
#--------module1.py
name = \'alex\'
def test2():
    print("in the test2")

test2()
#---module.py执行
#import main,module1
# module1.test2()
# print(module1.name)
#---------另一种方式module.py执行
# from main import test
# from module1 import test2
# test()
# test2()

import re,time

print(re.search("abc|ABC","ab1cABCBCD").group()) #ABC
print(re.search("[A-Za-z0-9]a","0aAB").group())#0aAB
print(re.findall("[0-9]{1,3}","aa1x2a34567")) #[\'1\', \'2\', \'345\', \'67\']

print(re.search("(?P<province>[0-9]{4})(?P<city>[0-9]{2})(?P<birthday>[0-9]{4})","371419938106143242").groupdict("birthday"))
{\'province\': \'3714\', \'birthday\': \'9381\', \'city\': \'19\'}
#\'\\n\'是换行,\'\\t\'是tab,\'\\\\\'是\\
print(re.search("(?P<id>[0-9]+)","abcd1234daf@34").group()) #1234
print(re.search("(?P<id>[0-9]+)","abcd1234daf@34").groupdict(id)) #{\'id\': \'1234\'}
print(re.split("[0-9]+","avb12fsd2ff3tt5D"))#[\'avb\', \'fsd\', \'ff\', \'tt\', \'D\']
print(re.sub("[0-9]+","|","ab1ee888iii0BBVV9$%"))#ab|ee|iii|BBVV|$%
print(re.sub("[0-9]+","|","ab1ee888iii0BBVV9$%",count=2))#ab|ee|iii0BBVV9$%

import  re
print (re.search("\\s+", "ab- \\r\\n  ") )
#<_sre.SRE_Match object; span=(3, 8), match=\' \\r\\n  \'>

表示时间：1）时间戳 2）格式化的时间字符串 3）元组（struct_time）

import time
res=time.time()
print(res)#1472142901.0856912
x=res/3600/24/365 #46.681345163802995
print(x) #1970+46=2016
print(time.localtime(323233211))
x=323233211/3600/24/365
print(x)#1970+10=1980 时间戳表示的是从1970年1月1日00:00:00开始按秒计算的偏移量
y=time.localtime(323233211)
print(y)
print(y.tm_year) #y=1980

y=time.localtime(323233211)
print(y)#struct
print(time.mktime(y))#元组转换成时间戳  323233211.0
#print(time.asctime()) #等于print(time.asctime(time.localtime()))
#Thu Aug 25 21:55:06 2016


print(time.asctime()) #等于print(time.asctime(time.localtime()))
#Thu Aug 25 21:55:06 2016


data=time.strptime("2016/08/25","%Y/%m/%d") #将日期字符串 转成 struct时间对象格式
print(data)
res=time.mktime(data) #将struct时间对象转成时间戳
print(res)

 

import datetime,time
print(datetime.datetime.now()) #2016-08-25 23:42:44.481994
print(datetime.date.fromtimestamp(time.time()) ) #2016-08-25
print(datetime.datetime.now()+datetime.timedelta(hours=3)) #当前时间+3小时
print(datetime.datetime.now()+datetime.timedelta(3)) #当前时间+3天
print(datetime.datetime.now()+datetime.timedelta(minutes=3))#当前时间+3分钟

c_time = datetime.datetime.now()
print(c_time) #打印当前时间
print(c_time.replace(minute=3,hour=2)) #时间替换