目录
一、re模块
正则：判断、验证、查找
获取匹配：在字符串中查找满足条件的内容
re.findall(表达式，字符串)：查找所有满足条件的内容
re.search(表达式，字符串)：从头开始，只找一个非获取匹配：仅仅用于判断字符串是否符合规则（返回bool值）
re.match(表达式，字符串)：从头开始，匹配不上就不管了重复匹配：
*：任意次数 +：1~无穷 次 ？：0~1 次 {a，b} 最小a次，最多b次
分组：优先获取括号内的内容 （？：） ？：可取消优先级
贪婪匹配： * 或 +
非贪婪匹配：表达式加 ？
import re
# print(re.findall('alex','hahahah alex is alex is dsb'))
# alex
# print(re.findall('\w','Aah123 +-_'))
# \w
# print(re.findall('\w\w','Aah123 +-_'))
# \w\w
# ['Aa','h1','23',]
# print(re.findall('\w9\w','Aa9h123 aaa9c+-_'))
# \w9\w
# ['a9h','a9c']
# print(re.findall('\W','Aah123 +-_'))
# print(re.findall('\s','Aah\t12\n3 +-_'))
# print(re.findall('\S','Aah\t12\n3 +-_'))
# print(re.findall('\d','Aah\t12\n3 +-_'))
# print(re.findall('\D','Aah\t12\n3 +-_'))
# print(re.findall('\w\w\d\d','asfdasdfegon001adfadfegon002asdfxx01 yy02'))
# print(re.findall('\s','Aah\t12\n3 +-_'))
# print(re.findall('\t','Aah\t12\n3 +-_'))
# print(re.findall('\n','Aah\t12\n3 +-_'))
# ^: 仅从头开始匹配
# print(re.findall('^alex',' alex is alex is alex'))
# ^alex
# $: 仅从尾部开始匹配
# print(re.findall('alex$',' alex is alex is alex1'))
# alex$
# .: 代表匹配一个字符,该字符可以是除换行符之外任意字符
# print(re.findall('a.c','a a1c aaac a c asfdsaf a\nc',re.DOTALL))
# a.c
# ['a1c','aac','a c','a\nc']
# []:代表匹配一个字符,这一个字符是来自于我们自定义的范围
# print(re.findall('a[0-9]c','a,c a a1c a9c aaac a c asfdsaf a\nc',re.DOTALL))
# print(re.findall('a[a-zA-Z]c','a,c aAc a1c a9c aaac a c asfdsaf a\nc',re.DOTALL))
# print(re.findall('a[a-zA-Z]c','a,c aAc a1c a9c aaac a c asfdsaf a\nc',re.DOTALL))
# print(re.findall('a[+*/-]c','a,c a+c a-c a*c a/c aAc a1c a9c aaac a c asfdsaf a\nc',re.DOTALL))
# print(re.findall('a[+*\-/]c','a,c a+c a-c a*c a/c aAc a1c a9c aaac a c asfdsaf a\nc',re.DOTALL))
# print(re.findall('a[^0-9]c','a,c a a1c a9c aaac a c asfdsaf a\nc',re.DOTALL))
# 重复匹配
# ?:代表左边那一个字符出现0次到1次
# print(re.findall('ab?','a ab abb abbbb a123b a123bbbb'))
# ab?
# ['a','ab','ab','ab','a','a']
# *: 代表左边那一个字符出现0次到无穷次
# print(re.findall('ab*','a ab abb abbbb a123b a123bbbb'))
# ab*
# ['a','ab','abb','abbbb','a','a']
# +: 代表左边那一个字符出现1次到无穷次
# print(re.findall('ab+','a ab abb abbbb a123b a123bbbb'))
# ab+
# ['ab','abb','abbbb']
# {n,m}:代表左边那一个字符出现n次到m次
# print(re.findall('ab{1,3}','a ab abb abbbb a123b a123bbbb'))
# ['ab', 'abb', 'abbb']
# print(re.findall('ab{1,}','a ab abb abbbb a123b a123bbbb'))
# print(re.findall('ab+','a ab abb abbbb a123b a123bbbb'))
# print(re.findall('ab{0,}','a ab abb abbbb a123b a123bbbb'))
# print(re.findall('ab*','a ab abb abbbb a123b a123bbbb'))
# print(re.findall('ab{3}','a ab abb abbbb a123b a123bbbb'))
# .*: 匹配任意0个到无穷个字符,贪婪匹配
# print(re.findall('a.*c','a123213123asdfasdfc123123123123+-0)((c123123'))
# a.*c
#.*?:匹配任意0个到无穷个字符,非贪婪匹配
# print(re.findall('a.*?c','a123213123asdfasdfc123123123123+-0)((c123123'))
#|:或者
# print(re.findall('companies|company','Too many companies have gone bankrupt,c and the next one is my company'))
# companies|company
#():分组
# print(re.findall('compan(?:ies|y)','Too many companies have gone bankrupt,c and the next one is my company'))
# compan(ies|y)
# print(re.findall('href="(.*?)"','<p>动感视频</p><a href="https://www.douniwan.com/1.mp4">逗你玩呢</a><a href="https://www.xxx.com/2.mp4">葫芦娃</a>'))
# href=".*?"
# 'a\\c'
# print(re.findall('a\\\\c','a\c aac'))
# print(re.findall(r'a\\c','a\c aac'))
# print(re.findall('alex','my name is alex Alex is dsb aLex ALeX',re.I))
#忽略大小写
# print(re.findall('alex','my name is alex Alex is dsb aLex ALeX',re.I))
# msg="""
# my name is egon
# asdfsadfadfsadf egon
# 123123123123123egon
# """
# print(re.findall('egon$',msg,re.M)) #my name is egon\nasdfsadfadfsadf egon\n123123123123123egon'
#re模块其他方法
# res=re.findall('(href)="(.*?)"','<p>动感视频</p><a href="https://www.douniwan.com/1.mp4">逗你玩呢</a><a href="https://www.xxx.com/2.mp4">葫芦娃</a>')
# print(res)
#
# res=re.search('(href)="(.*?)"','<p>动感视频</p><a href="https://www.douniwan.com/1.mp4">逗你玩呢</a><a href="https://www.xxx.com/2.mp4">葫芦娃</a>')
# print(res)
# print(res.group(0))
# print(res.group(1))
# print(res.group(2))
#
#
# res=re.match('abc','123abc') ## res=re.search('^abc','123abc')
# print(res)
#
# print(re.findall('alex','alex is alex is alex'))
# print(re.search('alex','alex is alex is alex'))
# print(re.match('alex','alex is alex is alex'))
#
# pattern=re.compile('alex')
# print(pattern.findall('alex is alex is alex'))
# print(pattern.search('alex is alex is alex'))
# print(pattern.match('alex is alex is alex'))
# ['1', '2', '60', '-40.35', '5', '-4', '3']
msg="1-2*(60+(-40.35/5)-(-40*3))"
print(re.findall('\D?(-?\d+\.?\d*)',msg))
# msg="1-2*(60+(-40.35/5)-(-40*3))"
# \D?-?\d+\.?\d*
二、hashlib模块
1.什么是hash
hash是一种算法，该算法接受一系列的数据，经过运算会得到一个hash值
2.三大特性：
- 只要传入的内容一样，那么得到的hash值一定是一样
- 只要采用hash算法固定，无论传入的内容多大，hash值的长度是固定
- hash值不可逆，即不能通过hash值逆推出内容
3.为何要用hash
特性1+2=》文件完整性校验
特性3==》
基本模板：
import hashlib
m=hashlib.md5()
m.update("str".encode("utf-8"))
m.hexdigest例子：
import hashlib
# m=hashlib.md5()
# m.update('你好'.encode('utf-8'))
# m.update('hello'.encode('utf-8'))
# print(m.hexdigest()) #65c83c71cb3b2e2882f99358430679c3
#
# m1=hashlib.md5()
# m1.update('你好hello'.encode('utf-8'))
# print(m1.hexdigest()) #65c83c71cb3b2e2882f99358430679c3
# print(len(m1.hexdigest())) #32
# m2=hashlib.sha512()
# m2.update(b'asdfassssssssssssssssssssssssssss')
# print(m2.hexdigest())
# print(len(m2.hexdigest()))
#
# with open(r'D:\脱产5期内容\day17\今日内容',mode='rb') as f:
# m=hashlib.md5()
# for line in f:
# m.update(line)
# print(m.hexdigest())
pwd=input('password>>> ').strip()
m=hashlib.md5()
m.update('天王盖地虎'.encode('utf-8'))
m.update(pwd.encode('utf-8'))
m.update('一行白鹭上青天'.encode('utf-8'))
print(m.hexdigest())