Python base day-13[module: Re,subprocess not finished]

Re (cont.):

The re defaults to greedy mode.

Greedy mode: Matches the string as long as possible when matching matches are met.

ImportRes='ASKLDLAKSDABCCCCCCCCASDABCCCALSDACBCCCACBCCCABCCC'Res= Re.findall ('abc+', s)Print(res) Res= Re.findall ('abc+?', s) #在规则后面加? To cancel the greedy mode. Print(res) execution Result: D:\Python\Python36-32\python.exe e:/python/day-15/3213. py['ABCCCCCCCC','ABCCC','ABCCC']['ABC','ABC','ABC']process finished with exit code 0

Re modules are commonly used in the following ways:

Re.split (): A string-like split command but more powerful than the split string.

ImportRes='ASKLDLAKSDAB8CCCCC.CCCAS8DABC8CC.ALSDACBCCCAC.CCCAB8CCC'Res= Re.split ('\d', s)Print(res) Res= Re.split ('(\d+)', s) #加 () to preserve the separatorPrint(res) execution Result: D:\Python\Python36-32\python.exe e:/python/day-15/3213. py['Askldlaksdab','Ccccc.cccas','DABC','Cc.alsdacbcccac.cccab','CCC']['Askldlaksdab','8','Ccccc.cccas','8','DABC','8','Cc.alsdacbcccac.cccab','8','CCC']process finished with exit code 0

Re.sub (): Similar to replace replacement operation.

Import'askldlaksdab8ccccc.cccas8dabc8cc.alsdacbcccac.cccab8ccc '  = re.sub ('abc+','123', s)print  (res) execution Result: D:\Python\Python36-32\python.exe e:/python/day-15/3213. Pyaskldlaksdab8ccccc.cccas8d1238cc.alsdacbcccac.cccab8cccProcess finished with exit code 0

Re.compile (): Compiling

ImportRes='ASKLDLAKSDAB8CCCCC.CCCAS8DABC8CC.ALSDACBCCCAC.CCCAB8CCC'obj= Re.compile ('\d+') #定义一个对象对应的编译规则res=Obj.findall (s) #调用处理Print(res) execution Result: D:\Python\Python36-32\python.exe e:/python/day-15/3213. py['8','8','8','8']process finished with exit code 0

A small reptile is practicing (climbing the campus network)

ImportRequests,re,jsonurl='http://www.xiaohuar.com/2014.html' #校花排行榜top120defreq (): Req_str=requests.get (URL)#print (' encoding ', req_str.encoding)    returnReq_str.textdefrun (): HTML=req () HTML= Html.encode ('Latin-1'). Decode ('GBK')    #print (HTML)obj = Re.compile ('<div class= "Top-title" > (. *?) </div>.*?<div class= "title" >.*?target= "_blank" > (. *?) </a></span></div>', Re. S) #匹配top排名序号和姓名学校 Res=obj.findall (HTML)returnResdic={}res=Run () forXinchRes:dic[x[0]]=x[1]data=json.dumps (DIC) #序列化with open ('Xiaohua.json','a', encoding='Utf-8') as F:f.write (data) with open ('Xiaohua.json','R', encoding='Utf-8') as F:data=json.load (f) #反序列化Print(data)

Subprocess:

The Subprocess module allows a process to create a new child process, connect to the stdin/stdout/stderr of the child process through a pipeline, and get the return value of the child process.

Importsubprocesss= subprocess. Popen ('dir', shell=true,stdout=subprocess. PIPE)Print(S.stdout.read (). Decode ('GBK')) Results of execution: D:\Python\Python36-32\python.exe e:/python/day-15/3213the volume in. PY Drive E is not labeled. The serial number of the volume is 383D-453A E:\Python\DAY-15the directory2017/06/27 19:52 <DIR>          .2017/06/27 19:52 <DIR>          ..2017/06/27 19:52 338 3213. PY2017/06/27 19:47 778tmp.py2017/06/27 19:25 9,146Xiaohua.json3 Files 10,262bytes2 Listings 117,877,260,288Free bytes process finished with exit code 0

Python base day-13[module: Re,subprocess not finished]