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Python 处理数据的实例详解
时间:2022-06-29 13:44:12 编辑:袖梨 来源:一聚教程网
Python 处理数据的实例详解
最近用python(3.2的版本)写了根据特定规则,处理数据的一个小程序,用到了一些python常用的基础知识,在此总结一下:
1,python读文件
2,python写文件
3,python的流程控制
4,python的for循环
5,python的集合,或字符串里判断是否存在某个元素
6,python的逻辑或,逻辑与
7,python的正则过滤
8,python的字符串忽略空格,和以某个字符串开头和按某个字符拆分成list
python的打开文件的模式:
关于open 模式:
w 以写方式打开,
a 以追加模式打开 (从 EOF 开始, 必要时创建新文件)
r+ 以读写模式打开
w+ 以读写模式打开 (参见 w )
a+ 以读写模式打开 (参见 a )
rb 以二进制读模式打开
wb 以二进制写模式打开 (参见 w )
ab 以二进制追加模式打开 (参见 a )
rb+ 以二进制读写模式打开 (参见 r+ )
wb+ 以二进制读写模式打开 (参见 w+ )
ab+ 以二进制读写模式打开 (参见 a+ )
处理代码如下:
defshowtxt(path,outpathname,detailpath): greenpath=r"C:UsersqindongliangDesktoptnstxtgreen.txt"; redpath=r"C:UsersqindongliangDesktoptnstxtred.txt"; redset=listtxt(redpath) greenset=listtxt(greenpath) print("红色词数量: ",len(redset)) print("绿色词数量: ",len(greenset)) #符合1条件的内容写入 f1=open(r"C:UsersqindongliangDesktoptnstxtresult"+detailpath+"1.txt",encoding="UTF-8",mode="a+") #符合2条件的内容写入 f2=open(r"C:UsersqindongliangDesktoptnstxtresult"+detailpath+"2.txt",encoding="UTF-8",mode="a+") #符合3条件的内容写入 f3=open(r"C:UsersqindongliangDesktoptnstxtresult"+detailpath+"3.txt",encoding="UTF-8",mode="a+") #符合4条件的内容写入 f4=open(r"C:UsersqindongliangDesktoptnstxtresult"+detailpath+"4.txt",encoding="UTF-8",mode="a+") delcount=1; f=open(path,encoding="UTF-8",mode="r+") fnew=open(outpathname,encoding="UTF-8",mode="a+") flog=open(outpathname+".log",encoding="UTF-8",mode="a+") #count=1; forlineinf: list=line.strip().split("t") line=line.strip() catalogid=list[0] score=list[1] keyword=clear(list[4].strip()) ifkeywordinredset: ifcatalogid.startswith("018022")orcatalogid.startswith("018035")orcatalogid.startswith("014023003") : f1.write(line+"n")#符合1条件写入 fnew.write(line+"n")#符合1条件写入 else: flog.write(line+" 不符合条件1 "+"n") delcount=delcount+1 ifkeywordingreenset: ifnot(catalogid.startswith("018022")orcatalogid.startswith("018035")orcatalogid.startswith("014023003")) : fnew.write(line+"n") else: f2.write(line+"n") flog.write(line+" 不符合条件2"+"n") delcount=delcount+1 flist=formatStrList(keyword) if"sexy"inflistor"sex"inflist: ifcatalogid.startswith("018022")orcatalogid.startswith("018035")orcatalogid.startswith("014023003") : f3.write(line+"n") fnew.write(line+"n") else: flog.write(line+" 不符合条件3"+"n") delcount=delcount+1 #if (keyword.find("underwear")!=-1) & keyword.find("sexy")==-1 & keyword.find("sex")==-1: if"underwear"inflistand"sexy"notinflistand"sex"notinflist: ifcatalogid.startswith("014032") : f4.write(line+"n") fnew.write(line+"n") else: flog.write(line+" 不符合条件4"+"n") delcount=delcount+1 #print(list[0]," ",list[1]," ",list[4]) #print() flog.write("删除总数目: "+str(delcount)) f.close() f1.close() f2.close() f3.close() f4.close() fnew.close() flog.close() importre defclear(str): str=re.sub("[""''+]","",str) returnstr defformatStrList(keyword): list=keyword.split(" ") foriteminlist: item.strip(); returnlist deflisttxt(path): f=open(path,encoding="UTF-8") s=set() forlineinf: s.add(line.strip()) f.close() returns path1=r"C:UsersqindongliangDesktoptnstxthighfrequency.txt" pathout1=r"C:UsersqindongliangDesktoptnstxtdetaila_highfrequency.txt" detail1path="highfrequency" path2=r"C:UsersqindongliangDesktoptnstxthighfrequency_d1.txt" pathout2=r"C:UsersqindongliangDesktoptnstxtdetailb_highfrequency_d1.txt" detail2path="highfrequency_d1" #showtxt(path1,pathout1,detail1path)