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:
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def showtxt(path,outpathname,detailpath):
greenpath = r "C:\\Users\\qindongliang\\Desktop\\tnstxt\\green.txt" ;
redpath = r "C:\\Users\\qindongliang\\Desktop\\tnstxt\\red.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:\Users\qindongliang\Desktop\tnstxt\result\\"+detailpath+" \\ 1.txt ",encoding=" UTF - 8 ",mode=" a + ")
#符合2条件的内容写入
f2 = open (r "C:\Users\qindongliang\Desktop\tnstxt\result\\"+detailpath+" \\ 2.txt ",encoding=" UTF - 8 ",mode=" a + ")
#符合3条件的内容写入
f3 = open (r "C:\Users\qindongliang\Desktop\tnstxt\result\\"+detailpath+" \\ 3.txt ",encoding=" UTF - 8 ",mode=" a + ")
#符合4条件的内容写入
f4 = open (r "C:\Users\qindongliang\Desktop\tnstxt\result\\"+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;
for line in f:
list = line.strip().split( "\t" )
line = line.strip()
catalogid = list [ 0 ]
score = list [ 1 ]
keyword = clear( list [ 4 ].strip())
if keyword in redset:
if catalogid.startswith( "018022" ) or catalogid.startswith( "018035" ) or catalogid.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
if keyword in greenset:
if not (catalogid.startswith( "018022" ) or catalogid.startswith( "018035" ) or catalogid.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" in flist or "sex" in flist:
if catalogid.startswith( "018022" ) or catalogid.startswith( "018035" ) or catalogid.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" in flist and "sexy" not in flist and "sex" not in flist:
if catalogid.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()
import re
def clear( str ):
str = re.sub( "[\"\"\'\'+]" ,"", str )
return str
def formatStrList(keyword):
list = keyword.split( " " )
for item in list :
item.strip();
return list
def listtxt(path):
f = open (path,encoding = "UTF-8" )
s = set ()
for line in f:
s.add(line.strip())
f.close()
return s
path1 = r "C:\\Users\\qindongliang\\Desktop\\tnstxt\\highfrequency.txt"
pathout1 = r "C:\\Users\\qindongliang\\Desktop\\tnstxt\\detail\\a_highfrequency.txt"
detail1path = "highfrequency"
path2 = r "C:\\Users\\qindongliang\\Desktop\\tnstxt\\highfrequency_d1.txt"
pathout2 = r "C:\\Users\\qindongliang\\Desktop\\tnstxt\\detail\\b_highfrequency_d1.txt"
detail2path = "highfrequency_d1"
#showtxt(path1,pathout1,detail1path)
showtxt(path2,pathout2,detail2path)
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以上就是对Python 的数据处理的实例详解,如有疑问请留言或者到本站社区交流讨论,感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!
原文链接:http://qindongliang.iteye.com/blog/2162304