Python提取一组数据的第一个字符以及第一个到第三个字符

codegay

1. """
   
2. python正则提取一组数据的第一个字符以及第一个到第三个字符
   
3. http://www.bathome.net/thread-38635-1-1.html
   
4. 依山居 3:43 2015/12/19
   
5. 
   
6. """
   
7. import re
   
8. with open("data.txt") as f:
   
9.     txt=f.read()
   
10.    
    
11. rep=re.compile("(\w|~{1})(\w*)")
    
12. result1=re.sub(rep,"\\1",txt)
    
13. with open("result1.txt","w+") as f:
    
14.     f.write(result1)
    
15. 
    
16. rep=re.compile("(\w{3})(\w*)")
    
17. result2=rep.sub("\\1",txt)
    
18. with open("result2.txt","w+") as f:
    
19.     f.write(result2)
    
20. 
    
21.         
    

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依山居

1. """
   
2. python切片提取一组数据的第一个字符以及第一个到第三个字符.py
   
3. http://www.bathome.net/thread-38635-1-1.html
   
4. 依山居 1:02 2015/12/17
   
5. """
   
6. with open("data.txt") as f:
   
7.     txt=[r.rstrip().split() for r in f.readlines()]
   
8.    
   
9. result1=''
   
10. result2=''
    
11. for r in txt:
    
12.     sstr1=''
    
13.     sstr2=''
    
14.     for s in r:
    
15.         if len(s)>3:
    
16.             sstr1+=s[0]+" "
    
17.             sstr2+=s[0:3]+" "
    
18.         else:
    
19.             sstr1+=s
    
20.             sstr2+=s
    
21.     result1+=sstr1+"\n"
    
22.     result2+=sstr2+"\n"
    
23. 
    
24. with open("result1.txt","w+") as f:
    
25.     f.write(result1)
    
26. with open("result2.txt","w+") as f:
    
27.     f.write(result2)
    

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