从规则文本文件中提取列字段

 1 def iterdatainfile(filename, spliter=‘\t‘):
 2     with open(filename, ‘rt‘) as handle:
 3         for ln in handle:
 4             yield ln.split(spliter)
 5  
 6 focue, LF = 3, ‘\n‘  #LF = 3：取第4列
 7 with open("output.txt", ‘wt‘) as handle:
 8     handle.writelines([row[focue] + LF
 9                        for row in iterdatainfile(‘test.txt‘,spliter=‘|‘)])
10 
11 # 下面是显示提取到的内容
12 txtstr = open(‘output.txt‘)
13 a = txtstr.read()
14 print(a)