使用python读取文本中结构化数据

需求

read some .txt file in dir and find min and max num in file.
solution:

echo *.txt > file.name in linux shell
>>>execfile(“mytest.py”);       //equivalent to run mytest.m in matlab
  import os
  fileobj = open("./test2images/2d_xxx.name");
  filestring = fileobj.readline();    //line is a list stored all .txt name
  filestring = filestring.split();
  dir = './test2images/'
 x = [];
 y = [];
 for i in filestring:
     dataname = open(dir + i);
      for j in range(1,15):
          data = dataname.readline();
          if not data:
              break;
          data = data.strip('\r\n');
          data = data.split();	              //It will split the long string line as a list of strings
          x.append(int(data[0]));
          y.append(int(data[1]));		
  print min(x)
  print min(y)
//normal structure of while circulation
  #   while 1:
  #       data = dataname.readline();
  #       if not data:
  #           break;

读写中英文参杂的文本

str.decode('utf8')    #str先使用utf8的方式解码，得到每个汉字为一个字符
str.encode('utf8')    #保存str到文件之前，先使用utf8的方式编码，再存储