python实现txt文件格式转换为arff格式

本文实例为大家分享了python实现txt文件格式转换为arff格式的具体代码，供大家参考，具体内容如下

将文件读取出来的时候默认都是字符型的，所以有转换出来有点问题，但是还是可以用的。

文件要求第一行是你对应的属性名，之后是数字。

import sys 
import re 
 
relationname = "" 
filename = "" 
 
if (len(sys.argv)<2): 
  print("usage:\npython arff.py myrelationname filename.txt") 
else: 
  relationname = sys.argv[1] 
  filename = sys.argv[2] 
 
 
class arff: 
  def __init__(self, r, f): 
    self.relationname = r if r is not "" else "machinelearning" 
    f = f if f is not "" else "mmg_data.txt" 
    self.file1 = open(f, 'r') 
    self.data = [] 
    self.names = [] 
    self.parsedata() 
    self.writetofile() 
 
  def parsedata(self): 
    firstline = true 
    for line in self.file1.readlines(): 
      if not firstline: 
        try: 
          line = line.replace("\n", "") 
          words = line.split(" ") 
        except valueerror: 
          print("cant parse file!!") 
        self.data.append(words) 
      else: 
        firstline = false 
        line = line.replace("\n", "") 
        words = line.split(" ") 
        self.names = words 
 
  def gettype(self, value): 
    v = "" 
    if(type(value) == type(1)): 
      v = "numeric" 
    elif(type(value) == type(1.0)): 
      v = "numeric" 
    elif(re.match("[0-9]{4}\-[0-9]{2}\-[0-9]{2}\s[0-9]{2}\:[0-9]{2}\:[0-9]{2}", value)): 
      v = "date " + "yyyy-mm-dd hh:mm:ss" 
    elif(type(value) == type("string")): 
      v = "string" 
    elif(v == ""): 
      print("data type "+value+" not supported yet.") 
    return v 
 
  def writetofile(self): 
    values = self.data[0] 
    file2 = open("dexhunter_test_result.arff", 'w+' ) 
 
    self.relationname+="\n" 
 
    relationstring = '@relation ' + self.relationname 
    file2.write(''+relationstring+'') 
 
    for i in range(len(self.names)): 
      str2 = "@attribute " + self.names[i] + " " + self.gettype( values[i] ) + "\n" 
      file2.write(''+str2+'') 
    file2.write('''''@data\n''') 
 
    for line in self.data: 
      try: 
        file2.write(",".join(line)+"\n") 
      except unicodeencodeerror: 
          print("cant write data to file!!") 
 
arff(relationname, filename) 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。