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

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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) 

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