Save Audio from Text.py

from django.db import models
from django.utils import timezone
from django.core.urlresolvers import reverse

from gtts import gTTS
from django.core.files.storage import default_storage as storage
from django.core.files.base import ContentFile
from cStringIO import StringIO

import requests.packages.urllib3
requests.packages.urllib3.disable_warnings()

import datetime, time, threading


class Process_Threading(threading.Thread):
	def __init__(self, detail):
		self.detail = detail
		threading.Thread.__init__(self)

	def run(self):
		txt = str(self.detail)
		tts = gTTS(text=txt, lang='id')
		tts.save("gallery/coba.mp3")

#Checking if file is available to remove it: http://stackoverflow.com/a/4905384/3445802
from django.core.files.storage import FileSystemStorage
class OverwriteStorage(FileSystemStorage):                                                            
	def _save(self, name, content):
		if self.exists(name):
			self.delete(name)
		return super(OverwriteStorage, self)._save(name, content)

	def get_available_name(self, name):
		return name

class Audio(models.Model):
	....
	detail = models.TextField()
	mp3 = models.FileField(upload_to='files/audio/%Y/%m/%d', null=True, blank=True, storage=OverwriteStorage())

	def make_audio(self, detail, mp3):
		Process_Threading(detail).start()

		fh = storage.open("coba.mp3")#, "r") #removing "r" mode, because if read mode, `StringIO` can't read it.
		temp_audio = StringIO(fh.read()) #read file strorage with `StringIO`.
		temp_audio.seek(0) #buff seek.
		mp3.save("coba.mp3", ContentFile(temp_audio.read()), save=False)
		fh.close()

		return True

	def save(self, *args, **kwargs):
		super(Audio, self).save(*args, **kwargs)
		if not self.make_audio(self.detail, self.mp3):
			raise Exception('Could not create audio - is the file type valid?')