如何在Django中打开用户上传的文件

Question

所以我试图打开并操作存储在我的Django应用程序的MEDIA_ROOT目录中的用户上传文件。

截至目前，我只能打开项目目录中的文件。我尝试访问Data_Files目录中media目录中的文件如下：

尝试＃1

file_upload_dir = os.path.join(settings.MEDIA_ROOT, 'Data_Files')
data_file = open(os.path.join(file_upload_dir, new_file), 'rb')
raw_data = data_file.read()

尝试＃2

file_upload_dir = os.path.join(settings.MEDIA_ROOT, 'Data_Files')
data_file = default_storage.open(os.path.join(file_upload_dir, new_file), 'r')
raw_data = data_file.read()

我的第二次尝试利用了Django的FileStorage API，但是除了项目目录中的文件之外，它们都不允许我访问文件。

给出的错误是：

file b'PVP3.CSV' does not exist

带有追溯：

Environment:


Request Method: POST
Request URL: http://127.0.0.1:8000/graphite/file_upload/

Django Version: 1.7.1
Python Version: 3.4.2
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'graphite',
 'debug_toolbar')
Installed Middleware:
('django.middleware.cache.UpdateCacheMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'debug_toolbar.middleware.DebugToolbarMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'django.middleware.cache.FetchFromCacheMiddleware')


Traceback:
File "C:\Python34\lib\site-packages\django-1.7.1-py3.4.egg\django\core\handlers\base.py" in get_response
  111.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Python34\lib\site-packages\django-1.7.1-py3.4.egg\django\contrib\auth\decorators.py" in _wrapped_view
  22.                 return view_func(request, *args, **kwargs)
File "C:\Users\vut46744\Desktop\graphite_project\graphite\views.py" in upload_file
  112.  data_df = html_graph(request)
File "C:\Users\vut46744\Desktop\graphite_project\graphite\views.py" in html_graph
  310.      data_df = pd.read_csv(new_file, skiprows=header_row).drop(0, axis=0).astype(float)
File "C:\Python34\lib\site-packages\pandas\io\parsers.py" in parser_f
  465.         return _read(filepath_or_buffer, kwds)
File "C:\Python34\lib\site-packages\pandas\io\parsers.py" in _read
  241.     parser = TextFileReader(filepath_or_buffer, **kwds)
File "C:\Python34\lib\site-packages\pandas\io\parsers.py" in __init__
  557.         self._make_engine(self.engine)
File "C:\Python34\lib\site-packages\pandas\io\parsers.py" in _make_engine
  694.             self._engine = CParserWrapper(self.f, **self.options)
File "C:\Python34\lib\site-packages\pandas\io\parsers.py" in __init__
  1056.         self._reader = _parser.TextReader(src, **kwds)

Exception Type: OSError at /graphite/file_upload/
Exception Value: File b'PVP3.CSV' does not exist

是否有不同的方式来访问这些文件，或者我的代码是否存在逻辑错误？