code: def extract_files_from_dict(d):
      
      files = {}
      for key, value in six.iteritems(d):
          if isinstance(value, dict):
              files[key] = extract_files_from_dict(value)
          elif is_file_like(value):
              files[key] = value
      return files
docs: Return any file objects from the provided dict.
  
      >>> extract_files_from_dict({
      ... 'oauth_token': 'foo',
      ... 'track': {
      ...   'title': 'bar',
      ...   'asset_data': open('setup.py', 'rb')
      ...  }})  # doctest:+ELLIPSIS
      {'track': {'asset_data': <...}}