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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _ReadAppJsonFile(self, relative_path):
 """Reads JSON file from an application directory. Args: relative_path: file name relative to application root directory. Returns: Parsed JSON data or None if the file does not exist, can't be read or not a valid JSON file. """

    try:
      with open(os.path.join(sys.path[0], relative_path), 'r') as f:
        return json.load(f)
    except (IOError, ValueError):
      return None