docs: def readfile(filename, binary=False):
      """ Reads the contents of the specified file.
  
          `filename`
              Filename to read.
          `binary`
              Set to ``True`` to indicate a binary file.
  
          Returns string or ``None``.
          """
  
      if not os.path.isfile(filename):
          return None
  
      try:
          flags = 'r' if not binary else 'rb'
          with open(filename, flags) as _file:
              return _file.read()
  
      except (OSError, IOError):
          return None