code: def is_frame_number(value):
      """Determines whether the provided value is a frame number.
  
      Frame numbers are strictly positive integers.
  
      Args:
          value: a value
  
      Returns:
          True/False
  
      Raises:
          :class:`FrameError`: if ``value`` is an integer but is not strictly
              positive
      """
      if isinstance(value, numbers.Integral):
          if value < 1:
              raise FrameError(
                  "Frame numbers must be integers; found %s"
                  % type(value)
              )
  
          return True
  
      return False
  
imports: import numbers
label_desc: Use image node_id 1 for calling a global function with example usage: is_frame_number(value) and returns: False, True