class_docstr: A GOA class, inherited from Optimizer.
  
  This is the designed class to define GOA-related
  variables and methods.
  
  References:
      S. Saremi, S. Mirjalili and A. Lewis. Grasshopper Optimisation Algorithm: Theory and application.
      Advances in Engineering Software (2017).
code: def l(self, l: float) -> None:
      if not isinstance(l, (float, int)):
          raise e.TypeError("`l` should be a float or integer")
      if l < 0:
          raise e.ValueError("`l` should be >= 0")
  
      self._l = l
  
imports: import copy
  from typing import Any, Dict, Optional
  import numpy
  import opytimizer.math.general
  import opytimizer.utils.constant
  import opytimizer.utils.exception
  from opytimizer.core import Optimizer
  from opytimizer.core.function import Function
  from opytimizer.core.space import Space
  from opytimizer.utils import logging
label_desc: Use image node_id 9 for calling the GOA obj's underlying member method code with example usage: obj.l(l) without return types