code: def check_dtype(array, allowed):
      
      if not hasattr(allowed, "__iter__"):
          allowed = [allowed,]
      if array.dtype not in allowed:
          raise(TypeError(
              "Invalid dtype {}. Allowed dtype(s): {}".format(array.dtype, allowed)))
docs: Raises TypeError if the array is not of an allowed dtype.
  
      :param array: array whose dtype is to be checked
      :param allowed: instance or list of allowed dtypes