parameters: (self, func)
docstring: Initialize.
  
      Args:
        func: callable that takes one parameter and returns a bool
docstring_summary: Initialize.
docstring_tokens: Initialize .
function: def __init__(self, func):
      """Initialize.
  
      Args:
        func: callable that takes one parameter and returns a bool
      """
  
      self._func = func
function_tokens: def __init__ ( self , func ) : self . _func = func