docs: def static(cls):
    r"""Converts the given class into a static one, by changing all the methods of it into static methods.
  
    Args:
      cls (class): The class to be converted.
    """
    for attr in dir(cls):
        im_func = getattr(getattr(cls, attr), 'im_func', None)
        if im_func:
          setattr(cls, attr, staticmethod(im_func))
  
    return cls