def METHOD_NAME(self):
    """Patch callables according to the config file.
    Call once at startup but after main() has started running. Do not
    call at module init or you will likely get circular dependencies.
    This function potentially imports many modules.
    """
    if self.config_path is None:
        return  # disabled
    assert self.patched is False
    self._patch_callables()
    self.patched = True