unsupported operand type(s) for +: 'builtin_function_or_method' and 'builtin_function_or_method'

报错：unsupported operand type(s) for +: 'builtin_function_or_method' and 'builtin_function_or_method'

贴一下源代码,现在的报错是说你是直接将两个函数相加了