Python、PEP8和多行dict格式

Question

我必须用Python声明一些dict。我写了这样一个代码：

class MegaClass(object):
    _activation_grad_classes = \
    {
        activation.ForwardStrictRELU: activation.BackwardStrictRELU,
        activation.ForwardLog: activation.BackwardLog,
        activation.ForwardSinCos: activation.BackwardSinCos
    }

得到一个PEP-8错误：E122 continuation line missing indentation or outdented。在

我怎样才能修好它？在

Answer 1

将左大括号放在赋值行上：

_activation_grad_classes = {
    activation.ForwardStrictRELU: activation.BackwardStrictRELU,
    activation.ForwardLog: activation.BackwardLog,
    activation.ForwardSinCos: activation.BackwardSinCos
}

在Python中，很少需要使用\来转义新行；相反，使用{..}、[..]和{}来跨多行对表达式进行分组。在