Python：lamda与if / else

Question

我试图用if / else代替lambda self.status: partial if max_refundable == amount else self.status = refunded以使其成一行。但是，它不能按预期工作。有人知道问题出在哪里吗？

if max_refundable == amount:
    self.status = partial
else:
    self.status = refunded

Answer 1

因为语法无效

lambda self.status: partial if max_refundable == amount else self.status = refunded

等价于

def _lambda_func_(self.status):
    return partial if max_refundable == amount else self.status = refunded

这不是您想要的（self.status不是有效的参数名称）。您不需要功能，只需

self.status = partial if max_refundable == amount else refunded

Answer 2

语法如下：

a = 1
b = 3
a = a+b if a == 2 else b

在您的情况下，它看起来像这样：

self.status = partial if max_refundable == amount else refunded