在Python中，您通常如何处理长代码换行

Question

我有一个长代码，如下所示：

def to_representation(self, instance):
res = super().to_representation(instance)
res['receiver_phone_num'] = get_encryption_phone_num(instance.receiver_phone_num) if instance.receiver_phone_num else None
return res

第三行太长了，我很难在哪里休息一下，开始一行新的代码，这样可以使代码更可读、更清晰。

我试过这个：

res['receiver_phone_num'] = get_encryption_phone_num(
instance.receiver_phone_num
) if instance.receiver_phone_num else None

和

res['receiver_phone_num'] = get_encryption_phone_num(instance.receiver_phone_num)
if instance.receiver_phone_num else None

和

res['receiver_phone_num'] = get_encryption_phone_num(
instance.receiver_phone_num) if instance.receiver_phone_num else None

我更喜欢第一种换行的风格。你喜欢哪一种，或者你有其他看起来清晰漂亮的断线款式吗，请给我看看。

Answer 1

由于get_encryption_phone_num(instance.receiver_phone_num)行在表达式中占用了大量空间，为了可读性，最好将其值分配给另一个变量，然后在表达式中使用该变量。

encryption_phone_num = get_encryption_phone_num(instance.receiver_phone_num)

就表达式的缩进而言，可以使用以下任意一种：

res['receiver_phone_num'] = (encryption_phone_num
if instance.receiver_phone_num
else None)

或

res['receiver_phone_num'] = (
encryption_phone_num
if instance.receiver_phone_num
else None
)