python - 如何格式化符合 PEP8 的 python 断言语句？

Question

如何格式化符合 PEP8 的长断言语句？请忽略我的例子的人为性质。

def afunc(some_param_name):
    assert isinstance(some_param_name, SomeClassName), 'some_param_name must be an instance of SomeClassName, silly goose!'

不能用括号括起来，因为这会改变 assert 语句的行为，因为它是关键字，而不是内置函数。

Answer 1

请务必记住，PEP8 只是一个指南，even states that there are times when the rules should be broken .

But most importantly: know when to be inconsistent -- sometimes the style guide just doesn't apply.

考虑到这一点，我可能会用旧式续行来写这个:

def afunc(some_param_name):
    assert isinstance(some_param_name, SomeClassName), \ 
           'some_param_name must be an instance of SomeClassName, silly goose!'

如果您(或您的 linter)不满意，您可以随时这样做:

def afunc(some_param_name):
    assert isinstance(some_param_name, SomeClassName), ( 
           'some_param_name must be an instance of SomeClassName, silly goose!')

甚至:

def afunc(some_param_name):
    assert isinstance(some_param_name, SomeClassName), ( 
           'some_param_name must be an instance of SomeClassName, '
           'silly goose!')