我如何在我的职能上执行Samurai 原则(return victorious, or not at all)?
return <value> if <bool> else raise <exception>
我如何在我的职能上执行Samurai 原则(return victorious, or not at all)?
return <value> if <bool> else raise <exception>
在线/永久<代码>if为表述,而不是说明。 您的尝试意味着“如果包裹、回报价值,则将<条码>的表述条码>的结果退回”,因为<条码>的例外情况<>本身不是表述。
这行不通,你也不想。 明确:
if not bool:
raise MyException
return value
如果你绝对希望以某种表述方式打上<条码>。
def raiser(ex): raise ex
return <value> if <bool> else raiser(<exception>)
这一“试图”返还<代码>iserra()的回报价值,如果该功能没有无条件的<代码>raise,则该数值为<代码>None。
我愿谈谈这一说法,因此,你强调,该成员必须像合同一样。
>>> def foo(self):
... assert self.value, "Not Found"
... return self.value
一种途径是,在一名实习生中使用exec
:
def raising_ternary(x):
return x if x else exec("raise Exception( its just not true )")
您可以看到用<条码>将其命名。 真正的代码>将使用密码。 单字母代码>将提出例外情况:
>>> def raising_ternary(x):
... return x if x else exec("raise Exception( its just not true )")
...
>>> raising_ternary(True)
True
>>> raising_ternary(False)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 2, in raising_ternary
File "<string>", line 1, in <module>
Exception: its just not true
>>>
我们可以单独测试ool:
if expr: raise exception( foo )
return val
这样,你就可以提前测试<代码>expr。
Is there a way to force Django models to pass a field to a MySQL function every time the model data is read or loaded? To clarify what I mean in SQL, I want the Django model to produce something like ...
I am looking for an enterprise tasks scheduler for python, like quartz is for Java. Requirements: Persistent: if the process restarts or the machine restarts, then all the jobs must stay there and ...
Given the following list that contains some duplicate and some unique dictionaries, what is the best method to remove unique dictionaries first, then reduce the duplicate dictionaries to single ...
Simple enough question: I m using python random module to generate random integers. I want to know what is the suggested value to use with the random.seed() function? Currently I am letting this ...
I m using PyDev under Eclipse to write some Jython code. I ve got numerous instances where I need to do something like this: import com.work.project.component.client.Interface.ISubInterface as ...
Python s paster serve app.ini is taking longer than I would like to be ready for the first request. I know how to profile requests with middleware, but how do I profile the initialization time? I ...
Our business currently has an online store and recently we ve been offering free specials to our customers. Right now, we simply display the special and give the buyer a notice stating we will add the ...
I m trying to convert a Python dictionary into a Python list, in order to perform some calculations. #My dictionary dict = {} dict[ Capital ]="London" dict[ Food ]="Fish&Chips" dict[ 2012 ]="...