大约有 23,000 项符合查询结果（耗时：0.0447秒） [XML]
How to solve error “Missing `secret_key_base` for 'production' environment” (Rails 4.1)
...icorn.log file I found this error message:
app error: Missing `secret_key_base` for 'production' environment, set this value in `config/secrets.yml` (RuntimeError)
After some research I found out that Rails 4.1 changed the way to manage the secret_key, so if you read the secrets.yml file located ...
How can I specify the base for Math.log() in JavaScript?
I need a log function for JavaScript, but it needs to be base 10. I can't see any listing for this, so I'm assuming it's not possible. Are there any math wizards out there who know a solution for this?
...
Why does parseInt(1/0, 19) return 18?
...nfinity". So it works the same as if you asked it to convert "Infinity" in base 19 to decimal.
Here are the digits in base 19 along with their decimal values:
Base 19 Base 10 (decimal)
---------------------------
0 0
1 1
2 2
3 3
4 ...
Virtual/pure virtual explained
...han just the level at which it was created. Therefore if one method of the base class calls a virtual method, the version defined in the derived class will be used instead of the version defined in the base class.
This is in contrast to non-virtual functions, which can still be overridden in a der...
List all base classes in a hierarchy of given class?
... (whether it is a new-style class or not), how do you generate all the base classes - anywhere in the inheritance hierarchy - it issubclass of?
...
Is it possible to make abstract classes in Python?
...rties as using the abc module does. You can still instantiate the abstract base class itself, and you won't find your mistake until you call the abstract method at runtime.
But if you're dealing with a small set of simple classes, maybe with just a few abstract methods, this approach is a little e...
Method Resolution Order (MRO) in new-style classes?
...lution order is D - B - A - C - A : so when looking up D.x, A is the first base in resolution order to solve it, thereby hiding the definition in C. While:
>>> class A(object): x = 'a'
...
>>> class B(A): pass
...
>>> class C(A): x = 'c'
...
>>> class D(B, C)...
Is Big O(logn) log base e?
...ically noted as O(logn). With a lowercase 'l' in log, does this imply log base e (n) as described by the natural logarithm? Sorry for the simple question but I've always had trouble distinguishing between the different implied logarithms.
...
Log to the base 2 in python
How should I compute log to the base two in python. Eg. I have this equation where I am using log base 2
11 Answers
...
Can virtual functions have default parameters?
If I declare a base class (or interface class) and specify a default value for one or more of its parameters, do the derived classes have to specify the same defaults and if not, which defaults will manifest in the derived classes?
...