大约有 40,000 项符合查询结果(耗时:0.0378秒) [XML]

https://stackoverflow.com/ques... 

Priority queue in .Net [closed]

...st int GrowFactor = 2; private const int MinGrow = 1; private int _capacity = InitialCapacity; private T[] _heap = new T[InitialCapacity]; private int _tail = 0; public int Count { get { return _tail; } } public int Capacity { get { return _capacity; } } protected Comp...
https://stackoverflow.com/ques... 

Why is it slower to iterate over a small string than a small list?

...sions. I'll examine the compiled code. For Python 3: import dis def list_iterate(): [item for item in ["a", "b", "c"]] dis.dis(list_iterate) #>>> 4 0 LOAD_CONST 1 (<code object <listcomp> at 0x7f4d06b118a0, file "", line 4>) #>>> ...
https://stackoverflow.com/ques... 

How can i query for null values in entity framework?

...].[Foos] AS [Extent1] WHERE (CASE WHEN (([Extent1].[ProductID] = 1 /* @p__linq__0 */) AND (NULL /* @p__linq__1 */ IS NOT NULL)) THEN CASE WHEN ([Extent1].[ProductStyleID] = NULL /* @p__linq__2 */) THEN cast(1 as bit) WHEN ([Extent1].[ProductStyleID] <> NULL /* @p__li...
https://stackoverflow.com/ques... 

Why return NotImplemented instead of raising NotImplementedError

... It's because __lt__() and related comparison methods are quite commonly used indirectly in list sorts and such. Sometimes the algorithm will choose to try another way or pick a default winner. Raising an exception would break out of the s...
https://stackoverflow.com/ques... 

How to avoid explicit 'self' in Python?

...e, and always know whether you are accessing a member or not: class A(some_function()): def f(self): self.member = 42 self.method() That's the complete code! (some_function returns the type used as a base.) Another, where the methods of a class are dynamically composed: class B(objec...
https://stackoverflow.com/ques... 

Save classifier to disk in scikit-learn

... continue your example: import cPickle # save the classifier with open('my_dumped_classifier.pkl', 'wb') as fid: cPickle.dump(gnb, fid) # load it again with open('my_dumped_classifier.pkl', 'rb') as fid: gnb_loaded = cPickle.load(fid) ...
https://stackoverflow.com/ques... 

Do try/catch blocks hurt performance when exceptions are not thrown?

...TryCatch() cil managed { // Code size 32 (0x20) .maxstack 8 IL_0000: nop IL_0001: ldstr "SIN(1) = {0} - No Try/Catch" IL_0006: ldc.r8 1. IL_000f: call float64 [mscorlib]System.Math::Sin(float64) IL_0014: box [mscorlib]System.Double IL_0019: call ...
https://stackoverflow.com/ques... 

__FILE__, __LINE__, and __FUNCTION__ usage in C++

...r C++ compiler supports them, is there any particular reason not to use __FILE__ , __LINE__ and __FUNCTION__ for logging and debugging purposes? ...
https://stackoverflow.com/ques... 

How to find out which package version is loaded in R?

...plish that. > sessionInfo() R version 2.15.0 (2012-03-30) Platform: x86_64-pc-linux-gnu (64-bit) locale: [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 LC_PAPER=C ...
https://stackoverflow.com/ques... 

Why is early return slower than else?

...e a theory for you. I tried your code and get the same of results, without_else() is repeatedly slightly slower than with_else(): >>> T(lambda : without_else()).repeat() [0.42015745017874906, 0.3188967452567226, 0.31984281521812363] >>> T(lambda : with_else()).repeat() [0.3600984...