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Why 0 is true but false is 1 in the shell?
...l kinds of information about the failure - why it happened, how to fix it, etc. Having zero mean 'success' and non-zero mean failure lets you can check pretty easily for success, and investigate the particular error for more details if you want to. A lot of APIs and frameworks have a similar conve...
What is a mixin, and why are they useful?
...rMixin, Parent): pass and class NewChildN(NewBehaviorMixin, ChildN): pass, etc. (PS: Do you know a better way?)
– RayLuo
Oct 18 '16 at 0:57
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libcurl的使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...了source
2.编译。解压后进入curl的目录，直接执行 make all 就行。
3.等待编译结束后，可以查看目录结构。
curl/include/curl ： 头文件目录 （一般只要包含curl.h即可）
curl/lib/.lib/ ： lib文件目录（有libcurl.a和li...
Extracting just Month and Year separately from Pandas Datetime column
...column'].dt.to_period('M')
You could also use D for Day, 2M for 2 Months etc. for different sampling intervals, and in case one has time series data with time stamp, we can go for granular sampling intervals such as 45Min for 45 min, 15Min for 15 min sampling etc.
...
What are inline namespaces for?
...; : my_special_vector<MyOtherType> {
// ...
};
// ...etc...
} // namespace std
This is perfectly valid code where the user supplies its own implementation of a vector for a set of type where she apparently knows a more efficient implementation than the one found in (her copy ...
What is the difference between a field and a property?
...e can put logic in the Property also allows us to perform validation logic etc if we need it.
C# 3 has the possibly confusing notion of autoproperties. This allows us to simply define the Property and the C#3 compiler will generate the private field for us.
public class Person
{
private string _...
How do the likely/unlikely macros in the Linux kernel work and what is their benefit?
...nch prediction does work. Taken branches are problematic for instruction-fetch and decode even when they're predicted perfectly. Some CPUs statically predict branches that aren't in their history table, usually with assume not-taken for forward branches. Intel CPUs don't work that way: they don't...
Link to all Visual Studio $ variables
I was having a look at $(Configuration) , $(ProjectDir) etc. in Visual Studio 2008 for Prebuild events.
7 Answers
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Total memory used by Python process?
...tion that works for various operating systems, including Linux, Windows 7, etc.:
import os
import psutil
process = psutil.Process(os.getpid())
print(process.memory_info().rss) # in bytes
On my current Python 2.7 install with psutil 5.6.3, the last line should be
print(process.memory_info()[0...
从 !important 到关于叹号的 !一切 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...里面真的没叹号吗？
无法控制地跑题
Cut out all those exclamation points. An exclamation point is like laughing at your own jokes.
– F. Scott Fitzgerald
// 要是我，会更喜欢这样说：
Cut out all those exclamation points! An exclamation point is li...