大约有 44,000 项符合查询结果（耗时：0.0496秒） [XML]
Python argparse: default value or specified value
...ngs? I have a dilemma with differentiation of "" (empty string as default) and "" (empty string as entered by user). In the code for now I'm using the default and since I need to do some ops, I have something like this self.foo = (args.bar or some_else_source).upper(). It will break on None object A...
Insert into … values ( SELECT … FROM … )
... the SQL engine of the day ( MySQL , Oracle , SQL Server , Informix , and DB2 ).
26 Answers
...
How do I pass a variable by reference?
...n seems unclear about whether parameters are passed by reference or value, and the following code produces the unchanged value 'Original'
...
iOS 7 status bar back to iOS 6 default style in iPhone app?
...ost I wrote, but here is the full rundown on status bars, navigation bars, and container view controllers on iOS 7:
There is no way to preserve the iOS 6 style status bar layout. The status bar will always overlap your application on iOS 7
Do not confuse status bar appearance with status bar layou...
How do I get current date/time on the Windows command line in a suitable format for usage in a file/
...
On my system %TIME% returns values like " 0:01:15" and " 3:15:12" and the %%a%%b code in the answer gives a leading space like " 001" and " 315". To get a four digit hhmm use this: For /f "tokens=1-2 delims=/: " %%a in ("%TIME%") do (if %%a LSS 10 (set mytime=0%%a%%b) else (s...
Using “super” in C++
...
Bjarne Stroustrup mentions in Design and Evolution of C++ that super as a keyword was considered by the ISO C++ Standards committee the first time C++ was standardized.
Dag Bruck proposed this extension, calling the base class "inherited." The proposal mention...
What are the rules for calling the superclass constructor?
...bar
}
};
More info on the constructor's initialization list here and here.
share
|
improve this answer
|
follow
|
...
Visual Studio support for new C / C++ standards?
I keep reading about C99 and C++11 and all these totally sweet things that are getting added to the language standard that might be nice to use someday. However, we currently languish in the land of writing C++ in Visual Studio.
...
What's the proper way to install pip, virtualenv, and distribute for Python?
...4376 , I recommended using ez_setup so that you could then install pip and virtualenv as follows:
15 Answers
...
Unable to locate tools.jar
...
Yes, you've downloaded and installed the Java Runtime Environment (JRE) instead of the Java Development Kit (JDK). The latter has the tools.jar, java.exe, javac.exe, etc.
...