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理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...ows with is evaluated, the __enter__() function on the resulting object is called. The value returned by this function is assigned to the variable following as. After every statement in the block is evaluated, the __exit__() function is called.
紧跟with后面的语句被求值后，返回对象...
How to spawn a process and capture its STDOUT in .NET? [duplicate]
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This is wrong. To make this work, you'd need first to call BeginOutputReadLine which starts to read the stdOut stream. You could read the stream directly too. Unfortunately the implementation creates the IO streams only once the process is started. Calling BeginOutputReadLine or...
How to execute shell command in Javascript
... Except for one thing. You'll get the error "child is not a function". The call to exec() executes the command - no need to call child(). Unfortunately, the callback isn't called whenever the child process has something to output - it is called only when the child process exits. Sometimes that's OK ...
.htaccess rewrite to redirect root URL to subdirectory
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Just recently I spent a lot of time debugging why this didn't work on a site in Ubuntu Apache 2.4.7. Rewrite debugging showed the rule being hit and generating an INTERNAL REDIRECT. Then it seemed to just park that and look for an index page. Turns out that if mod_dir is enabled A...
Why can't static methods be abstract in Java?
... consequence of Java not allowing static methods to be abstract. It means "callable on the class." (It should mean "callable only on the class" but that's another issue.) If Java supported abstract static methods I'd expect it to mean that the method 1) must be implemented by subclasses, and 2) is a...
sys.argv[1] meaning in script
... more tutorial level.
For every invocation of Python, sys.argv is automatically a list of strings representing the arguments (as separated by spaces) on the command-line. The name comes from the C programming convention in which argv and argc represent the command line arguments.
You'll want to le...
Stack smashing detected
... func();
}
The compiler, (in this case gcc) adds protection variables (called canaries) which have known values. An input string of size greater than 10 causes corruption of this variable resulting in SIGABRT to terminate the program.
To get some insight, you can try disabling this protection o...
change cursor to finger pointer
...actually the default behavior for links. You must have either somehow overridden it elsewhere in your CSS, or there's no href attribute in there (it's missing from your example).
share
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improve thi...
What is @ModelAttribute in Spring MVC?
...M in MVC ;)
so let's say we have a form with a form backing object that is called "Person"
Then you can have Spring MVC supply this object to a Controller method by using the @ModelAttribute annotation:
public String processForm(@ModelAttribute("person") Person person){
person.getStuff();
}
O...
Fatal error: use of unimplemented initializer 'init(coder:)' for class
...d is required because instantiating a UIViewController from a UIStoryboard calls it.
To see how we initialize a UIViewController from a UIStoryboard, please take a look here
Why is this not a problem with Objective-C?
Because Objective-C automatically inherits all the required UIViewController initi...