大约有 10,710 项符合查询结果（耗时：0.0256秒） [XML]
Using python's eval() vs. ast.literal_eval()?
I have a situation with some code where eval() came up as a possible solution. Now I have never had
to use eval() before but, I have come across plenty of information about the potential
danger it can cause. That said, I'm very wary about using it.
...
Why does “pip install” inside Python raise a SyntaxError?
... not the Python interpreter. It is a program that installs modules, so you can use them from Python. Once you have installed the module, then you can open the Python shell and do import selenium.
The Python shell is not a command line, it is an interactive interpreter. You type Python code into it,...
How does inline Javascript (in HTML) work?
...ick", function(event) {
(function(event) {
alert(this);
}).call(document.getElementById('click_me'), event);
});
</script>
Inline event handlers set this equal to the target of the event.
You can also use anonymous function in inline script
<a href="#" onclick="(function(...
How to make a variadic macro (variable number of arguments)
...he reason for ## before VA_ARGS is that it swallows the preceding comma in case the variable-argument list is empty, eg. FOO("a") expands to printf("a"). This is an extension of gcc (and vc++, maybe), C99 requires at least one argument to be present in place of the ellipsis.
– ...
Subset of rows containing NA (missing) values in a chosen column of a data frame
...d. This should do it:
new_DF <- DF[rowSums(is.na(DF)) > 0,]
or in case you want to check a particular column, you can also use
new_DF <- DF[is.na(DF$Var),]
In case you have NA character values, first run
Df[Df=='NA'] <- NA
to replace them with missing values.
...
Installing Apple's Network Link Conditioner Tool
...worked except when trying to turn on the network link conditioner. In this case the window disappears and there is not throttling of the internet speed. Looking through the internet for this problem I found not solution. There were suggestions to add the files : /system/library/launchdaemons/com.app...
Replace only text inside a div using jquery
...
this is worked but how can sure to executed or not ? can i run exception if blank or tag changed? in unsuccessful bindings because this div created by code.from REST or database
– saber tabatabaee yazdi
May 1 ...
AWS Error Message: A conflicting conditional operation is currently in progress against this resourc
...
I just ran into the same situation. I'll post back if I can create my bucket within the next hour or so.
– AJB
May 17 '14 at 19:42
27
...
Amazon S3 Change file download name
...e:
If there is only ever one "user filename" for each S3 object, then you can set the Content-Disposition header on your s3 file to set the downloading filename:
Content-Disposition: attachment; filename=foo.bar
For the sake of fairness I'd like to mention that it was not me to provide the right a...
JavaScript by reference vs. by value [duplicate]
... or primitive referenced by the original a is unchanged.
a = 3;
// Calling b.push changes its properties - it adds
// a new property b[b.length] with the value "foo".
// So the object referenced by b has been changed.
b.push("foo");
// The "first" property of argument c has b...