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How do I execute a string containing Python code in Python?
... setattr(x, s, 42) is the right syntax. Surprised it took so long for that error to be caught. Anyway, the point is that getattr and setattr are an alternative to exec when all you want is to get an arbitrary member, looked up by string.
– ShreevatsaR
Oct 11 '1...
Reference: mod_rewrite, URL rewriting and “pretty links” explained
...ur RewriteRules still wouldn't work anyway.
It's meant to prevent HTTP 500 errors. What it usually accomplishes is gracing your users with HTTP 404 errors instead. (Not so much more user-friendly if you think about it.)
Practically it just suppresses the more useful log entries, or server notificati...
What exactly are DLL files, and how do they work?
...elete or rename the DLL and watch how the loader will report a missing DLL error when you try to run the executable.
Hence the name Dynamic Link Library, parts of the linking process is being done dynamically at run time by the executable loader.
One a final note, if you don't link to the DLL then...
C++静态和多态，亦敌亦友 - C/C++ - 清泛网 - 专注C/C++及内核技术
...代码编译不能通过。显示如下信息：
stawithvir.cpp:19:17: error: ‘static void DerivedAgain::foo()’ cannot be declared
stawithvir.cpp:13:10: error: since ‘virtual void Derived::foo()’ declared in base class
很明显，编译不能通过的原因，是在De...
Git rebase: conflicts keep blocking progress
...ory clean)
Ah ah, there is no change. If you read in detail the previous error message, git informed us of this and recommended to use git rebase --skip. He told us "If there is nothing left to stage, chances are that something else already introduced the same changes; you might want to skip this ...
if, elif, else statement issues in Bash
...if[). Only after having parsed the statement it would be executed (and an error message like elif[: command not found would be output).
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Get current clipboard content? [closed]
...nsole.log('Pasted content: ', text);
})
.catch(err => {
console.error('Failed to read clipboard contents: ', err);
});
Or with async syntax:
const text = await navigator.clipboard.readText();
Keep in mind that this will prompt the user with a permission request dialog box, so no funny...
Disable browser's back button
... browser, but you can make it so that your application breaks (displays an error message, requiring the user to start over) if the user goes back.
One approach I have seen for doing this is to pass a token on every URL within the application, and within every form. The token is regenerated on ever...
SQL how to increase or decrease one for a int column in one command
...at is, you try to do the creation first. If it's already there, ignore the error. Otherwise you create it with a 0 value.
Then do the update which will work correctly whether or not:
the row originally existed.
someone updated it between your insert and update.
It's not a single instruction and...
What is the scope of variables in JavaScript?
...perties on the global object.
Examples
The following will throw a ReferenceError because the namesx, y, and z have no meaning outside of the function f.
function f() {
var x = 1
let y = 1
const z = 1
}
console.log(typeof x) // undefined (because var has function scope!)
console.log(t...