大约有 30,000 项符合查询结果（耗时：0.0472秒） [XML]
How should I print types like off_t and size_t?
... Visual Studio warns with this also "warning C4477: '_snprintf_s' : format string '%jd' requires an argument of type '__int64', but variadic argument 1 has type 'off_t'"... A truely portable way is printf("%lld\n", (long long)x);
– ericcurtin
Jun 13 '18 at 16:5...
How can I filter a Django query with a list of values?
...n you can't use =.
The sql query will be like SELECT * FROM mytable WHERE ids=[1, 3, 6, 7, 9] which is not true. You have to use in operator for this so you query will be like SELECT * FROM mytable WHERE ids in (1, 3, 6, 7, 9) for that Django provide __in operator.
...
What is the pythonic way to avoid default parameters that are empty lists?
...
Existing answers have already provided the direct solutions as asked for. However, since this is a very common pitfall for new Python programmers, it worth to add the explanation why python behaves this way, which is nicely summarized in "the Hitchhikers Guid...
How to determine if a decimal/double is an integer?
...k if there is anything past the decimal point.
public static void Main (string[] args)
{
decimal d = 3.1M;
Console.WriteLine((d % 1) == 0);
d = 3.0M;
Console.WriteLine((d % 1) == 0);
}
Output:
False
True
Update: As @Adrian Lopez mentioned below, comparison with a small value ...
Why does ASP.NET webforms need the Runat=“Server” attribute?
....
It continues:
If <runat=client> was required for all client-side tags, the parser would need to parse all tags and strip out the <runat=client> part.
He continues:
Currently,
If my guess is correct, the parser
simply ignores all text (tags or no
tags) unless it is a...
Hiding textarea resize handle in Safari
...
You can override the resize behaviour with CSS:
textarea
{
resize: none;
}
or just simply
<textarea style="resize: none;">TEXT TEXT TEXT</textarea>
Valid properties are: both, horizontal, vertical, none
...
Is JavaScript guaranteed to be single-threaded?
...d question. I'd love to say “yes”. I can't.
JavaScript is usually considered to have a single thread of execution visible to scripts(*), so that when your inline script, event listener or timeout is entered, you remain completely in control until you return from the end of your block or functio...
What do helper and helper_method do?
...pplication_controller.rb
def current_user
@current_user ||= User.find_by_id!(session[:user_id])
end
helper_method :current_user
the helper method on the other hand, is for importing an entire helper to the views provided by the controller (and it's inherited controllers). What this means is doin...
Programmatically access currency exchange rates [closed]
... . '=?' . $to_code;
$response = file_get_contents($temp);
$result_string = explode('"', $response);
$final_result = $result_string['3'];
$float_result = preg_replace("/[^0-9\.]/", '', $full_result);
return $float_result;
}
I'm sure it's far from the most elegant way to do t...
Get the current year in JavaScript
...ear()
// returns the current year
Hijacking the accepted answer to provide some basic example context like a footer that always shows the current year:
<footer>
&copy; <span id="year"></span>
</footer>
Somewhere else executed after the HTML above has been loade...