大约有 45,000 项符合查询结果（耗时：0.0571秒） [XML]
Generate 'n' unique random numbers within a range [duplicate]
...answered Apr 3 '14 at 15:34
Two-Bit AlchemistTwo-Bit Alchemist
14.4k44 gold badges3535 silver badges7474 bronze badges
...
Efficiently checking if arbitrary object is NaN in Python / numpy / pandas?
...you won't need to specify the dtype)
In [24]: s = Series([Timestamp('20130101'),np.nan,Timestamp('20130102 9:30')],dtype='M8[ns]')
In [25]: s
Out[25]:
0 2013-01-01 00:00:00
1 NaT
2 2013-01-02 09:30:00
dtype: datetime64[ns]``
In [26]: pd.isnull(s)
Out[26]:
0 False
1 ...
How can I check if a URL exists via PHP?
....*)?$/i', $url) ){
return false;
}
// the next bit could be slow:
if(getHttpResponseCode_using_curl($url) != 200){
// if(getHttpResponseCode_using_getheaders($url) != 200){ // use this one if you cant use curl
return false;
}
// a...
void in C# generics?
...
I like the idea by Aleksey Bykov above, but it could be simplified a bit
public sealed class Nothing {
public static Nothing AtAll { get { return null; } }
}
As I see no apparent reason why Nothing.AtAll could not just give null
The same idea (or the one by Jeppe Stig Nielsen) is also ...
Placeholder in IE9
...
http://bavotasan.com/2011/html5-placeholder-jquery-fix/
I've adopted it a bit to work only with browsers under IE10
<!DOCTYPE html>
<!--[if lt IE 7]><html class="no-js lt-ie10 lt-ie9 lt-ie8 lt-ie7" lang="en"> <![endif]-->
<!--[if IE 7]><html class="no-js lt-ie10 lt...
Notification when a file changes?
... Majid
11.6k1111 gold badges6767 silver badges105105 bronze badges
answered Apr 6 '09 at 14:34
SheaShea
10.6k22 gold badges1...
How to normalize a NumPy array to within a certain range?
...zation.
– Alan Turing
May 20 '18 at 10:48
Thanks for pointing it out @AlanTuring that was very sloppy. The code, as po...
Is it possible dynamically to add String to String.xml in Android?
...
1064
Formatting and Styling
Yes, see the following from String Resources: Formatting and Styling
...
Emulator error: This AVD's configuration is missing a kernel file
...ChrLippChrLipp
14.8k99 gold badges6868 silver badges104104 bronze badges
1
...
Access denied for user 'test'@'localhost' (using password: YES) except root user
...wered Jan 7 '16 at 2:31
4af2e9eb64af2e9eb6
62222 gold badges77 silver badges1818 bronze badges
...