大约有 40,000 项符合查询结果（耗时：0.0441秒） [XML]
Static Indexers?
...ure and fragmentation in some environments, 2) the extra characters wasted by new () could have been used for qualifier name of a singleton instead, like .Current
– Lawrence Ward
Mar 10 '14 at 13:22
...
MySQL: Insert record if not exists in table
...not actually suggesting that you do this, as the UNIQUE index as suggested by Piskvor and others is a far better way to do it, but you can actually do what you were attempting:
CREATE TABLE `table_listnames` (
`id` int(11) NOT NULL auto_increment,
`name` varchar(255) NOT NULL,
`address` varch...
Detect and exclude outliers in Pandas data frame
...
This answer is similar to that provided by @tanemaki, but uses a lambda expression instead of scipy stats.
df = pd.DataFrame(np.random.randn(100, 3), columns=list('ABC'))
df[df.apply(lambda x: np.abs(x - x.mean()) / x.std() < 3).all(axis=1)]
To filter the Da...
How can I check if an ip is in a network in Python?
...will fail on architectures where 'L' unpacks to something different than 4 bytes, regardless of endianness.
– Rafał Dowgird
May 4 '09 at 15:33
5
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Why am I getting this error: No mapping specified for the following EntitySet/AssociationSet - Entit
...with a number 1 at the end (such as MyEntity1 and a MyEntity) as confirmed by the edmx model browser. Something about the two entities together confused the processing.
Removal of the table and re-adding it fixed it.
Note that if TFS is hooked up, then do a check-in of the edmx in after the dele...
GitHub relative link in Markdown file
...pdate December 20th, 2011:
The GitHub markup issue 84 is currently closed by technoweenie, with the comment:
We tried adding a <base> tag for this, but it causes problems with other relative links on the site.
October 12th, 2011:
If you look at the raw source of the README.md of Mark...
Length of string in bash
...rect answer, I would like to show the difference between string length and byte length:
myvar='Généralités'
chrlen=${#myvar}
oLang=$LANG oLcAll=$LC_ALL
LANG=C LC_ALL=C
bytlen=${#myvar}
LANG=$oLang LC_ALL=$oLcAll
printf "%s is %d char len, but %d bytes len.\n" "${myvar}" $chrlen $bytlen
will re...
How do you iterate through every file/directory recursively in standard C++?
...Actually it does work on VC++ if you get a port of dirent.h for visual C++ by Tony Ronkko. It's FOSS. I just tried this and it works.
– user1741137
May 2 '17 at 10:49
add a co...
How to join int[] to a character separated string in .NET?
...y of converting these in to a single string where the number are separated by a character".
The easiest way is:
int[] numbers = new int[] { 2,3,6,7 };
string number_string = string.Join(",", numbers);
// do whatever you want with your exciting new number string
EDIT: This only works in .NET 4.0+...
Modelling an elevator using Object-Oriented Analysis and Design [closed]
...stem" that would have load balancing (e.g., send more idle elevators to lobby in morning). If that is the case, the design will include a whole subsystem with really fun design.
A full design is obviously too much to present here and there are many altenatives. The breadth is also not clear. In a...