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Create numpy matrix filled with NaNs
... it can be assumed to have been garbage collected). On immutable data like strings, a copy is returned, because you can't operate in-place. Pandas can do both.
– flutefreak7
Jun 2 '16 at 21:26
...
API pagination best practices
...e if you’ve a lot of local cached records suppose 500, then your request string will be too long like this:-
{
"isRefresh" : false,
"cached" : ["id1","id2","id3","id4","id5","id6","id7","id8","id9","id10",………,"id500"]//Too long request
}
Approach 2: When server is smart en...
What's wrong with cplusplus.com?
...
http://www.cplusplus.com/reference/clibrary/cstring/strncpy/
Fails to mention that "If copying takes place between objects that overlap, the behavior is undefined." (4.11.2.4 in the C89 standard. I don't have a copy to hand of C90, which is what C++03 actually refers t...
C#中数组、ArrayList和List三者的区别 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的索引速度非常快，而且赋值与修改元素也很简单。
string[] s=new string[2];
//赋值
s[0]="a";
s[1]="b";
//修改
s[1]="a1";
但是数组存在一些不足的地方。在数组的两个数据间插入数据是很麻烦的，而且在声明数组的时候必...
DateTime.Parse：用DateTime的ParseExact自定义解析日期时间 - 更多技术 - ...
...eTime的ParseExact自定义解析日期时间用最常用的DateTime.Parse(string dateTimeStr)需要标准格式的时间，无法转换，问题就在于这个自定义格式上。主要问题是这个时间不是标准...用最常用的DateTime.Parse(string dateTimeStr)解析时间字符串需要...
std::string截取字符串，截取ip:port - c++1y / stl - 清泛IT社区，为创新赋能！
std::string ip("127.0.0.1:8888");
int index = ip.find_last_of(':');
// 获取ip
ip.substr(0, index).c_str();
// 获取port
ip.substr(index + 1).c_str();
C++ protobuf使用入门实例 - C/C++ - 清泛网 - 专注C/C++及内核技术
...t.
message Test {
// Unordered map of dynamically typed values.
map<string, TestValue> fields = 1;
}
// `Value` represents a dynamically typed value which can be either
// null, a number, a string, a boolean, a recursive struct value, or a
// list of values. A producer of value is expec...
Cannot change column used in a foreign key constraint
...sion. The size and sign of integer types
must be the same. The length of string types need not be the same. For
nonbinary (character) string columns, the character set and collation
must be the same.
share
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...
How to pause a YouTube player when hiding the iframe?
...enablejsapi") === -1) {
// ...check whether there is already a query string or not:
// (ie. whether to prefix "enablejsapi" with a "?" or an "&")
var prefix = (iframes[i].src.indexOf("?") === -1) ? "?" : "&amp;";
iframes[i].src += prefix + "enablejsapi=true";
}
...
How do you redirect to a page using the POST verb?
...
}
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Index(int someValue, string anotherValue) {
// would probably do something non-trivial here with the param values
return View();
}
That works easily and there is no funny business really going on - this allows you to maintain the fact tha...