大约有 44,000 项符合查询结果（耗时：0.0316秒） [XML]
List to array conversion to use ravel() function
... wanted a way to do this without using an extra module. First turn list to string, then append to an array:
dataset_list = ''.join(input_list)
dataset_array = []
for item in dataset_list.split(';'): # comma, or other
dataset_array.append(item)
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if a ngSrc path resolves to a 404, is there a way to fallback to a default?
... Works well if the url is broken (404), but if it's an empty string ng-src silently swallows the error.
– Stephen Patten
Sep 18 '13 at 18:43
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Printing newlines with print() in R
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An advantage is that you don't have to remember to append a "\n" to the string passed to cat() to get a newline after your message. E.g. compare the above to the same cat() output:
> cat("File not supplied.\nUsage: ./program F=filename")
File not supplied.
Usage: ./program F=filename>
an...
What are the mechanics of short string optimization in libc++?
This answer gives a nice high-level overview of short string optimization (SSO). However, I would like to know in more detail how it works in practice, specifically in the libc++ implementation:
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SELECT * FROM X WHERE id IN (…) with Dapper ORM
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Dapper supports this directly. For example...
string sql = "SELECT * FROM SomeTable WHERE id IN @ids"
var results = conn.Query(sql, new { ids = new[] { 1, 2, 3, 4, 5 }});
share
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Return anonymous type results?
...:
public class DogWithBreed
{
public Dog Dog { get; set; }
public string BreedName { get; set; }
}
public IQueryable<DogWithBreed> GetDogsWithBreedNames()
{
var db = new DogDataContext(ConnectString);
var result = from d in db.Dogs
join b in db.Breeds on d.B...
Call two functions from same onclick [duplicate]
...n overload that translates as one cell in the stack and half a millisecond extra for processing. It is more than worth it for the gain in readability and easy of maintenance. Imagine that in the future you have to add three extra methods, with conditional logic.
– Renan
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Is there a difference between using a dict literal and a dict constructor?
...o be extra nice. Just as it always seems to offer to convert single-quoted strings into double-quoted -- for no apparent reason.
– maligree
Jul 7 '11 at 12:53
1
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What's Up with Logging in Java? [closed]
...event is serialized using the unchanged message pattern + the arguments as Strings. I guess it just depends how you define "effectively" though. It would certainly emit the same message (at least if entry and object are the same ;)) so please forgive my nitpicking.
– Huxi
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Can virtual functions have default parameters?
...ctly the same in almost every way except default visibility.
#include <string>
#include <sstream>
#include <iostream>
#include <iomanip>
using std::stringstream;
using std::string;
using std::cout;
using std::endl;
struct Base { virtual string Speak(int n = 42); };
struct ...