大约有 16,000 项符合查询结果（耗时：0.0339秒） [XML]
How to call a Parent Class's method from Child Class in Python?
When creating a simple object hierarchy in Python, I'd like to be able to invoke methods of the parent class from a derived class. In Perl and Java, there is a keyword for this ( super ). In Perl, I might do this:
...
How can I create a copy of an object in Python?
I would like to create a copy of an object. I want the new object to possess all properties of the old object (values of the fields). But I want to have independent objects. So, if I change values of the fields of the new object, the old object should not be affected by that.
...
What's the difference between deadlock and livelock?
Can somebody please explain with examples (of code) what is the difference between deadlock and livelock ?
7 Answers
...
Sorting multiple keys with Unix sort
I have potentially large files that need to be sorted by 1-n keys. Some of these keys might be numeric and some of them might not be. This is a fixed-width columnar file so there are no delimiters.
...
Git submodule update
I'm not clear on what the following means (from the Git submodule update documentation):
4 Answers
...
Get list from pandas DataFrame column headers
...rame will come from user input so I won't know how many columns there will be or what they will be called.
19 Answers
...
jQuery: select an element's class and id at the same time?
...
Tintin81
8,5361717 gold badges6262 silver badges131131 bronze badges
answered Dec 22 '09 at 5:24
cletuscletus
...
Concatenating two std::vectors
...
vector1.insert( vector1.end(), vector2.begin(), vector2.end() );
share
|
improve this answer
|
follow
|
...
PostgreSQL return result set as JSON array?
...
TL;DR
SELECT json_agg(t) FROM t
for a JSON array of objects, and
SELECT
json_build_object(
'a', json_agg(t.a),
'b', json_agg(t.b)
)
FROM t
for a JSON object of arrays.
List of objects
This section describes how to generate a JSON array of objects, ...
how to read all files inside particular folder
...
using System.IO;
...
foreach (string file in Directory.EnumerateFiles(folderPath, "*.xml"))
{
string contents = File.ReadAllText(file);
}
Note the above uses a .NET 4.0 feature; in previous versions replace EnumerateFiles w...