大约有 20,000 项符合查询结果（耗时：0.0341秒） [XML]
Create a dictionary with list comprehension
...
Use a dict comprehension:
{key: value for (key, value) in iterable}
Note: this is for Python 3.x (and 2.7 upwards). Formerly in Python 2.6 and earlier, the dict built-in could receive an iterable of key/value pairs, so you can pass it a list comprehension or generator expression. For e...
How to merge remote changes at GitHub?
I'm getting following error, whn trying first Github push:
8 Answers
8
...
Cannot open backup device. Operating System error 5
Below is the query that I am using to backup (create a .bak ) my database.
21 Answers
...
Why doesn't this code simply print letters A to Z?
This snippet gives the following output (newlines are replaced by spaces):
13 Answers
...
valueOf() vs. toString() in Javascript
In Javascript every object has a valueOf() and toString() method. I would have thought that the toString() method got invoked whenever a string conversion is called for, but apparently it is trumped by valueOf().
...
What to do with commit made in a detached head
...
Create a branch where you are, then switch to master and merge it:
git branch my-temporary-work
git checkout master
git merge my-temporary-work
share
...
Which method performs better: .Any() vs .Count() > 0?
in the System.Linq namespace, we can now extend our IEnumerable's to have the Any() and Count() extension methods .
...
PHP array delete by value (not key)
...y]);
}
array_search() returns the key of the element it finds, which can be used to remove that element from the original array using unset(). It will return FALSE on failure, however it can return a false-y value on success (your key may be 0 for example), which is why the strict comparison !== o...
What does send() do in Ruby?
...
send sends a message to an object instance and its ancestors in class hierarchy until some method reacts (because its name matches the first argument).
Practically speaking, those lines are equivalent:
1.send '+', 2
1.+(2)
1 + 2
Note that send bypas...
Is there a C# type for representing an integer Range?
...
I found it best to roll my own. Some people use Tuples or Points, but in the end you want your Range to be extensive and provide some handy methods that relate to a Range. It's also best if generic (what if you need a range of Doubles, ...