大约有 42,000 项符合查询结果（耗时：0.0593秒） [XML]
How to measure elapsed time in Python?
...
If you just want to measure the elapsed wall-clock time between two points, you could use time.time():
import time
start = time.time()
print("hello")
end = time.time()
print(end - start)
This gives the execution time in seconds.
Another option since 3.3 might ...
What is the difference D3 datum vs. data?
...iled answer to this question here, but the post below pretty much captures all the key points regarding the two methods and how they differ from each other.
When supplying data as an input argument
selection.data(data) will attempt to perform a data-join between the elements of the data array wit...
z-index not working with fixed positioning
...
This question can be solved in a number of ways, but really, knowing the stacking rules allows you to find the best answer that works for you.
Solutions
The <html> element is your only stacking context, so just follow the stacking rules inside a stacking context and you w...
Python Regex instantly replace groups
Is there any way to directly replace all groups using regex syntax?
2 Answers
2
...
How do I get LaTeX to hyphenate a word that contains a dash?
...mmand a command that expands to multi-discipli\-nary (use Search + Replace All to replace existing words).
share
|
improve this answer
|
follow
|
...
How do you create a transparent demo screen for an Android app?
...a semi-transparent demo screen that is launched only when a user first installs my application. Here's an example from the Pulse News app:
...
How to determine if a decimal/double is an integer?
...
For floating point numbers, n % 1 == 0 is typically the way to check if there is anything past the decimal point.
public static void Main (string[] args)
{
decimal d = 3.1M;
Console.WriteLine((d % 1) == 0);
d = 3.0M;
Console.WriteLine((d % 1) == 0);
}
...
How to update Ruby to 1.9.x on Mac?
...ve) RVM (Ruby Version Manager) is the Standard for upgrading your Ruby installation on OSX: https://rvm.io
To get started, open a Terminal Window and issue the following command:
\curl -L https://get.rvm.io | bash -s stable --ruby
( you will need to trust the RVM Dev Team that the command is no...
AngularJS access parent scope from child controller
...rty}}
</div>
See jsFiddle: http://jsfiddle.net/2r728/
Update
Actually since you defined cities in the parent controller your child controller will inherit all scope variables. So theoritically you don't have to call $parent. The above example can also be written as follows:
function Paren...
Generic method multiple (OR) type constraint
Reading this , I learned it was possible to allow a method to accept parameters of multiple types by making it a generic method. In the example, the following code is used with a type constraint to ensure "U" is an IEnumerable<T> .
...