大约有 31,100 项符合查询结果（耗时：0.0299秒） [XML]
Set value to NULL in MySQL
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Marc BMarc B
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How to show google.com in an iframe?
I am trying to put google.com into an iframe on my website, this works with many other websites including yahoo. But it does not work with google as it just shows a blank iframe. Why does it not render? Are there any tricks to do that?
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Face recognition Library [closed]
...f you want to understand how those algorithms work, you might want to read my Guide To Face Recognition (includes Python and GNU Octave/MATLAB examples):
http://www.bytefish.de/blog/face_recognition_with_opencv2
There's also a Python and GNU Octave/MATLAB implementation of the algorithms in my g...
Why does changing the sum order returns a different result?
...the nearest representable number. Here are two sums:
1/3 + 2/3 + 2/3 = (0.3333 + 0.6667) + 0.6667
= 1.000 + 0.6667 (no rounding needed!)
= 1.667 (where 1.6667 is rounded to 1.667)
2/3 + 2/3 + 1/3 = (0.6667 + 0.6667) + 0.3333
= 1.333 + 0.3333 (where 1...
Why implement interface explicitly?
...rong typing:
To illustrate supercat's story with an example, this would be my preferred sample code, implementing ICloneable explicitly allows Clone() to be strongly typed when you call it directly as a MyObject instance member:
public class MyObject : ICloneable
{
public MyObject Clone()
{
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How Python web frameworks, WSGI and CGI fit together
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You can run WSGI over CGI as Pep333 demonstrates as an example. However every time there is a request a new Python interpreter is started and the whole context (database connections, etc.) needs to be build which all take time.
The best if you want to run ...
How to create our own Listener interface in android?
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Create a new file:
MyListener.java:
public interface MyListener {
// you can define any parameter as per your requirement
public void callback(View view, String result);
}
In your activity, implement the interface:
MyActivity.java:
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Is there a way to iterate over a slice in reverse in Go?
...e a list in a function without duplicating it. It makes the code nicer in my sense.
package main
import (
"fmt"
)
func reverse(lst []string) chan string {
ret := make(chan string)
go func() {
for i, _ := range lst {
ret <- lst[len(lst)-1-i]
}
cl...
CommandError: You must set settings.ALLOWED_HOSTS if DEBUG is False
...and/or hostname also:
ALLOWED_HOSTS = ['localhost', '127.0.0.1', '111.222.333.444', 'mywebsite.com']
The condition to be satisfied is that the host header (or X-Forwarded-Host if USE_X_FORWARDED_HOST is enabled) should match one of the values in ALLOWED_HOSTS.
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Does a favicon have to be 32x32 or 16x16?
...you will have to add more than 10 files in the correct sizes and formats.
My friend and I have created an App just for this! you can find it in faviconit.com
We did this, so people don't have to create all these images and the correct tags by hand, create all of them used to annoy me a lot!
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