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What does “hashable” mean in Python?
...gt;>>
>>> hash([1, 2])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'
>>> hash({1, 2})
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'se...
Generating a UUID in Postgres for Insert statement?
...ib package, you'll get the error: ERROR: could not open extension control file "/usr/share/postgresql/9.3/extension/uuid-ossp.control": No such file or directory
– Drew Noakes
Jan 29 '14 at 16:27
...
C++及Windows异常处理(try，catch; __try,__finally, __except) - C/C++ - ...
...命周期”机制替他记住了 :O) ] 下面是一个例子：
class File_handle {
FILE* p;
public:
File_handle(const char* n, const char* a)
{ p = fopen(n,a); if (p==0) throw Open_error(errno); }
File_handle(FILE* pp)
{ p = pp; if (p==0...
What is the difference between the | and || or operators?
... = 10 (0X02) Read-Write = 11 (0X03). One useful example would be opening files. A simple example would be:
File.Open(FileAccess.Read | FileAccess.Write); //Gives read/write access to the file
|| is a logical OR. This is the way most people think of OR and compares two values based on their...
How to perform Callbacks in Objective-C
...elegates. Here's an example of a custom delegate implementation;
Header File:
@interface MyClass : NSObject {
id delegate;
}
- (void)setDelegate:(id)delegate;
- (void)doSomething;
@end
@interface NSObject(MyDelegateMethods)
- (void)myClassWillDoSomething:(MyClass *)myClass;
- (void)myClassD...
iPhone: Detecting user inactivity/idle time since last screen touch
...ve your application delegate subclass UIApplication. In the implementation file, override the sendEvent: method like so:
- (void)sendEvent:(UIEvent *)event {
[super sendEvent:event];
// Only want to reset the timer on a Began touch or an Ended touch, to reduce the number of timer resets.
...
Android app in Eclipse: Edit text not showing on Graphical layout
...9
buildToolsVersion "19.1"
4) The IDE will prompt you to sync the Gradle file with your project, click Yes.
5) Open your activity file and then change the 'Android version to use when rendering layouts in IDE' to 'API 19'. This is the green colored Android Bot towards the right on the preview win...
Should I use Vagrant or Docker for creating an isolated environment? [closed]
...Box (or others) with a huge overhead. It requires you to have a hard drive file that can be huge, it takes a lot of ram, and performance may be not very good.
Docker on the other hand uses kernel cgroup and namespacing via LXC. It means that you are using the same kernel as the host and the same fi...
Can I set a TTL for @Cacheable
... me.
Import Maven Dependencies
Add these dependencies to your maven pom file and run clean and packages. These files are the Guava dep and Spring helper methods for use in the CacheBuilder.
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>...
Capture Signature using HTML5 and iPad
...exactly is missing in your opinion in the documentation provided in README file? I'm open to suggestions how to improve it.
– szimek
Sep 4 '13 at 12:00
8
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