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Why does ~True result in -2?
...ubclass of int (for historical reasons; booleans were only added in Python 2.3).
Since int(True) is 1, ~True is ~1 is -2.
See PEP 285 for why bool is a subclass of int.
If you wanted the boolean inverse, use not:
>>> not True
False
>>> not False
True
If you wanted to know why...
How do I automatically sort a has_many relationship in Rails?
...
If you are using Rails 2.3 and want to use the same default ordering for all collections of this object you can use default_scope to order your collection.
class Student < ActiveRecord::Base
belongs_to :class
default_scope :order => 'na...
What is the difference between an Azure Web Site and an Azure Web Role
...P-restricted Virtual Machines
ACL-restricted endpoints (added in Azure SDK 2.3, April 2014)
Support for any TCP/UDP ports (Web Sites are restricted to TCP 80/443)
Web Apps have advantages over Web Roles though:
Near-instant deployment with deployment history / rollbacks
Visual Studio Online, git...
Phonegap Cordova installation Windows
...r. Extract its contents.
Supported Android Devices
Android 2.2
Android 2.3
Android 4.x
Phonegap Cordova Installation
Set PATH environment variable for android
From desktop, right click My Computer and click Properties.
Click Advance System Settings link in the left column.
In the system prope...
How can I create directory tree in C++/Linux?
...e test code has been upgraded and reproduced the problem on a MacBook
Pro (2.3GHz Intel Core i7, running Mac OS X 10.7.4), and suggests that
the problem is fixed in the revision (but testing can only show the
presence of bugs, never their absence).
The code shown is now v1.16; there have been cosmet...
Fragment or Support Fragment?
...around the support library. Also since there are about 38% of all users on 2.3 it might make business sense to include this OS version. In such a case you can use the support library in combination with Jake Wartons ActionBarSherlock (or with googles support ActionBar Library once it is finally rele...
file_get_contents(“php://input”) or $HTTP_RAW_POST_DATA, which one is better to get the body of JSON
...pt>
function fn(){
var js_obj = {plugin: 'jquery-json', version: 2.3};
var encoded = JSON.stringify( js_obj );
var data= encoded
$.ajax({
type: "POST",
url: '1.php',
data: data,
success: function(data){
console.log(data);
}
});
}
</script>
1.php
//p...
How to obtain the start time and end time of a day?
...anges happen over midnight which might further confuse things.
Joda-Time 2.3 offers a method for this very purpose, to obtain first moment of the day: withTimeAtStartOfDay(). Similarly in java.time, LocalDate::atStartOfDay.
Search StackOverflow for "joda half-open" to see more discussion and examp...
理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...)和__exit__()方法即可。此例中，Sample()的__enter__()方法返回新创建的Sample对象，并赋值给变量sample。 When executed: 代码执行后：
bash-3.2$ ./with_example02.py
type: <type 'exceptions.ZeroDivisionError'>
value: integer division or modulo by zero
trace: <traceb...
Adding asterisk to required fields in Bootstrap 3
...
thanks! also works for bootstrap 2.3 with .control-group.required .control-label:after { content:"*"; color:red; }
– edditor
Jul 16 '14 at 14:58
...