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How do I implement interfaces in python?
...the trick.
from abc import ABCMeta, abstractmethod
class IInterface:
__metaclass__ = ABCMeta
@classmethod
def version(self): return "1.0"
@abstractmethod
def show(self): raise NotImplementedError
class MyServer(IInterface):
def show(self):
print 'Hello, World 2!'
...
How to call a Parent Class's method from Child Class in Python?
... for calling parent method.
If Foo class inherits from Bar, then from Bar.__init__ can be invoked from Foo via super().__init__():
class Foo(Bar):
def __init__(self, *args, **kwargs):
# invoke Bar.__init__
super().__init__(*args, **kwargs)
...
Is there an online name demangler for C++? [closed]
... This one worked for me, but not the one in the more popular answer: _ZN9cdnalizer11rewriteHTMLINS_6apache8IteratorEcEET_RKSsRKNS_6ConfigES3_S3_St8functionIFS3_RKS3_SB_EES9_IFvSsEE
– matiu
Dec 28 '13 at 6:52
...
top -c command in linux to filter processes listed based on processname
... to get pid's of matching command lines:
top -c -p $(pgrep -d',' -f string_to_match_in_cmd_line)
top -p expects a comma separated list of pids so we use -d',' in pgrep. The -f flag in pgrep makes it match the command line instead of program name.
...
Correct use of Multimapping in Dapper
...ourth
------------------+-------------+-------------------+------------
col_1 col_2 col_3 | col_n col_m | col_A col_B col_C | col_9 col_8
------------------+-------------+-------------------+------------
Following is the dapper query that you will have to write.
Query<TFirst, TSecond, TThird, TF...
Bash continuation lines
...here document. (Line terminators will still remain, though.)
cat <<-____HERE
continuation
lines
____HERE
See also http://ss64.com/bash/syntax-here.html
If you need to preserve some, but not all, leading whitespace, you might use something like
sed 's/^ //' <<____HERE
Th...
What is the documents directory (NSDocumentDirectory)?
...lowing tech note: https://developer.apple.com/library/ios/technotes/tn2406/_index.html
The Apple sanctioned way (from the link above) is as follows:
// Returns the URL to the application's Documents directory.
- (NSURL *)applicationDocumentsDirectory
{
return [[[NSFileManager defaultManager] U...
Using OR in SQLAlchemy
...
From the tutorial:
from sqlalchemy import or_
filter(or_(User.name == 'ed', User.name == 'wendy'))
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图片工具箱：获取图片大小、裁剪、压缩、旋转、加水印（附 .aia 源码） · ...
...图与显示大小
global 历史 = []
when 图像选择器_相册.AfterPicking() {
历史 = [图像选择器_相册.Selection]
显示()
}
when 照相机1.AfterPicture(image) {
历史 = [image]
显示()
}
procedure 显示() {
var 图 = 历史[length(历史)]
图像_预览...
MQTT客户端内置版使用指导 · App Inventor 2 中文网
...入口。
案例一：连接并订阅
when 按钮_连接.Click() {
MqttClient1.Connect(true)
}
when MqttClient1.ConnectionStateChanged(新状态, 状态文本) {
标签1.Text = 状态文本
if MqttClient1.IsConnected {
MqttClient1.Subscribe("demo/status", 0)
}
}
...