Tutorial by Examples: ce

Python 2.x2.7 In Python 2 filter, map and zip built-in functions return a sequence. map and zip always return a list while with filter the return type depends on the type of given parameter: >>> s = filter(lambda x: x.isalpha(), 'a1b2c3') >>> s 'abc' >>> s = map(lambd...

In Python 3.x, the reduce function already explained here has been removed from the built-ins and must now be imported from functools. from functools import reduce def factorial(n): return reduce(lambda a, b: (a*b), range(1, n+1))

public class Foo { private const int TASK_ITERATION_DELAY_MS = 1000; private CancellationTokenSource _cts; public Foo() { this._cts = new CancellationTokenSource(); } public void StartExecution() { Task.Factory.StartNew(this.OwnCodeCancelable...

public class Foo { private CancellationTokenSource _cts; public Foo() { this._cts = new CancellationTokenSource(); } public void StartExecution() { Task.Factory.StartNew(this.OwnCodeCancelableTask, this._cts.Token); } public void Cance...

Unlike durations, periods can be used to accurately model clock times without knowing when events such as leap seconds, leap days, and DST changes occur. start_2012 <- ymd_hms("2012-01-01 12:00:00") ## [1] "2012-01-01 12:00:00 UTC" # period() considers leap year calculati...

GROUP BY is used in combination with aggregation functions. Consider the following table: orderIduserIdstoreNameorderValueorderDate143Store A2520-03-2016257Store B5022-03-2016343Store A3025-03-2016482Store C1026-03-2016521Store A4529-03-2016 The query below uses GROUP BY to perform aggregated calc...

#include <stdio.h> void print_all(FILE *stream) { int c; while ((c = getc(stream)) != EOF) putchar(c); } int main(void) { FILE *stream; /* call netstat command. netstat is available for Windows and Linux */ if ((stream = popen("netstat", &qu...

The interface defines the behaviour that you want to expose through the DependencyService. One example usage of a DependencyService is a Text-To-Speech service. There is currently no abstraction for this feature in Xamarin.Forms, so you need to create your own. Start off by defining an interface for...

Given this data User_IDCompletion_Date12016-07-2012016-07-2122016-07-2022016-07-2122016-07-22 ;with CTE as (SELECT *, ROW_NUMBER() OVER (PARTITION BY User_ID ORDER BY Completion_Date DESC) Row_Num FROM Data) SELECT * FORM CTE WHERE Row_Num <= n Us...

Refer to the tf.slice(input, begin, size) documentation for detailed information. Arguments: input: Tensor begin: starting location for each dimension of input size: number of elements for each dimension of input, using -1 includes all remaining elements Numpy-like slicing: # x has shape...

Flash dispatches Events for most of its objects. One of the most basic event is ENTER_FRAME, which is dispatched (at the framerate of the SWF) on every display list object. import flash.display.Sprite; import flash.events.Event; var s:Sprite = new Sprite(); s.addEventListener(Event.ENTER_FRAME...

It's fairly common that you may create a class that implements IDisposable, and then derive classes that also contain managed resources. It is recommendeded to mark the Dispose method with the virtual keyword so that clients have the ability to cleanup any resources they may own. public class Paren...

When you bind a service to your application credentials become available through the VCAP_SERVICES environment variable. This environment variable contains JSON containing the credentials for all bound services. Example VCAP_SERVICES environment variable { "push-reappt": [ { ...

app.js angular.module('myApp', ['ui.router']) .controller('controllerOne', function() { this.message = 'Hello world from Controller One!'; }) .controller('controllerTwo', function() { this.message = 'Hello world from Controller Two!'; }) .controller('controllerThree', funct...

Syntax Syntax: log_format name string ...; Syntax: access_log path [format [buffer=size] [gzip[=level]] [flush=time] [if=condition]]; access_log off; Using them together log_format compression '$remote_addr - $remote_user [$time_local] ' '"$request" $status...

Consider entities Customer, Purchase and PurchaseItem as follows: public class Customer { public string Id { get; set } // A unique Id that identifies customer public string Name {get; set; } } public class Purchase { public string Id { get; set } public string CustomerId...

Let's say you have a service the same as the one defined in the "First service and host" example. To create a client, define the client configuration section in the system.serviceModel section of your client configuration file. <system.serviceModel> <services> <cli...

You can inject any type of resource, Strings, Animations, Drawables, etc. To inject your first resource into an activity, you'll need to: Inherit from RoboActivity Annotate your resources with @InjectResource Example @InjectResource(R.string.app_name) String name; @InjectResource(R.drawa...

User input Imagine you want a user to enter a number via input. You want to ensure that the input is a number. You can use try/except for this: Python 3.x3.0 while True: try: nb = int(input('Enter a number: ')) break except ValueError: print('This is not a num...

DECLARE @Var1 INT = 5, @Var2 NVARCHAR(50) = N'Hello World', @Var3 DATETIME = GETDATE()