Tutorial by Examples: en

If we just try the following: import json from datetime import datetime data = {'datetime': datetime(2016, 9, 26, 4, 44, 0)} print(json.dumps(data)) we get an error saying TypeError: datetime.datetime(2016, 9, 26, 4, 44) is not JSON serializable. To be able to serialize the datetime object p...

Considering the following document : <?xml version='1.0' encoding='UTF-8' ?> <library> <book id='1'>Effective Java</book> <book id='2'>Java Concurrency In Practice</book> </library> One can use the following code to build a DOM tree out of a St...

Considering the following document : <?xml version='1.0' encoding='UTF-8' ?> <library> <book id='1'>Effective Java</book> <book id='2'>Java Concurrency In Practice</book> <notABook id='3'>This is not a book element</notABook> </librar...

Method references make excellent self-documenting code, and using method references with Streams makes complicated processes simple to read and understand. Consider the following code: public interface Ordered { default int getOrder(){ return 0; } } public interface Valued&lt...

Gradient Boosting for classification. The Gradient Boosting Classifier is an additive ensemble of a base model whose error is corrected in successive iterations (or stages) by the addition of Regression Trees which correct the residuals (the error of the previous stage). Import: from sklearn.ensem...

Follow this steps for adding splash screen into WPF application in Visual Studio: Create or get any image and add it to your project (e.g. inside Images folder): Open properties window for this image (View → Properties Window) and change Build Action setting to SplashScreen value: R...

If your application is lightweight and simple, it will launch very fast, and with similar speed will appear and disappear splash screen. As soon as splash screen disappearing after Application.Startup method completed, you can simulate application launch delay by following this steps: Open App.x...

# This comment occupies a whole line - some item # This comment succeeds content of a line - http://example.com/#nocomment - "This # does not introduce a comment." - | This is a block scalar. A # inside it does not introduce a comment. # unless it is less indented than th...

There are a few ways to determine the current shell echo $0 ps -p $$ echo $SHELL

If we want to get the x-cordinate of origin of the view, then we need to write like: view.frame.origin.x For width, we need to write: view.frame.size.width But if we add a simple extension to an UIView, we can get all the attributes very simply, like: view.x view.y view.width view.height...

This is very useful when setting indent of your code if condition1 if condition2 # some commands here endif endif move your cursor to the 2nd line, then >>, the code will indent to right. Now you can repeat your action by continue to 3rd line, then hit . twice, the result will be if ...

vim-pathogen is a runtimepath manager created by Tim Pope to make it easy to install plugins and runtime files in their own private directories. Installing Pathogen Put pathogen in ~/.vim/bundle (here with Git, but it's not mandatory): git clone https://github.com/tpope/vim-pathogen.git ...

String and char-like variables can be concatenated using ABAP CONCATENATE command. An extra variable for storing the results is required. Example: CONCATENATE var1 var2 var3 INTO result. "result now contains the values of var1, var2 & var3 stringed together without spaces Shorthand ...

The hooks feature can be globally enabled/disabled by setting the following item in the application/config/config.php file: $config['enable_hooks'] = TRUE;

Static variables and methods are not part of an instance, There will always be a single copy of that variable no matter how many objects you create of a particular class. For example you might want to have an immutable list of constants, it would be a good idea to keep it static and initialize it j...

ALTER TABLE table_name RENAME PARTITION p3 TO p6;

ALTER TABLE table_name MOVE PARTITION partition_name TABLESPACE tablespace_name;

Using some setters, without setting all needed properties in the constructor(s) public final class Person { // example of a bad immutability private final String name; private final String surname; public Person(String name) { this.name = name; } public String ge...

JasperSoft Studio If datasource or database connection is needed to fill report, create your Data Adapter in Repository Explorer by right clicking "Data Adapters" selecting "Create Data Adapter" Enter preview mode by selecting the Preview tab (no errors in deign need t...

:s/foo/bar/c Marks the first instance of foo on the line and asks for confirmation for substitution with bar :%s/foo/bar/gc Marks consecutively every match of foo in the file and asks for confirmation for substitution with bar