Tutorial by Examples: int

Plenty has been written about Python's GIL. It can sometimes cause confusion when dealing with multi-threaded (not to be confused with multiprocess) applications. Here's an example: import math from threading import Thread def calc_fact(num): math.factorial(num) num = 600000 t = Threa...

Excel formulas are used to process simple or complex equations and output the result to a specific cell within a worksheet. (There is an exception to this where the WorksheetFunction class is used in VBA programming, however VBA is out of scope for this tag - please refer to the excel-vba or vba ...

Html5 Canvas gives you the ability to fetch and change the color of any pixel on the canvas. You can use Canvas's pixel manipulation to: Create a color-picker for an image or select a color on a color-wheel. Create complex image filters like blurring and edge detection. Recolor any part of an ...

Unwind Segues Unwind Segues give you a way to “unwind” the navigation stack and specify a destination to go back to. The signature of this function is key to Interface Builder recognizing it. It must have a return value of IBAction and take one parameter of UIStoryboardSegue. The name of the ...

Error messages are generally included in a script for debugging purposes or for providing rich user experience. Simply writing error message like this: cmd || echo 'cmd failed' may work for simple cases but it's not the usual way. In this example, the error message will pollute the actual output...

#include <string.h> #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <unistd.h> #include <dirent.h> #include <ctype.h> int main(int argc, char **argv) { const char *dname = (argc > 1 ? argv[1] : "."); DI...

Open Android Studio Open Your Project Click on Gradle (From Right Side Panel, you will see Gradle Bar) Click on Refresh (Click on Refresh from Gradle Bar, you will see List Gradle scripts of your Project) Click on Your Project (Your Project Name form List (root)) Click on Tasks Click on andr...

menu.xml - (res -> menu) <menu xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" tools:context=".HomeActivity"> <item...

The trick is to use a look-behind with the regex \G, which means "end of previous match": String[] parts = str.split("(?<=\\G.{8})"); The regex matches 8 characters after the end of the last match. Since in this case the match is zero-width, we could more simply say "...

Same as the known length example, but insert the length into regex: int length = 5; String[] parts = str.split("(?<=\\G.{" + length + "})");

def hello_world(greeting: str = 'Hello'): print(greeting + ' world!') Note the spaces around the equal sign as opposed to how keyword arguments are usually styled.

Create example table Employee: CREATE TABLE Employee ( Id INT, EmpName VARCHAR(25), EmpGender VARCHAR(6), EmpDeptId INT ) Creates stored procedure that checks whether the values passed in stored procedure are not null or non empty and perform insert operation in Employee ta...

Uname is the short name for unix name. Just type uname in console to get information about your operating system. uname [OPTION] If no OPTION is specified, uname assumes the -s option. -a or --all - Prints all information, omitting -p and -i if the information is unknown. Example: > unam...

What's the deal with the following? julia> @test 0.1 + 0.2 == 0.3 Test Failed Expression: 0.1 + 0.2 == 0.3 Evaluated: 0.30000000000000004 == 0.3 ERROR: There was an error during testing in record(::Base.Test.FallbackTestSet, ::Base.Test.Fail) at ./test.jl:397 in do_test(::Base.Test....

You can change property minuteInterval to set the interval displayed by the minutes wheel. The default value is 1, the maximum value is 30. let datePicker = UIDatePicker(frame: CGRect(x: 0, y: 0, width: 320, height: 200) datePicker.minuteInterval = 15

Cassandra will not require users to login using the default configuration. Instead password-less, anonymous logins are permitted for anyone able to connect to the native_transport_port. This behaviour can be changed by editing the cassandra.yaml config to use a different authenticator: # Allow anon...

By default each user will be able to access all data in Cassandra. You'll have to configuring a different authorizer in your cassandra.yaml to grant individual object permissions to your users. # Grant all permissions to all users # authorizer: AllowAllAuthorizer # Use object permissions manage...

RAISERROR function will generate error in the TRY CATCH block: DECLARE @msg nvarchar(50) = 'Here is a problem!' BEGIN TRY print 'First statement'; RAISERROR(@msg, 11, 1); print 'Second statement'; END TRY BEGIN CATCH print 'Error: ' + ERROR_MESSAGE(); END CATCH RAISERROR ...

RAISERROR with severity (second parameter) less or equal to 10 will not throw exception. BEGIN TRY print 'First statement'; RAISERROR( 'Here is a problem!', 10, 15); print 'Second statement'; END TRY BEGIN CATCH print 'Error: ' + ERROR_MESSAGE(); END CATCH After RAISER...

You can throw exception in try catch block: DECLARE @msg nvarchar(50) = 'Here is a problem!' BEGIN TRY print 'First statement'; THROW 51000, @msg, 15; print 'Second statement'; END TRY BEGIN CATCH print 'Error: ' + ERROR_MESSAGE(); THROW; END CATCH Exception with be ...