Tutorial by Examples: p

Most basic Django debugging tool is pdb, a part of Python standard library. Init view script Let's examine a simple views.py script: from django.http import HttpResponse def index(request): foo = 1 bar = 0 bug = foo/bar return HttpResponse("%d goes here." % ...

To check for location services we need real device but for testing purpose we can also use simulator and add our own location by following below steps: add new GPX file into your project. in GPX file add waypoints like <?xml version="1.0"?> <gpx version="1.1" cre...

git config --global help.autocorrect 17 This enables autocorrect in git and will forgive you for your minor mistakes (e.g. git stats instead of git status). The parameter you supply to help.autocorrect determines how long the system should wait, in tenths of a second, before automatically applyin...

private List<FooBar> _fooBars; public List<FooBar> FooBars { get { return _fooBars ?? (_fooBars = new List<FooBar>()); } } The first time the property .FooBars is accessed the _fooBars variable will evaluate as null, thus falling through to the assignment statement ass...

Noting that zip transposes a tuple of lists into a list of tuples, ghci> uncurry zip ([1,2],[3,4]) [(1,3), (2,4)] and the similarity between the types of transpose and sequenceA, -- transpose exchanges the inner list with the outer list -- +---+-->--+-+ -- | | ...

If you need to download files with git under a proxy, setting proxy server system-wide couldn't be enough. You could also try the following: git config --global http.proxy http://<proxy-server>:<port>/

Introduction Play has several plugins for different IDE-s. The eclipse plugin allows to transform a Play application into a working eclipse project with the command activator eclipse. Eclipse plugin may be set per project or globally per sbt user. It depends on team work, which approach should be u...

New build systems can be created from the menu (Tools | Build System | New Build System). { "shell_cmd": "somecommand -u \"$file\"", "result_file_regex": "^[ ]*File \"(.*?)\"", "result_line_regex": "^[ ]*File ...

Installation Creating a new project Selecting Target and minimum version for your Application

When creating the project You should check "Include Unit Tests" in the project creation dialog. After creating the project If you missed checking that item while creating your project, you could always add test files later. To do so: 1- Go to your project settings in Xcode 2- Go to ...

To stop the Handler from execution remove the callback attached to it using the runnable running inside it: Runnable my_runnable = new Runnable() { @Override public void run() { // your code here } }; public Handler handler = new Handler(); // use 'new Handler(Looper.get...

In order to call a function through a function pointer, the function pointer's type must exactly match the function's type. Otherwise, the behaviour is undefined. Example: int f(); void (*p)() = reinterpret_cast<void(*)()>(f); p(); // undefined

To build up an expression like _ => _.Field == "VALUE" at runtime. Given a predicate _ => _.Field and a string value "VALUE", create an expression that tests whether or not the predicate is true. The expression is suitable for: IQueryable<T>, IEnumerable<T>...

A spannable TextView can be used in Android to highlight a particular portion of text with a different color, style, size, and/or click event in a single TextView widget. Consider that you have defined a TextView as follows: TextView textview=findViewById(R.id.textview); Then you can apply diff...

To get the time at which your app was installed or updated, you should query Android's package manager. try { // Reference to Android's package manager PackageManager packageManager = this.getPackageManager(); // Getting package info of this application PackageInfo info = pack...

class Example def example_method :example end def subexample_method :example end def not_missed_method :example end def method_missing name return :example if name == :missing_example_method return :example if name == :missing_subexample_method ...

Ruby moves up on ancestors chain of an object. This chain can contain both modules and classes. Same rules about moving up the chain apply to modules as well. class Example end module Prepended def initialize *args return super :default if args.empty? super end end module Fi...

There are two ways to interrupt messages. Use method_missing to interrupt any non defined message. Define a method in middle of a chain to intercept the message After interrupting messages, it is possible to: Reply to them. Send them somewhere else. Modify the message or its result. ...

To String Swift let string = String(NSString(data: data, encoding: NSUTF8StringEncoding)) //assuming data is a valid NSData object Objective-C NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; //assuming data is a valid NSData object [string release]; T...

This class is called Greeter. Its responsibility is to output a greeting. It has two dependencies. It needs something that will give it the greeting to output, and then it needs a way to output that greeting. Those dependencies are both described as interfaces, IGreetingProvider and IGreetingWriter....