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Cool Apps

 

[] #Python Underscores Explained Inbox

 Single and double underscores have a meaning in Python’s variable and method names.

In this article, we’ll discuss the five underscore patterns and how they affect the behavior of Python programs. Understanding these concepts will help a lot, especially when writing advanced code.

• Single leading underscore: _var
• Single trailing underscore: var_
• Double leading underscore: __var
• Double leading and trailing underscore: __var__
• Single underscore: _

---

Single Leading Underscore: _var

The underscore prefix before the variable/method name indicates to a programmer that it is for internal use only. Here, the name prefixed by an underscore is treated as non-public.

Python does not have a strong note between private and public variables/function like Java. It’s as if a programmer put up an underscore warning sign that verbalizes: “Hey, this isn’t meant to be a part of the public interface of this class. Best to leave it alone.”

Let’s look at the below example:

class Person:
    def __init__(self):
        self.name = 'Prashant'
        self._age = 26

Let’s try to access the name and _age:

>>> p = Person()
>>> p.name
'Prashant'
>>> p._age
26

So, a single underscore prefix in Python does not impose any restrictions on accessing a variable.

---

Single Trailing Underscore: var_

Python has some default keywords that we cannot use as the variable name. To avoid such conflict with Python keywords or built-ins, we use underscore after the name.

Let’s look at the below example:

def method(name, class='Classname'):
                     ^
SyntaxError: invalid syntax

SyntaxError because class is a keyword in Python. So, here, we can put _ after the class:

def method(name, class_='Classname'):
    pass

The single trailing underscore allows us to use something that would otherwise be a Python keyword. Such as:

As_
With_
For_
In_

---

Double Leading Underscore (Name Mangling): __var

A double leading underscore causes the Python interpreter to rewrite the attribute name to avoid conflicts of attribute names between classes.

The interpreter replaces the double prefix underscore name with _Employee__id (as per the below example) as a way to ensure that the name will not overlap with a similar name in subclasses.

For a better understanding, look at the below example:

class Employee:
    def __init__(self):
        self.name = 'Prashant'
        self._age = 26
        self.__id = 11

Let’s try to access the name, _age, and __id:

Why did we get that AttributeError here when accessing __id? Because name mangling turns out the __id object. Let’s get the attributes list using the built-in dir().

>>> dir(p)
['_Employee__id', '__class__', ..........., '_age', 'name']>>> p._Employee__id
11

As you can see, __id is mangled to _Employee__id. This is the name mangling that has been applied by the Python interpreter. It avoids the variable from getting overridden in subclasses.

Now, let’s define a subclass and define the same variable name as we used in Employee.

class Employer(Employee):
    def __init__(self):
        Employee.__init__(self)        
        self.__id = 25

Here, we created a subclass (Employer) of Employee.

>>> emp = Employer()
>>> dir(emp)
['_Employee__id', '_Employer__id', '__class__',.........,'_age', 'name']

We can’t easily override Employee’s __id variable.

Its actual meaning is to name mangle to prevent accidental access.

---

Double Leading and Trailing Underscore: __var__

Names surrounded by a double underscore prefix and postfix are called magic methods or dunder ("Double UNDERscore").

Such as the __init__ method for object constructors, or the __call__ method to make an object callable.

Built-in classes in Python define many magic methods. You can use the dir() function to see the number of magic methods inherited by a class.

For example, the following list contains all the attributes and methods defined in the int class.

dir(int)
['__abs__', '__add__', '__and__', '__bool__', '__ceil__', '__class__', '__delattr__', '__dir__', '__divmod__', '__doc__', '__eq__', '__float__', '__floor__', '__floordiv__', '__format__', '__ge__', '__getattribute__', '__getnewargs__', '__gt__', '__hash__', '__index__', '__init__', '__init_subclass__', '__int__', '__invert__', '__le__', '__lshift__', '__lt__', '__mod__', '__mul__', '__ne__', '__neg__', '__new__', '__or__', '__pos__', '__pow__', '__radd__', '__rand__', '__rdivmod__', '__reduce__', '__reduce_ex__', '__repr__', '__rfloordiv__', '__rlshift__', '__rmod__', '__rmul__', '__ror__', '__round__', '__rpow__', '__rrshift__', '__rshift__', '__rsub__', '__rtruediv__', '__rxor__', '__setattr__', '__sizeof__', '__str__', '__sub__', '__subclasshook__', '__truediv__', '__trunc__', '__xor__', 'bit_length', 'conjugate', 'denominator', 'from_bytes', 'imag', 'numerator', 'real', 'to_bytes']

As you can see above, the int class includes various magic methods. Let’s take an example:

>>> num=10
>>> num+5
15
>>> num.__add__(5)
15

---

Single Underscore: _

Per convention, a single, standalone underscore is sometimes used as a name to indicate that a variable is temporary or insignificant.

For example, in the following loop, we don’t need access to the running index and we can use _ to indicate that it is just a temporary value:

for _ in range(2):
    print('Hey there...')Hey there...
Hey there...

Again, this meaning is per convention only and there’s no special behavior triggered in the Python interpreter.

Apart from use as a temporary variable, the underscore returns the last value that was evaluated by the interpreter. This means that you can access some computation after the execution and later store it in a variable and use it for something else:

>>> 10+20
30
>>> _
30
>>> _+10
40

I hope that you now understand how and where to use which pattern of underscore in your naming convention.

If you have any suggestions on your mind, please let me know in the comments.

https://groups.io/g/laptrinhvien/message/32

App Development : Ipad advanced development methods

 

Good apple iphone training can be hard to find, also it appears like you can easily find 100s available on market. Regrettably most of the local classes are just trained through the book so there’s no advanced instruction.

Here is what’s promising for individuals searching for some professional, advanced instruction : .A totally free advanced apple iphone development course continues to be launched on iTunes featuring Dr. Kaira Larson of Sunset Lake Software, creator from the popular free apple iphone application Molecules.

This course features 14 periods and comes with notes.Subjects covered include iPad specific programming, threads, Core Animation, Quarta movement 2d and OpenGL ES.apple iphone/iPad Application Development

As more customers embrace mobile phone technologies the interest in mobile phones is anticipated to soar. Therefore, it is no real surprise that increasingly more cell phone suppliers are on the point of contend with feature-wealthy mobile phones to capture a share of the lucrative market. The soaring interest in mobile phones is resulting in an explosive requirement for cell phone programs to grow the fundamental functionality of those products which, when they’re downloaded and installed, also produces an enormous inventory of potential cell phone coverage that may be making money by marketers through mobile ad systems.

Apple iphone/iPad Database Integration Services

To assist companies and organizations develop and leverage mobile business programs, mobile entertainment, social games and cease the revenue and brand visibility possibilities the mobile smartphone platforms can offer, Advanced Media Productions offers mobile and web-based database integration services for that Apple iOS platform. Our strong abilities and extensive experience of interaction design, Web usability, C and C++ native-code languages, XHTML, CSS, JavaScript, DHTML, Ajax and also the native Apple SDK, positions us like a unique partner for development and delivery of scalable and powerful programs for that iOS platform.
We are able to provide clients with an array of services to add mass to native apple iphone/iPad programs, varying from the couple of times of upfront talking to to strategy development, functional needs gathering, specs writing and development, to final testing and deployment. Our expert development teams help clients take full advantage of cell phone software around the iOS platform.

 

Mobile Development Strategy

Because of the quickly altering mobile smartphone technology making the best platform and implementation choices can be tough. Which platform is most effective for that customers’ application and technical needs? How you can design the screen layout and navigation to guarantee the greatest usability? Will we implement the applying like a native application or web application? Do you know the tradeoffs between cost, functionality and awesome features?

Our database integration process starts with gathering the customers’ goals and business objectives and strategy development to guarantee the long term success from the application from concept evaluation to development and maintenance. Our team of developers has got the experiencence to recognize and exploit the possibilities that increase the value of the mobile application and also the business.

 

Apple iphone Database Integration Process
Advanced Media Productions supplies a complete and integrated process to add mass to apple iphone, ipod device Touch and iPad native programs while using apple iphone SDK. Our development way of the apple iphone/iPad covers the whole process from design and development towards the information architecture and deployment from the application within the Apple AppStore.
Development begins with writing or examining the running needs, determining the screen layout, interface design and creating the look comps from the end product. This gives us the building blocks for more growth and development of an apple iphone/iPad application that actually works and it is simple to maintain and promote. All mobile database integration projects is going to be developed based on the Apple iOS development recommendations and therefore are performed to some precise schedule of key events and deliverables.
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apple iphone

 

Development Platform
The Apple apple iphone, ipod device Touch and iPad are mobile smartphone device produced by Apple Computer running with an Apple proprietary operating-system known as iOS. Mobile programs for that apple iphone, ipod device Touch and iPad are developed using Apple’s SDK.
Once developed, an apple iphone/iPad application is used through Apple Computer, which handles all apple iphone/iPad programs through its Application Store situated within Apple’s iTunes platform. Before a credit card applicatoin is positioned around the Application Store, Apple must review and approve the applying.
Our iPhone/iPad application development services range from the following.

 

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Source  http://www.coolappsnow.com/ipad-advanced-development-methods/#JRIz5RqDLUo4B3Y2.99

predicted G Pro Lite Dual

 

A Russian site says the upcoming LG handset will launch Dual G Pro Lite, a stripped down version of G Pro in terms of configuration and is cheaper, about $ 400.

 

This is a dual SIM machine and still have big screens 5.5 “like a G Pro, however, the resolution is reduced to 960 x 540.

Machine with 1GHz dual-core chip, 1GB of RAM, 8MP camera and battery capacity up to 3140 mAh, the same brother G Pro. prediction machine will be introduced in Russia in mid-October of this.

Additionally, a special Dual Lite version is more machine pen touch G Pro which did not previously exist. now we can see the current trend of the company is manufacturing more phones tablet with acceptable price

Below is the configuration of the predicted G Pro Lite Dual.

Supports dual SIM Android 4.1.2 CPU: dual-core 1GHz

Display: IPS 5.5 ” resolution of 960 x 540 RAM: 1GB

Camera follows: 8MP Internal Memory: 8GB

Memory Card: microSD Battery: 3.140mAh

Dimensions: 76.9 x 150.2 x 9.48 mm

 

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