web development standards

 

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Python (programming language)

Python
Official Python Logo
Paradigmmulti-paradigm: object-oriented, imperative, functional
Appeared in1991
Designed byGuido van Rossum
DeveloperPython Software Foundation
Latest release3.0.1/2009-2-13; 23 days ago
2.6.1/2008-12-4; 94 days ago
Typing disciplineduck, dynamic, strong
Major implementationsCPython, Jython, IronPython, PyPy, Python for S60
DialectsStackless Python, RPython
Influenced byABC, ALGOL 68,[1] C, Haskell, Icon, Lisp, Modula-3, Perl, Java
InfluencedBoo, Groovy, Ruby, Cobra, D
OSCross-platform
LicensePython Software Foundation License
Websitehttp://www.python.org/

Python is a general-purpose high-level programming language.[2] Its design philosophy emphasizes code readability.[3] Python's core syntax and semantics are minimalistic, while the standard library is large and comprehensive. Its use of whitespace as block delimiters is unusual among popular programming languages.

Python supports multiple programming paradigms (primarily object oriented, imperative, and functional) and features a fully dynamic type system and automatic memory management, similar to Perl, Ruby, Scheme, and Tcl. Like other dynamic languages, Python is often used as a scripting language.

The language has an open, community-based development model managed by the non-profit Python Software Foundation, which maintains the de facto standard definition of the language in CPython, the reference implementation.

 

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How to Meet the WCAG 2.0 Accessibility Standards on a Website ...


Instructions

Difficulty: Moderate Step1
Provide text alternatives for any non-text content, so that it can be changed into other forms users may need, such as large print, braille, speech, symbols or simpler language. This will include sign language video for audio-only files.
Step2
All non-text content that is presented to the user has a text alternative that serves the equivalent purpose. There are certain exceptions to this, including form input controls, alternatives for CAPTCHA and making purely decorative images invisible to assistive technology. This recommendation is complex and there are a number of techniques suggested that may or may not be helpful in meeting it, for example, using label elements to associate text labels with form controls and using the title attribute to identify form controls when the label element cannot be used.
Step3
Provide alternatives for time-based media. This involves audio or video synchronized with another format for presenting information and/or with time-based interactive components. For example, an audio instruction to "click now" might need to be augmented with synchronized captions.
Step4
Create content that can be presented in different ways (e.g. more simple layout ) without losing information or structure. This includes the way the parts of a Web page are organized in relation to each other, and the way a collection of Web pages is organized. It also means that rendering the content in a form that can be perceived by all users is possible.
Step5
Make it easier for users to see and hear content including separating foreground from background. This includes the choice of fonts, color, highlighting, audio controls and contrast.
Step6
Except for captions and images of text, text can be resized without assistive technology up to 200 percent without loss of content or functionality. This includes using relative measures (such as ems) for both text size and container size.
Step7
Make all functionality available from a keyboard. This doesn't exclude the use of a mouse; it just means functionality must be available without a mouse.
Step8
Provide users enough time to read and use content. There must be a way to turn things off or adjust the timing.
Step9
Do not design content in a way that is known to cause seizures. There are techniques explaining what is called the "three flashes or below threshold" for flashing content.
Step10
Provide ways to help users navigate, find content and determine where they are. This includes ways to bypass blocks of content with skip links and/or heading elements, page titles, visible focus and clear textual cues to link purpose. Step11 Make text content readable and understandable. This involves language choices, abbreviations, reading level and pronunciation. Step12 Make Web pages appear and operate in predictable ways. Things must also operate in expected ways. Be consistent; for example, the use identification of elements with symbols such as arrows must be consistent and clear. Step13 Help users avoid and correct mistakes. Errors must be described and explained and instructions and help must be provided when needed. Step14 Maximize compatibility with current and future user agents, including assistive technologies. That means use valid markup and follow the standards.

 

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