Welcome to Python.org

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role="treeitem"><a href="/events/python-events/past/" title="">Python Events Archive</a></li> <li class="tier-2 element-4" role="treeitem"><a href="/events/python-user-group/past/" title="">User Group Events Archive</a></li> <li class="tier-2 element-5" role="treeitem"><a href="https://wiki.python.org/moin/PythonEventsCalendar#Submitting_an_Event" title="">Submit an Event</a></li> </ul> </li> </ul> </nav> <div class="header-banner ">  <div id="dive-into-python" class="flex-slideshow slideshow"> <ul class="launch-shell menu" id="launch-shell"> <li> <a class="button prompt" id="start-shell" data-shell-container="#dive-into-python" href="/shell/">>_ <span class="message">Launch Interactive Shell</span> </a> </li> </ul> <ul class="slides menu"> <li> <div class="slide-code"><pre><code><span class="comment"># Python 3: Fibonacci series up to n</span> >>> def fib(n): >>> a, b = 0, 1 >>> while a < n: >>> print(a, end=' ') >>> a, b = b, a+b >>> print() >>> fib(1000) <span class="output">0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987</span></code></pre></div> <div class="slide-copy"><h1>Functions Defined</h1> <p>The core of extensible programming is defining functions. Python allows mandatory and optional arguments, keyword arguments, and even arbitrary argument lists. <a href="//docs.python.org/3/tutorial/controlflow.html#defining-functions">More about defining functions in Python 3</a></p></div> </li> <li> <div class="slide-code"><pre><code><span class="comment"># Python 3: List comprehensions</span> >>> fruits = ['Banana', 'Apple', 'Lime'] >>> loud_fruits = [fruit.upper() for fruit in fruits] >>> print(loud_fruits) <span class="output">['BANANA', 'APPLE', 'LIME']</span> <span class="comment"># List and the enumerate function</span> >>> list(enumerate(fruits)) <span class="output">[(0, 'Banana'), (1, 'Apple'), (2, 'Lime')]</span></code></pre></div> <div class="slide-copy"><h1>Compound Data Types</h1> <p>Lists (known as arrays in other languages) are one of the compound data types that Python understands. Lists can be indexed, sliced and manipulated with other built-in functions. <a href="//docs.python.org/3/tutorial/introduction.html#lists">More about lists in Python 3</a></p></div> </li> <li> <div class="slide-code"><pre><code><span class="comment"># Python 3: Simple arithmetic</span> >>> 1 / 2 <span class="output">0.5</span> >>> 2 ** 3 <span class="output">8</span> >>> 17 / 3 <span class="comment"># classic division returns a float</span> <span class="output">5.666666666666667</span> >>> 17 // 3 <span class="comment"># floor division</span> <span class="output">5</span></code></pre></div> <div class="slide-copy"><h1>Intuitive Interpretation</h1> <p>Calculations are simple with Python, and expression syntax is straightforward: the operators <code>+</code>, <code>-</code>, <code>*</code> and <code>/</code> work as expected; parentheses <code>()</code> can be used for grouping. <a href="http://docs.python.org/3/tutorial/introduction.html#using-python-as-a-calculator">More about simple math functions in Python 3</a>.</p></div> </li> <li> <div class="slide-code"><pre><code><span class="comment"># For loop on a list</span> >>> numbers = [2, 4, 6, 8] >>> product = 1 >>> for number in numbers: ... product = product * number ... >>> print('The product is:', product) <span class="output">The product is: 384</span></code></pre></div> <div class="slide-copy"><h1>All the Flow You’d Expect</h1> <p>Python knows the usual control flow statements that other languages speak — <code>if</code>, <code>for</code>, <code>while</code> and <code>range</code> — with some of its own twists, of course. <a href="//docs.python.org/3/tutorial/controlflow.html">More control flow tools in Python 3</a></p></div> </li> <li> <div class="slide-code"><pre><code><span class="comment"># Simple output (with Unicode)</span> >>> print("Hello, I'm Python!") <span class="output">Hello, I'm Python!</span> <span class="comment"># Input, assignment</span> >>> name = input('What is your name?\n') <span class="output">What is your name? Python</span> >>> print(f'Hi, {name}.') <span class="output">Hi, Python.</span></code> </pre></div> <div class="slide-copy"><h1>Quick & Easy to Learn</h1> <p>Experienced programmers in any other language can pick up Python very quickly, and beginners find the clean syntax and indentation structure easy to learn. <a href="//docs.python.org/3/tutorial/">Whet your appetite</a> with our Python 3 overview.</p></div> </li> </ul> </div> </div> <div class="introduction"> <p>Python is a programming language that lets you work quickly <span class="breaker"></span>and integrate systems more effectively. <a class="readmore" href="/doc/">Learn More</a></p> </div> </div> </header> <div id="content" class="content-wrapper">  <div class="container"> <section class="main-content " role="main"> <div class="row"> <div class="small-widget get-started-widget"> <h2 class="widget-title"><span aria-hidden="true" class="icon-get-started"></span>Get Started</h2> <p>Whether you're new to programming or an experienced developer, it's easy to learn and use Python.</p> <p><a href="/about/gettingstarted/">Start with our Beginner’s Guide</a></p> </div> <div class="small-widget download-widget"> <h2 class="widget-title"><span aria-hidden="true" class="icon-download"></span>Download</h2> <p>Python source code and installers are available for download for all versions!</p> <p>Latest: <a href="/downloads/release/python-3132/">Python 3.13.2</a></p> </div> <div class="small-widget documentation-widget"> <h2 class="widget-title"><span aria-hidden="true" class="icon-documentation"></span>Docs</h2> <p>Documentation for Python's standard library, along with tutorials and guides, are available online.</p> <p><a href="https://docs.python.org">docs.python.org</a></p> </div> <div class="small-widget jobs-widget last"> <h2 class="widget-title"><span aria-hidden="true" class="icon-jobs"></span>Jobs</h2> <p>Looking for work or have a Python related position that you're trying to hire for? 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