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Skip to content ▼ Close Python PSF Docs PyPI Jobs Community ▲ The Python Network Donate ≡ Menu Search This Site GO A A Smaller Larger Reset Socialize Facebook Twitter Chat on IRC About Applications Quotes Getting Started Help Python Brochure Downloads All releases Source code Windows Mac OS X Other Platforms License Alternative Implementations Documentation Docs Audio/Visual Talks Beginner's Guide Developer's Guide FAQ Non-English Docs PEP Index Python Books Python Essays Community Community Survey Diversity Mailing Lists IRC Forums PSF Annual Impact Report Python Conferences Special Interest Groups Python Logo Python Wiki Merchandise Community Awards Code of Conduct Success Stories Arts Business Education Engineering Government Scientific Software Development News Python News PSF Newsletter Community News PSF News PyCon News Events Python Events User Group Events Python Events Archive User Group Events Archive Submit an Event >_ Launch Interactive Shell # Python 3: Fibonacci series up to n >>> def fib(n): >>> a, b = 0, 1 >>> while a < n: >>> print(a, end=' ') >>> a, b = b, a+b >>> print() >>> fib(1000) 0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 Functions Defined The core of extensible programming is defining functions. Python allows mandatory and optional arguments, keyword arguments, and even arbitrary argument lists. More about defining functions in Python 3 # Python 3: List comprehensions >>> fruits = ['Banana', 'Apple', 'Lime'] >>> loud_fruits = [fruit.upper() for fruit in fruits] >>> print(loud_fruits) ['BANANA', 'APPLE', 'LIME'] # List and the enumerate function >>> list(enumerate(fruits)) [(0, 'Banana'), (1, 'Apple'), (2, 'Lime')] Compound Data Types 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. More about lists in Python 3 # Python 3: Simple arithmetic >>> 1 / 2 0.5 >>> 2 ** 3 8 >>> 17 / 3 # classic division returns a float 5.666666666666667 >>> 17 // 3 # floor division 5 Intuitive Interpretation Calculations are simple with Python, and expression syntax is straightforward: the operators + , - , * and / work as expected; parentheses () can be used for grouping. More about simple math functions in Python 3 . # Python 3: Simple output (with Unicode) >>> print("Hello, I'm Python!") Hello, I'm Python! # Input, assignment >>> name = input('What is your name?\n') >>> print('Hi, %s.' % name) What is your name? Python Hi, Python. Quick & Easy to Learn Experienced programmers in any other language can pick up Python very quickly, and beginners find the clean syntax and indentation structure easy to learn. Whet your appetite with our Python 3 overview. # For loop on a list >>> numbers = [2, 4, 6, 8] >>> product = 1 >>> for number in numbers: ... product = product * number ... >>> print('The product is:', product) The product is: 384 All the Flow You’d Expect Python knows the usual control flow statements that other languages speak — if , for , while and range — with some of its own twists, of course. More control flow tools in Python 3 Python is a programming language that lets you work quickly and integrate systems more effectively. Learn More Get Started Whether you're new to programming or an experienced developer, it's easy to learn and use Python. Start with our Beginner’s Guide Download Python source code and installers are available for download for all versions! Latest: Python 3.8.1 Docs Documentation for Python's standard library, along with tutorials and guides, are available online. docs.python.org Jobs Looking for work or have a Python related position that you're trying to hire for? Our relaunched community-run job board is the place to go. jobs.python.org Latest News More 2020- 01-25 Python 3.9.0a3 now available for testing 2020- 01-17 Start using 2FA and API tokens on PyPI 2020- 01-17 Python Software Foundation - Q4 2019 Newsletter 2020- 01-07 Python Software Foundation Fellow Members for Q4 2019 2019- 12-20 Python 2 series to be retired by April 2020 Upcoming Events More 2020- 02-04 PyRana General Body Meeting - February 2020 2020- 02-08 PyCascades 2020 2020- 02-18 PyCon Namibia 2020 2020- 02-21 PyCon Belarus 2020 2020- 02-25 Visual Diagnostics for Machine Learning with Python Success Stories More When an Open Data standard is created and promoted, it’s important to think why - what change is this trying to drive? What will people do with this data that they couldn’t do before? Saving the world with Open Data and Python by James Baster Use Python for… More Web Development : Django , Pyramid , Bottle , Tornado , Flask , web2py GUI Development : tkInter , PyGObject , PyQt , PySide , Kivy , wxPython Scientific and Numeric : SciPy , Pandas , IPython Software Development : Buildbot , Trac , Roundup System Administration : Ansible , Salt , OpenStack >>> Python Enhancement Proposals (PEPs) : The future of Python is discussed here. RSS >>> Python Software Foundation The mission of the Python Software Foundation is to promote, protect, and advance the Python programming language, and to support and facilitate the growth of a diverse and international community of Python programmers. 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