Welcome to Python.org
Notice: While JavaScript is not essential for this website, your interaction with the content will be limited. Please turn JavaScript on for the full experience.
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
macOS
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
Diversity
Mailing Lists
IRC
Forums
PSF Annual Impact Report
Python Conferences
Special Interest Groups
Python Logo
Python Wiki
Code of Conduct
Community Awards
Get Involved
Shared Stories
Success Stories
Arts
Business
Education
Engineering
Government
Scientific
Software Development
News
Python News
PSF Newsletter
PSF News
PyCon US News
News from the Community
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
>>> 17 / 3 # classic division returns a float
5.666666666666667
>>> 17 // 3 # floor division
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.
# 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
# Simple output (with Unicode)
>>> print(\"Hello, I'm Python!\")
Hello, I'm Python!
# Input, assignment
>>> name = input('What is your name?\\n')
What is your name?
Python
>>> print(f'Hi, {name}.')
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.
Python is a programming language that lets you work quickly and integrate systems more effectively. Learn More
Support Python in 2022! End of year fundraiser and membership drive are live now! GIVE NOW
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 3.11.1
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
2022-12-22
More Python Everywhere, All at Once: Looking Forward to 2023
2022-12-22
Python Software Foundation - December 2022 Newsletter
2022-12-08
Introducing a New Sliding Scale Membership
2022-12-06
Python 3.11.1, 3.10.9, 3.9.16, 3.8.16, 3.7.16, and 3.12.0 alpha 3 are now available
2022-11-23
Where is the PSF?
Upcoming Events
More
2022-12-27
XtremePython 2022
2023-01-18
Python Meeting D眉sseldorf
2023-02-16
PyConFr 2023
2023-02-21
PyCon Namibia 2023
2023-02-25
PyCon PH 2023
Success Stories
More
"Some of the things [SonarCloud] spots are impressive (probably driven by some introspection and/or type inference), not just the simple pattern matching that I am used to in most of the flake8 ecosystem."
- Peter J. A. Cock - maintainer of BioPython
Deliver Clean and Safe Code for Your Python Applications by Kirti Joshi, Nicolas Bontoux
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, xonsh
>>> 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. Learn more
Become a Member
Donate to the PSF
▲ Back to Top
About
Applications
Quotes
Getting Started
Help
Python Brochure
Downloads
All releases
Source code
Windows
macOS
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
Diversity
Mailing Lists
IRC
Forums
PSF Annual Impact Report
Python Conferences
Special Interest Groups
Python Logo
Python Wiki
Code of Conduct
Community Awards
Get Involved
Shared Stories
Success Stories
Arts
Business
Education
Engineering
Government
Scientific
Software Development
News
Python News
PSF Newsletter
PSF News
PyCon US News
News from the Community
Events
Python Events
User Group Events
Python Events Archive
User Group Events Archive
Submit an Event
Contributing
Developer's Guide
Issue Tracker
python-dev list
Core Mentorship
Report a Security Issue
▲ Back to Top
Help & General Contact
Diversity Initiatives
Submit Website Bug
Status
Copyright 2001-2022.
Python Software Foundation
Legal Statements
Privacy Policy
Powered by Heroku