![Python & PSF
• “hobby” programming
project
• Interpreter for a
scripting language
Dec 1989
• Python 2.0 – 16th Oct
• Unicode Support, cycle-
detecting GC
Oct 2000 • Python 3.0
• Backward-Incompatible
• Features backported to
backward compatible
2.7.x, 2.6.x
Dec 2008
Guido van Rossum – creator of Python
– benevolent dictator for life (BDFL)
Python Software Foundation(PSF) - manages the open-source licensing for Python 2.1 and later
- mission is to promote, protect and advance Python; support
and facilitate growth of international & diverse community of Python programmers. [2001]](https://image.slidesharecdn.com/helloworldwithpython-170306131841/85/Hello-World-with-Python-5-320.jpg)
![Python: Features
7
Features
Dynamic
typing
Late
binding
ExtensibleWhite
Spaces
Automatic
Memory
Management
The name Python was inspired from the series Monty Python’s Flying Circus
a = 3
a = “a string”
a = [‘a’, ‘list’]
len(a)](https://image.slidesharecdn.com/helloworldwithpython-170306131841/85/Hello-World-with-Python-7-320.jpg)
![Success Stories using Python
8
Web &
Analysis
• Mozilla
• Google
• Youtube
• Bitly
• ForecastWatch
.com etc
Science,
Energy
•ExpEYES [portable
scientific laboratory]
•VAMPZero [aircraft
conceptual design]
• Eco Mode @ SMS
Siemag AG
• Large Hadron
Collider (CERN)
•EPRI (Life on Mars -
ESA) [Python
powered clusters
and graphics
processing]
Animation &
Graphics
• Blender
• Houdini
Systems
Cloud, Data
Centers etc.
• Open Stack
• Google App
Engine
• Flying Circus
• rackspace
Others
• Scientific &
Numeric
Processing –
SciPy, NumPy
• Machine
Learning &
Analytics –
SocialCorps,
Innoplexus,
Fractal Analysis
• Automation of
applications [
Jython]Oracle
in ODI](https://image.slidesharecdn.com/helloworldwithpython-170306131841/85/Hello-World-with-Python-8-320.jpg)
![A few FAQs
11
1. What version to choose – 2.7.x or 3.x?
https://wiki.python.org/moin/Python2orPython3
2. What to use for development?
1. Any text editor (from notepad to Sublime Text)
2. IDE (Eric, Pycharm)
3. Online Web Application: Jupyter (iPython)
3. How to run?
1. Use the command line python filename [arguments]
2. Use the Python shell execfile(filename[,arguments])
4. How to debug?
pdb module https://docs.python.org/2/library/pdb.html](https://image.slidesharecdn.com/helloworldwithpython-170306131841/85/Hello-World-with-Python-11-320.jpg)
![Is Python ‘slow’ ? Why?
12
Yes – most of the raw code is slower than C/C++. But it is faster
than Ruby/JavaScript [Source: Internet]
A few reasons are:
1. Dynamic v/s Static typing
2. Interpreted v/s Compiled
3. Inefficient memory access due to its object model (list
access)
But there are hacks to overcome these: vectorised operations
[SciPy, NumPy etc.], calling compiled code, using specific
libraries etc.
Read more at: https://jakevdp.github.io/blog/2014/05/09/why-python-is-slow/](https://image.slidesharecdn.com/helloworldwithpython-170306131841/85/Hello-World-with-Python-12-320.jpg)
Hello World! with Python
- 1. BITS Pilani Pilani Campus Dhanashree N P Lecturer (Off-Campus) Computer Science 'Hello, World!' with Python 04-01-2017
- 2. DISCLAIMER This is NOT a Python programming tutorial!!
- 3. Session Overview 1. The clichéd title 2. Python & PSF 3. Features of Python 4. Success stories: using Python 5. Sample programs 6. FAQs 7. Python programs are ‘slow’ – Myth? 8. Why is Python preferred by many? 9. Reference Links
- 4. The clichéd title Any programming tutorial starts with a ‘Hello, World!’ program. Let’s use the same to answer ‘Why Python?’
- 5. Python & PSF • “hobby” programming project • Interpreter for a scripting language Dec 1989 • Python 2.0 – 16th Oct • Unicode Support, cycle- detecting GC Oct 2000 • Python 3.0 • Backward-Incompatible • Features backported to backward compatible 2.7.x, 2.6.x Dec 2008 Guido van Rossum – creator of Python – benevolent dictator for life (BDFL) Python Software Foundation(PSF) - manages the open-source licensing for Python 2.1 and later - mission is to promote, protect and advance Python; support and facilitate growth of international & diverse community of Python programmers. [2001]
- 6. Python: Features 6 Language Features High- level General Purpose Multi- Paradigm Interpreted Fully Supported • Object-oriented Programming • Structured Programming Supported by Language Features • Functional Programming • Aspect Oriented Programming Supported by Extensions • Design by Contract • Logic Programming
- 7. Python: Features 7 Features Dynamic typing Late binding ExtensibleWhite Spaces Automatic Memory Management The name Python was inspired from the series Monty Python’s Flying Circus a = 3 a = “a string” a = [‘a’, ‘list’] len(a)
- 8. Success Stories using Python 8 Web & Analysis • Mozilla • Google • Youtube • Bitly • ForecastWatch .com etc Science, Energy •ExpEYES [portable scientific laboratory] •VAMPZero [aircraft conceptual design] • Eco Mode @ SMS Siemag AG • Large Hadron Collider (CERN) •EPRI (Life on Mars - ESA) [Python powered clusters and graphics processing] Animation & Graphics • Blender • Houdini Systems Cloud, Data Centers etc. • Open Stack • Google App Engine • Flying Circus • rackspace Others • Scientific & Numeric Processing – SciPy, NumPy • Machine Learning & Analytics – SocialCorps, Innoplexus, Fractal Analysis • Automation of applications [ Jython]Oracle in ODI
- 9. A few lines of code.. 9 Examples shown use Python 2.7.12 A simple word-count program – Python shell/command line A simple word-count program using the os module – Python shell/command line
- 10. A few more lines of code.. 10 Examples shown use Python 2.7.12 Code to check the word count limit for multiple files Save this code in a file as pgm.py From the command line (Linux) – execute it using: python pgm.py Or from within IDLE shell - execfile('pgm.py')
- 11. A few FAQs 11 1. What version to choose – 2.7.x or 3.x? https://wiki.python.org/moin/Python2orPython3 2. What to use for development? 1. Any text editor (from notepad to Sublime Text) 2. IDE (Eric, Pycharm) 3. Online Web Application: Jupyter (iPython) 3. How to run? 1. Use the command line python filename [arguments] 2. Use the Python shell execfile(filename[,arguments]) 4. How to debug? pdb module https://docs.python.org/2/library/pdb.html
- 12. Is Python ‘slow’ ? Why? 12 Yes – most of the raw code is slower than C/C++. But it is faster than Ruby/JavaScript [Source: Internet] A few reasons are: 1. Dynamic v/s Static typing 2. Interpreted v/s Compiled 3. Inefficient memory access due to its object model (list access) But there are hacks to overcome these: vectorised operations [SciPy, NumPy etc.], calling compiled code, using specific libraries etc. Read more at: https://jakevdp.github.io/blog/2014/05/09/why-python-is-slow/
- 13. Why not something else? Source: https://www.python.org/about/
- 14. BITS Pilani, Deemed to be University under Section 3 of UGC Act, 1956 Questions?
- 16. BITS Pilani, Pilani Campus Python – About, Documentation, Downloads etc. - https://www.python.org/ Python Software Foundation - https://www.python.org/psf/ Logos and Usage - https://www.python.org/community/logos/ History and Timelines - https://en.wikipedia.org/wiki/Python_(programming_language) Some Success Stories and Case studies - http://brochure.getpython.info/media/releases/psf-python-brochure-vol.-i- final-download.pdf/at_download/file Some Tutorials/Books to start with: The Python Tutorial https://docs.python.org/3/tutorial/ LearnPython.org http://www.learnpython.org/ Think Python: How to Think Like a Computer Scientist – Allen. B. Downey http://www.greenteapress.com/thinkpython/html/ Python Playground: Geeky Projects for the curious Programmer – Mahesh Venkitachalam https://www.nostarch.com/pythonplayground Reference Links
- 17. BITS Pilani, Deemed to be University under Section 3 of UGC Act, 1956 17