Python 3 Intro Presentation for NEWLUG
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Python 3 Intro Presentation for NEWLUG

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An introduction to programming in Python 3, aimed at people who are new to programming.

An introduction to programming in Python 3, aimed at people who are new to programming.

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Python 3 Intro Presentation for NEWLUG Python 3 Intro Presentation for NEWLUG Presentation Transcript

  • Python 3 for n00bs
      NEWLUG Presentation: June 17th, 2010 Presented by: Ross Larson
    • Software Developer, Cooperative Resources International
  • So, What is Python, anyways?
    • Named in honor of Monty Python
    • Created in the late 80's by Guido van Rossum View slide
    • Designed to be fun to use, as well as flexible.
    View slide
  • Python, a Brief version history
    • Conceived in the late 80's, implementation started in December 1989
    • Version 2.0 – October 16th, 2000
      • Development shifts to a more transparent, community-backed process
    • Version 3.0 – December 3rd, 2008
      • Backwards incompatible with previous versions
      • Some developers still choose to use Python 2.6
  • So, why use Python?
    • Lots of Stuff Uses it!
      • Django
      • PyGame
      • Google App Engine
      • Quickly
      • PyQt
      • PyGtk
      • Zope
      • And....more!
  • OK! Great! I'm in! Now what?
    • To install Python 3 in Ubuntu, search for ”python3” and install it via synaptic.
    • Development can be done either in a text editor like gedit, vim, or gvim
    • Integrated Development Environments (IDEs) are available, as well (IDLE, PyDev for Eclipse).
    • I wrote a PyDev install HOWTO on my blog:
      • http://bit.ly/pydev-NEWLUG
  • Uh, I'm lost! Is there any documentation?
    • Plenty!
      • Python website ( http://docs.python.org/py3k/ )
      • Dive into Python ( http://diveintopython3.org )
      • Koders Code Search ( http://www.koders.com/ )
      • YouTube tutorials
      • Google
      • IRC channels
  • The Zen of Python - by Tim Peters
    • Beautiful is better than ugly.
    • Explicit is better than implicit.
    • Simple is better than complex.
    • Complex is better than complicated.
    • Flat is better than nested.
    • Sparse is better than dense.
    • Readability counts.
  • Zen of Python, Part 2
    • Special cases aren't special enough to break the rules.
    • Although practicality beats purity.
    • Errors should never pass silently.
    • Unless explicitly silenced.
    • In the face of ambiguity, refuse the temptation to guess.
  • Zen of Python, Part 3
    • There should be one-- and preferably only one --obvious way to do it.
    • Although that way may not be obvious at first unless you're Dutch.
    • Now is better than never.
    • Although never is often better than right now.
    • If the implementation is hard to explain, it's a bad idea.
    • If the implementation is easy to explain, it may be a good idea.
    • Namespaces are one honking great idea -- let's do more of those!
  • OK, Let's open up Python3
    • To open the Python 3 Interpreter, type ”python3” at the command line.
    • woo@beast:~$ python3
    • Python 3.1.2 (r312:79147, Apr 15 2010, 15:35:48)
    • [GCC 4.4.3] on linux2
    • Type "help", "copyright", "credits" or "license" for more information.
    • >>>
  • Now, Let's write a simple program!
      >>> print("Hello NEWLUG!") Hello NEWLUG!
  • OK, I'm still with you.
    • How about variables?
    • >>> newlug = "San Dimas High School Football Rules!"
    • >>> print(newlug)
    • San Dimas High School Football Rules!
  • OK, fine. But what if I don't want to type everything when I run it?
    • Open a new empty file.
    • Name it ”helloNEWLUG.py”
    • Insert:
    • print("Hello NEWLUG!")
    • Save and Close the file.
  • OK. Fine. Whatever.
    • From the command line, type:
      • python3 helloNEWLUG.py
  • Wow, now I'm a programmer!
      Well, kind of. There is quite a bit more to learn.
    • Everything is an Object!
    • Data types (String, Boolean, Tuple, Dictionary, etc)
    • Functions
    • Arguments
    • User Input
    • Exception Handling and Redirection
    • Loops
  • Soon, this will make sense:
  • Watch out for....
    • Indentation and Spacing
      • Never use combinations of tabs and spaces!
      • ”If you use both tabs and spaces in a Python program, that makes you a bad person” - Brian Blazer
    • Different Versions of Python
      • The default ”python” is often Python 2.6!
      • Python scripts can be converted to Python 3
    • The ”loosey-goosey” nature of Python
      • Python gives you enough rope to hang yourself.
  • ...And now for something completely different
  • Questions?