Python for High School Programmers

Python for High School Programmers April 06, 2013 Sivasubramaniam Arunachalam @sivaa_in

It’s me! • Application Developer • Web/Enterprise/Middleware/B2B • Java/Java EE, Python/Django • 2002 • Technical Consultant • Process Mentor • Speaker

It’s about you! Have you written a code recently? Yes / No / Never It doesn’t matter!

Agenda • Background • Concepts • Basics • Demo

for / else for ( int i = 0; i < 10; i++ ) { …… } else { …… }

Guido van Rossum http://www.python.org/~guido/images/guido91.gif

https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcRsHF89zT2tSdsm45hFYDaJPocfpwIM_Eh76pjKbTzZI2dxArWa

http://upload.wikimedia.org/wikipedia/en/9/9a/CompleteFlyingCircusDVD.jpg

Zen of Python • 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. • 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. • 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!

Portable • Servers / Desktops / Mobile Devices / Raspberry Pi • Windows/Unix/Linux/Mac • Pre-installed in Mac and Linux

Multi-Language Support • CPython • Jython • IronPython

Multi-Paradigm • Functional / Procedural / Object Oriented

More Productivity ...the lines of Python code were 10% of the equivalent C++ code. - Greg Stein

Where I can use? • Stand-Alone Application • Desktop/GUI Application • Web Application • XML Processing • Database Application • Network Application • Scientific Application • Gaming • Robotics

Installation / Tools • Interpreter • Script Editor

Optimized Code • Faster Execution • Less CPU Cycles

Increment ‘i’ by 1 i++ i=i+1 ADD #1,A1 [A1] ← [A1] + 1

Machine Instructions / Line of Code (LoC)

Assembly Language 1-2 System Languages 3-7 Scripting Languages 100 - 1K

Current Versions 2.7.3 & 3.3.0

How to run? C:> python my_program.py

Let’s Start • Start / Exit • Simple print • Zen of Python • Keywords • Help

<type> var_name = val; int int_ex = 10; int_ex = 10

int_ex = 10 long_ex = 1000000000000L float_ex = 1.1 string_ex = “Welcome” boolean_ex = True

print type(int_ex) print type(long_ex) print type(float_ex) print type(string_ex) print type(boolean_ex)

boolean_one = True boolean_two = False print boolean_one and boolean_two print boolean_one or boolean_two print not boolean_two

int_one = 11 int_two = 5 print int_one / int_two print float(int_one) / float(int_two) print float(int_one) / int_two print int_one / float(int_two)

int_ex = 11 float_ex = 8.8 boolean_ex = True print float (int_ex) print int (float_ex) print int (boolean_ex)

int_one = 11 int_two = 5 print int_one + int_two print int_one - int_two print int_one * int_two print int_one / int_two print int_one % int_two print int_one ** int_two

int_one = 11 int_two = 5 print int_one > int_two print int_one >= int_two print int_one < int_two print int_one <= int_two print int_one == int_two print int_one != int_two

import math (or) from math import sqrt

int_one = 11 int_two = 5 import math print math.sqrt (int_one) import math from math import factorial print math.pi print factorial (int_two)

raw_input() (or) raw_input([prompt_string])

user_input = raw_input() print “You have Entered “ , user_input user_input = raw_input(“Input Please : “) print type(user_input)

int_one = raw_input (“Number 1 : “) int_two = raw_input (“Number 2 : “) print int_one + int_two print int(int_one) + int(int_two)

‘ ’ “ ” “““ ””” ‘‘‘ ’’’

print ‘ example text ’ print “ example text ” print “““ example of long ….. …. text ””” print ‘‘‘ example of long ….. …. text ’’’

print ‘ String with “double” quotes ’ print “String with ‘single’ quote ” print ““ Hey what‘s up”” print ‘“ Hey what‘s up”’ print “““ “ Hey what‘s up ” ””” print ‘‘‘ “ Hey what‘s up ” ’’’

0 1 2 3 4 5 10 10.1 ‘A’ ‘ABC’ 2 True -6 -5 -4 -3 -2 -1

0 1 2 3 4 5 10 10.1 ‘A’ ‘ABC’ 2 True -6 -5 -4 -3 -2 -1 list_ex = [ 10, 10.1, ‘A’, ‘ABC’, 2, True ] tuple_ex = ( 10, 10.1, ‘A’, ‘ABC’, 2, True )

0 1 2 3 4 5 10 10.1 ‘A’ ‘ABC’ 2 True -6 -5 -4 -3 -2 -1 tuple_ex = ( 10, 10.1, ‘A’, ‘ABC’, 2, True ) • tuple_ex[0] • tuple_ex[-6] • tuple_ex[1] • tuple_ex[-5] • tuple_ex[2] • tuple_ex[-4] • tuple_ex[3] • tuple_ex[-3] • tuple_ex[4] • tuple_ex[-2] • tuple_ex[5] • tuple_ex[-1]

tuple_ex = (100, ) list_ex = [100, ] tuple_ex = tuple(‘gobi’) list_ex = list(‘gobi’)

0 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 10 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 list_ex = [1, 2, 3, 4, 5, 6, 7, 8, 9 , 10, ] print list_ex[:3] print list_ex[3:] print list_ex[:-3] print list_ex[-3:]

0 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 10 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 list_ex = [1, 2, 3, 4, 5, 6, 7, 8, 9 , 10, ] print list_ex[0:1] print list_ex[0:2] print list_ex[-2:-1] print list_ex[-3:-1]

0 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 10 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 list_ex = [1, 2, 3, 4, 5, 6, 7, 8, 9 , 10, ] print list_ex[0:10:2] print list_ex[1:10:2]

0 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 10 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 list_ex = [1, 2, 3, 4, 5, 6, 7, 8, 9 , 10, ] print len(list_ex) print max(list_ex) print min(list_ex)

city = list(‘gobi’) city[len(city):] = “chettipalayam” “”.join(city)

ipl_teams = [‘CSK’, ‘DD’, ‘KXIP’, ‘KKR’, ‘MI’, ‘PWI’, ‘RR’, ‘RCB’, ‘SRH’,] “, ”.join(ipl_teams)

str_ipl_teams = “, ”.join(ipl_teams) list_ipl_teams = list(str_ipl_teams ) list_ipl_teams[str_ipl_teams.rfind(", ")] = " and“ print "".join(list_ipl_teams)

ipl_teams = [‘CSK’, ‘DD’, ‘KXIP’, ‘KKR’, ‘MI’, ‘PWI’, ‘RR’, ‘RCB’,] ipl_teams.append(‘SRH’)

ipl_teams = [‘CSK’, ‘DD’, ‘KXIP’, ‘KKR’, ‘MI’, ‘PWI’, ‘RR’, ‘RCB’,] ipl_teams.remove(‘SRH’) del ipl_teams[-1]

ipl_teams = [‘CSK’, ‘DD’, ‘KXIP’, ‘KKR’, ‘MI’, ‘PWI’, ‘RR’, ‘RCB’,] ipl_teams.insert (1, ‘SRH’)

ipl_teams = [‘CSK’, ‘SRH’, ‘DD’, ‘KXIP’, ‘KKR’, ‘MI’, ‘PWI’, ‘RR’, ‘RCB’,] ipl_teams.sort()

list_ex = [1, 2, 3, 4, 5] print 3 in list_ex1

title_winners = [‘CSK’, ‘RR’, ‘DC’, ‘KKR’] print ‘CSK’ in title_winners

my_city = “Gobichettipalayam” print ‘chetti’ in my_city

i=1 while i <= 10: print i, i=i+1

for i in range(1, 11): print i,

for i in range(11): if i % 2 == 0: print i

for i in range(11): if i % 2 == 0: print “Even : ”, i else : print “Odd: ”, i

for i in range(11): if i == 0: pass elif i % 2 == 0: print “Even : ”, i else : print “Odd: ”, i

for i in range(11): if i == 0: continue elif i % 2 == 0: print “Even : ”, i else : print “Odd: ”, i

for i in range(11): if i == 0: break elif i % 2 == 0: print “Even : ”, i else : print “Odd: ”, i

title_winners = ['CSK', 'RR', 'DC', 'KKR'] for team in title_winners: print team,

for i in range(11): print i, else: print “No Break executed in for”

list_ex = [] if list_ex: print “List is not Empty” else: print “List is Empty”

list_ex = None if list_ex: print “List is not None” else: print “List is None”

Thank You! siva@sivaa.in bit.ly/sivaa_in bit.ly/sivasubramaniam

References http://www.slideshare.net/narendra.sisodiya/python-presentation-presentation http://www.f-106deltadart.com/photo_gallery/var/albums/NASA-Research/nasa_logo.png?m=1342921398 http://www.seomofo.com/downloads/new-google-logo-knockoff.png http://www.huntlogo.com/wp-content/uploads/2011/11/US-Navy-Logo.png http://3.bp.blogspot.com/_7yB-eeGviiI/TUR471pyRpI/AAAAAAAAIBI/X705lo5Gjqc/s1600/Yahoo_Logo24.JPG http://www.thetwowayweb.com/wp-content/uploads/2012/09/youtube_logo.png

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