The document discusses a Python workshop presented by Sian Lerk Lau. It introduces Python and some of its common uses. The workshop covers why to code in Python, setting up a Python environment, Python basics like data types and control structures, and building a simple calculator program as a real example. Attendees are encouraged to ask questions during the Q&A session.

1. PYTHON
& YOU
NETWORK WEEK 2015 WORKSHOP

2. SIAN LERK LAU
linkedin.com/in/sianlerk
sianlerk.lau@onapp.com | kiawin@gmail.com
Software Engineer
Volunteer
Educator-in-Exile

4. https://twitter.com/OnApp - https://facebook.com/OnApp

5. WONDERFUL THINGS WE DO =)
Python, Java, Ruby, Lua, Nginx, Wowza, Puppet, Vagrant,
Docker, Debian, Cucumber, RabbitMQ, MariaDB, MongoDB,
ELK, etc.

6. WE’RE HIRING!
SYSADMIN as integral role in managing and
develop tools for our ecosystem
DEV as engineering role in creating bleeding edge
applications for our ecosystem
YES, INTERNS TOO!

7. R U
REHDY
TO PYTHON*

8. FIVE
DEADLY
SINS
OF COMPUTER SCIENCE

9. I DO EVERYTHING
EXCEPT
int main(void);
NO. 5

10. I DO CODING
EXCEPT
for (;;);
NO. 4

11. I DO EVERYTHING
EXCEPT
MATHS
NO. 3

12. I DO NOTHING
EXCEPT
<NAME YOUR LANGUAGE>
NO. 2

13. I DO NOTHING
EXCEPT
MY {WORK, STUDY}
NO. 1

14. EVER
CHANGING
INDUSTRY
OF COMPUTER SCIENCE

15. SOFTWARE
DEVELOPMENT
IS ABOUT
LEARNING
NO. 5

16. SOFTWARE
DEVELOPMENT
IS ABOUT
ENGINEERING
NO. 4

17. SOFTWARE
DEVELOPMENT
IS ABOUT
SPEED
NO. 3

18. SOFTWARE
DEVELOPMENT
IS ABOUT
BUSINESS
NO. 2

19. SOFTWARE
DEVELOPMENT
IS ABOUT
COMMUNITY
NO. 1

20. SOFTWARE
DEVELOPMENT
IS ABOUT
YOU
NO. 0

21. DO.
* WHY PYTHON
* THE ENVIRONMENT
* PYTHON 101
* CONTROL STRUCTURES
* A REAL PROGRAM

22. WHY*
CODE IN PYTHON

23. EASY TO UNDERSTAND
CONCISE SYNTAX
MULTI-PURPOSE
STRENGTH OF PYTHON

24. GOOGLE-ABLE!
WELL SUPPORTED LIBS
FAST TO DELIVER
STRENGTH OF PYTHON

25. ENV*
PYTHON ENVIRONMENT

26. # INSTALL PACKAGES
$ sudo apt-get install python-pip
python-virtualenv
# SETUP ENVIRONMENT
$ virtualenv workshop-env
# ENABLE ENVIRONMENT
$ source workshop-env/bin/activate
ENV* - ENVIRONMENT ISOLATION

27. 101*
PYTHON - DATA TYPES

28. # DECLARE-LESS TYPED
>>> a = 1
>>> print a
1
>>> type(a)
<type 'int'>
101* - DATA TYPES

29. # MORE TYPES - '' and ""
>>> b = 'a'
>>> c = 'abc'
>>> d = "abc"
# QUIZ: WHAT DATA TYPES ARE b, c and d?
>>> type(b)
>>> type(c)
>>> type(d)
101* - DATA TYPES

30. # MORE TYPES
# bool, NoneType, float, long
>>> e = True
>>> f = False
>>> g = None
>>> h = 1.0
>>> i = 1L
# QUIZ: WHAT IS None?
101* - DATA TYPES

31. 101*
PYTHON - COLLECTIONS

32. # COLLECTION 1: LIST
>>> a = [1, 2, 3]
>>> b = list()
>>> b.append(1)
>>> b.append(2)
>>> b.append(3)
# QUIZ: How do we retrieve the value?
# QUIZ: Is a and b same?
101* - DATA TYPES

33. # SAME - EQUALITY or IDENTITY?
>>> a == b
True
>>> a is b
False
# QUIZ: WHAT IS THE DIFF
# BETWEEN == AND is
101* - DATA TYPES

34. # COLLECTION 2 - TUPLE
>>> c = (1, 2, 3)
>>> d = 1, 2, 3
# QUIZ: SO AGAIN, IS c SAME with d?
101* - DATA TYPES

35. # COLLECTION 3: dict
>>> e = {1: 11, 2: 22}
>>> e[1]
>>> e[2]
# QUIZ: IS THIS AN array?
# QUIZ: MUST THE key BE int?
101* - DATA TYPES

36. # COLLECTION 4: set
>>> f = set()
>>> f.add(1)
>>> f.add(2)
>>> f.add(3)
# QUIZ: WHAT IS THE DIFF
# BETWEEN list AND set?
101* - DATA TYPES

37. 101*
PYTHON - CONTROL STRUCTURES

38. 101* - DATA TYPES
# if, else, elif
>>> a = 2
>>> if a == 1:
... print "hello"
... elif a == 2:
... print "world"
>>>

39. 101* - DATA TYPES
# if, else, elif CONTINUES
>>> a = 1
>>> if a == 1:
... print "hello"
... else:
... print "world"
>>>

40. 101* - DATA TYPES
# for LOOP
>>> for i in [1, 2, 3]:
... print i
>>> for j in range(1,3):
... print j
# QUIZ: WHAT DO YOU SEE WHEN print j

41. 101* - DATA TYPES
# for LOOP
>>> for i in (1, 2, 3):
... print i
>>> for k,v in {1: 11, 2: 22}.iteritems():
... print k, v
# QUIZ: WHAT DO YOU SEE WHEN print k, v

42. 101* - DATA TYPES
# list comprehension
>>> a = [1,2,3,4,5]
>>> b = [i+1 for i in a]
# QUIZ: WHAT IS THE VALUE OF b?

43. 101* - DATA TYPES
# list comprehension
>>> a = [1,2,3,4,5]
>>> b = [i for i in a if i % 2 == 0]
# QUIZ: WHAT IS THE VALUE OF b?

44. PROG*
A REAL PROGRAM, NOW

45. # CREATE AN EXECUTABLE FILE
$ touch calculator.py
$ chmod +x calculator.py
# QUIZ: MUST YOU END THE FILENAME WITH
# A FILE EXTENSION?
PROG* - A REAL PROGRAM

46. # IMPROVISE IT
$ vim calculator.py
$ nano calculator.py
<or, use your favourite text editor>
# RUN IT
$ ./calculator.py
PROG* - A REAL PROGRAM

47. Q&A*
ASK ME ANYTHING