Basic Python Programing Session 1

Python is a widely used general-purpose, high-level programming language.Python supports multiple programming paradigms, including object-oriented, imperative and functional programming or procedural styles. It features a dynamic type system and automatic memory management and has a large and comprehensive standard library

Transcript

1. Python Programming
2. Me Danang Heriyadi – Open Source Addict – Information Security Trainer @hatsecure – Penetration tester – Security Engineer – Security Researcher
3. 0x01 Short History ◾ Created by Guido van Rossum ◾ Python was conceived in the late 1980s ◾ Implementation was started in December 1989 ◾ Python 2.0 – We are still using v2.x ◾ Python 3.0 – Future
4. 0x02 Why use Python ? ◾ Fast scripting ◾ The most simpler ◾ Rich functionality ◾ Multi platform ◾ Open Source
5. 0x03 Information Security Proof of the concept Rich library support Many hacker use python
6. 0x04 Why use Python v2 ? ◾ Most tools & library not support in v3 ◾ Will take couple of years to support everything ◾ Any platform still use v2
7. 0x05 Python Execution ◾ Interactive root@kali:~# python >>> print “Hello world” ◾ Script root@kali:~# python helloworld.py
8. 0x06 Scripting mode ◾ Tell to shell this script executed by – /usr/bin/python
9. 0x07 Variable and Object >>> myvar = “Python programming” >>> print myvar Variable Object References
10. 0x07 Where is the Object ? ◾ id(variable) – To display where object saved in memory ◾ hex(id(variable)) – To display in hex address, where object saved in memory. ◾ myvar.__repr__ – To display in hex address, where object saved in memory.
11. 0x08 Data Types ◾ Numbers – Integer, float, etc ◾ Strings – “bla bla bla” ◾ List – [ “one” , ”two” , ”three” ]
12. 0x08 Data Types ◾ Tuples – ( “mytuple1” , “mytuple2” ) ◾ Dictionary - { “cat” : “kucing” , “dog” : “anjing” }
13. Numbers ◾ Math Operators : +, -, *, / ◾ Bitwise Operators : x|y, x^y, x&y ◾ (> , < , >=, <=, ==) ◾ Logical Operators : a and b, a or b, not a
14. Strings ◾ name = “Danang Heriyadi” ◾ name = “Danang ” “Heriyadi” ◾ name = (“Danang” ◾ “ Heriyadi”)
15. String Operations ◾ Concatenating strings – string1 + string2 ◾ Repeat the string – string * int ◾ Slicing the string – string[start:end:steps]
16. String Methods ◾ String.split(...) ◾ String.replace(...) ◾ String.find(...)
17. Integer to string ◾ Short way – str(10000) ◾ Hard way >>> integer = 100 >>> print “Nilai : %s “ % integer
18. List ◾ Like array ◾ Support stack operations ◾ Data type support : String, Numbers, Boolean
19. List Operations ◾ List.append(x) – Add an item to the end of the list ◾ List.extend(L) – Extend the list by appending all the items in the given list ◾ List.insert(i, x) – Insert an item at a given position
20. List Operations ◾ List.pop(x) – Remove the first item from the list and return it ◾ List.index(x) – Get index of the first item where value is x ◾ List.remove(x) – Remove the first item from the list whole value is x
21. List Operations ◾ List.reverse() – Reverse the elements of the list ◾ List.sort() – Sort the items of the list, in place
22. Tuples ◾ Like array ◾ Immutable ◾ Can't modified
23. Parsing tuple #1
24. Parsing tuple #2
25. Dictionary ◾ Associative memory or arrays ◾ Indexed by a keys ◾ The keys are immutable object
26. How to use dictionary ? ◾ First method
27. How to use dictionary ? ◾ second method
28. Getting Help ◾ dir(...) – List all attributes ◾ help(...) – List method help
29. 0x09 Function ◾ if (condition1): …. ◾ elif (condition2): ... ◾ else: ...
30. Conditions ◾ ( x > y, x < y, x >= y, x <= y, x == y, x != y ) ◾ True ◾ False
31. Example #!/usr/bin/python string = raw_input('Please type yes or no: ') if (string == 'yes'): print “ Okey...thank you ” elif (string == 'no'): print “ Oh......sorry ” else: print “ You don't have choice? ”
32. 0xA While Loop ◾ while (conditions): … ◾ If conditions is false, the loops will stopped ◾ If execute “break”, the loops will stopped
33. Example #1 #!/usr/bin/python condition = True count = 0 while(condition): print "%s day – Fossil 2014" % count count+=1 if (count == 10): condition = False
34. Example #2 #!/usr/bin/python condition = True count = 0 while(condition): print "%s day – Fossil 2014 " % count count+=1 if (count == 10): break
35. Example #3 #!/usr/bin/python string = raw_input('Count of loop (integer): ') loops = int(string) count = 0 while(count < 10): print "%s day – Amikom 2014 " % count count+=1
36. 0xB For Loops ◾ In python we need range() syntax. ◾ range(lower, upper, step) – Create list ◾ List, Tuple, or String
37. Example >>> range(10) [0,1,2,3,4,5,6,7,8,9] >>> range(2,10) [2,3,4,5,6,7,8,9] >>> range(2,10,2) [2, 4, 6, 8]
38. For in Range #!/usr/bin/python r = range(10) for x in r: print x
39. For in List #!/usr/bin/python mlist = [ “h” , ”e” , ”l” , ”l” , ”o” ] for z in mlist: print z
40. For in Tuple #!/usr/bin/python mtuple = ( “h” , ”e” , ”l” , ”l” , ”o” ) for z in mtuple: print z
41. For in String #!/usr/bin/python string = “helloworld” for ww in string: print ww
42. 0xC Function ◾ Allow sections of code to be grouped ◾ Efficient ◾ Function will execute when the function is called
43. Define the Function #!/usr/bin/python def function1(fossil_text): print fossil_text new_text = fossil_text + “ is funny“ return new_text print function1( “danang” )
44. Other Example #!/usr/bin/python def function1(upper): x = 0 while(x < upper): print x else: print “Finished” function1(10)
45. Other Example #!/usr/bin/python def function1(upper=5): for x in range(upper): print x else: print “Finished” function1()
46. Other Example #!/usr/bin/python def function1(upper = ”fossil”, lower): print upper, lower function1(lower = “is my way”)
47. 0xD Group and Class ◾ If something has been done before, why should you do it again? ◾ Classes are like modules or library ◾ Modules are like dictionary
48. Example #1 #!/usr/bin/python def function1(): print “This is function” ◾ Save the file as “function.py”
49. Example #2 #!/usr/bin/python class Fossil: '''Ini adalah kelas Fossil''' def __init__(self, var1, var2): '''untuk instansiasi, biasanya untuk deklarasi variabel agar bisa diakses disemua fungsi''' self.var1 = var1 def variable(self): ''' Jika dijalankan pasti error :P ''' print “Variable 1 is “ + self.var1 print “Variable 2 is “ + var2
50. Exercise >> import Calculator >> d = Calculator.init(10,5) >> d.sum() Result is 15 >> d.min() Result is 5 >> d.higher() 10