در این جلسه از کلاس به ساختار های داده Set, Tuple, Dictionary پرداختیم PySec101 Fall 2013 J3E1 By Mohammad Reza Kamalifard Talk About : Sets,Tuples and Dictionary Data Types in Python

1. Python for ethical hackers
Mohammad reza Kamalifard
kamalifard@datasec.ir

2. Python language essentials
Module 1:
Introduction to Python and Setting up an Environment for Programing
Part 3 :
Lists,Tuple, Sets, Dictionaries

3. Lists
• Collection of objects which can be heterogeneous
• Lists are like Arrays in C/C++ and Java, but Python lists are by far
more flexible than classical arrays.
>>> my_list = ['English', 'Farsi', 'Arabic', 'German',]
>>> my_list[0]
'English'
>>> my_list[1]
'Farsi'
>>> my_list[-1]
'German'
>>> my_list[2:3]
['Arabic']
>>> my_list[::-1]
['German', 'Arabic', 'Farsi', 'English']

4. Lists
my_list = [1,2,3,4]
my_list= [1, 'reza', 'PYSEC101', 2.5]
>>>my_list= [1, [3,4, 'Hello'], [3,4], 2, 3]
>>>len(my_list)
5
>>>len(my_list[1])
3
>>>

5. List Operations
• Concatenate [1,2] + [3,4] = [1,2,3,4]
• Append – list.append()
• Extend – list.extend()
• Reverse – list.reverse()
• Pop – list.pop()
• Insert – list.insert(index,item)
• Delete – del list[index]

6. >>>
>>>
>>>
>>>
[1,
>>>
>>>
[1,
>>>
>>>
[1,
>>>
>>>
[1,
>>>
my_list1 = [1, 2]
my_list2 = [3, 4]
my_list = my_list1 + my_list2
my_list
2, 3, 4]
my_list.append(5)
my_list
2, 3, 4, 5]
my_list.append([6, 7])
my_list
2, 3, 4, 5, [6, 7]]
my_list.extend([8, 9])
my_list
2, 3, 4, 5, [6, 7], 8, 9]

7. >>>
[1,
>>>
9
>>>
[1,
>>>
>>>
[1,
>>>
>>>
[1,
>>>
my_list
2, 3, 4, 5, [6, 7], 8, 9]
my_list.pop()
my_list
2, 3, 4, 5, [6, 7], 8]
my_list.insert(2, 12)
my_list
2, 12, 3, 4, 5, [6, 7], 8]
del my_list[2]
my_list
2, 3, 4, 5, [6, 7], 8]

8. Tuples
• Tuples are similar to list but immutable
• Can Convert from list to tuple and vice versa
• tuple(list)
• list(tuple)
>>>my_tuple = ('reza', 1362, 22, 'aban')
>>>my_tuple
('reza', 1362, 22, 'aban')
>>> my_tuple[2]
22
>>> my_tuple[2] = 14
Traceback (most recent call last):
File "<pyshell#7>", line 1, in <module>
my_tuple[2] = 14
TypeError: 'tuple' object does not support item assignment
>>>

9. >>> post_data = tuple(['PYSEC101', 25, 100, 3])
>>> post_data
('PYSEC101', 25, 100, 3)
>>>
sequence unpacking
>>> post_name, view, comments, upvotes = post_data
>>> post_name
'PYSEC101'
>>>
>>> view
25
>>> comments
100
>>> upvotes
3

10. Sets
• Unordered collection of unique objects
• List to set : b = set(a)
• Set to list : a = list(b)
• Set Operations
• Union: a | b
• Intersection: a & b
• Difference: a - b

11. Sets
>>> set1 =
>>> set1
set([1, 2,
>>>
>>> set2 =
'Reza', 2,
>>> set2
set([1, 2,
>>>
>>> set3 =
>>> set3
set([3, 4,
set([1, 2, 3, 3, 2])
3])
set(['Hamid', 'Ali', 'Reza', 'Hamid',
5, 2, 1, 3, 5])
3, 5, 'Ali', 'Reza', 'Hamid'])
set([3, 4, 5])
5])

12. Sets
>>> set1 | set3
set([1, 2, 3, 4, 5])
>>>
>>> set1 & set3
set([3])
>>>
>>> set1 - set3
set([1, 2])
>>>
>>> set3 - set1
set([4, 5])

13. Dictionaries
• Unordered key-value pairs
• Keys are unique and immutable objects
• Value can change
• Check if a given key is present
• dict.has_key(key)
• key in dict
{ 'key' : 'value' }
>>>my_dic1 = {}
>>>my_dic1['name'] = 'reza'
{'name': 'reza'}
>>> my_dic2 = {'name' : 'reza', 'age' : 23}
>>> my_dic2
{'age': 23, 'name': 'reza'}

14. Dictionaries
>>> user = {'name': 'reza', 'age': 23, 'from': 'Iran'}
>>> user
{'age': 23, 'from': 'Iran', 'name': 'reza'}
>>>
>>> user.has_key('name')
True
>>> user.has_key('hobby')
False
>>> 'name' in user
True
>>> 'Iran' in user
False

15. Dictionaries
• Get tuple of items : dict.items()
• Get list of keys : dict.keys()
• Get list of values : dict.values()
• Get a particular item : dict.get(key)
• Item deletion:
• All item : dict.clear()
• one item: del dict[key]

16. Dictionaries
>>> user.keys()
['age', 'from', 'name']
>>> user.values()
[23, 'Iran', 'reza']
>>> user.items()
[('age', 23), ('from', 'Iran'), ('name', 'reza')]
>>>
>>> user.get('age')
23
>>> user['age']
23

17. Dictionaries
Add new Value
>>> user['Fav_Site'] = 'Twitter.com'
>>> user
{'age': 23, 'from': 'Iran', 'name': 'reza', 'Fav_Site':
'Twitter.com'}
>>>
Delete an item
>>> del user['Fav_Site']
>>> user
{'age': 23, 'from': 'Iran', 'name': 'reza'}
>>>
>>> user.clear()
>>> user
{}

18. Getting Help
• Getting Help on Methods and etc.
• dir() : lists all attributes
• help(string.replace) – list method help

19. dir()
>>> name = 'reza'
>>> dir(name)
['__add__', '__class__', '__contains__', '__delattr__', '__doc__', '__eq__',
'__format__', '__ge__', '__getattribute__', '__getitem__', '__getnewargs__',
'__getslice__', '__gt__', '__hash__', '__init__', '__le__', '__len__',
'__lt__', '__mod__', '__mul__', '__ne__', '__new__', '__reduce__',
'__reduce_ex__', '__repr__', '__rmod__', '__rmul__', '__setattr__',
'__sizeof__', '__str__', '__subclasshook__', '_formatter_field_name_split',
'_formatter_parser', 'capitalize', 'center', 'count', 'decode', 'encode',
'endswith', 'expandtabs', 'find', 'format', 'index', 'isalnum', 'isalpha',
'isdigit', 'islower', 'isspace', 'istitle', 'isupper', 'join', 'ljust',
'lower', 'lstrip', 'partition', 'replace', 'rfind', 'rindex', 'rjust',
'rpartition', 'rsplit', 'rstrip', 'split', 'splitlines', 'startswith',
'strip', 'swapcase', 'title', 'translate', 'upper', 'zfill']
>>>

20. help()
• Help on built-in function replace:
• help(name.replace)
replace(...)
S.replace(old, new[, count]) -> string
Return a copy of string S with all occurrences of substring
old replaced by new. If the optional argument count is
given, only the first count occurrences are replaced.
(END)

21. References
SPSE securitytube training by Vivek Ramachandran
SANS Python for Pentesters (SEC573)
Violent python
Security Power Tools
python-course.eu
----------------------------http://www.tutorialspoint.com/python/python_lists.htm
http://www.tutorialspoint.com/python/python_tuples.htm
http://www.tutorialspoint.com/python/python_dictionary.htm
http://www.python-course.eu/sequential_data_types.php
http://www.python-course.eu/sets_frozensets.php

22. This work is licensed under the Creative Commons Attribution-NoDerivs 3.0 Unported License.
To view a copy of this license, visit
http://creativecommons.org/licenses/by-nd/3.0/
Copyright 2013 Mohammad Reza Kamalifard
All rights reserved.
Go to Kamalifard.ir/pysec101 to Download Slides and Course martials .