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1. Python for Ethical Hackers
Mohammad reza Kamalifard

2. Python Language Essentials
Part 5 :
•
Functions

3. Functions
Functions allow sections of code to be grouped better as per
functionality

4. Functions
def function(arg1,arg2=default,..):
do_something
return value

5. Functions
>>> def print5times(input):
... for count in range(0,5):
... print input
...
>>> print5times('Hello')
Hello
Hello
Hello
Hello
Hello

6. >>> print5times('Javad')
Javad
Javad
Javad
Javad
Javad
>>> print5times('Hello, World!')
Hello, World!
Hello, World!
Hello, World!
Hello, World!
Hello, World!
>>>

7. >>> def mul2(num):
return num * 2
>>>mul2(3)
6
>>>mul2(6)
12
>>>mul2(4)
8

8. $ vim testargv.py
#!/usr/bin/env python
import sys
print sys.argv
~
~

9. $ chmod a+x testargv.py
$ ./testargv.py
['./testargv.py']
$
$ ./testargv.py salam
['./testargv.py', 'salam']
$
$
$./testargv.py -h 199 --app firefox
['./testargv.py', '-h', '199', '--app', 'firefox']
$

10. $ vim function.py
#!/usr/bin/env python
import sys
def print5times(content_to_print):
for count in range(0,5):
print content_to_print
print5times(sys.argv[1])
~
~

11. $ ./function.py salam
salam
salam
salam
salam
salam
$
$ ./function.py salam hamid
salam
salam
salam
salam
salam
$
$ ./function.py 'salam hamid'
salam hamid
salam hamid
salam hamid
salam hamid
salam hamid

12. ©2013 Mohammad Reza Kamalifard.
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.