در این جلسه به بحث Exception Handling در پایتون پرداختیم PySec101 Fall 2013 J6E1 By Mohammad Reza Kamalifard Talk About: Exception Handling 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 7 :
Exception Handling

3. Exceptions
Simply put exceptions are error condtions which disrupt the normal
flow of the program
Python allows for a simple and elegant way to handle exceptions
>>> 0/0
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ZeroDivisionError: integer division or modulo by zero
Python Standard Exceptions
http://www.tutorialspoint.com/python/standard_exceptions.htm

4. Exception Handling
>>> try:
...
print 0/0
... except:
...
print 'Exception Happened'
...
Exception Happened
>>>
>>> try:
...
print 100/10
... except:
...
print 'Exception'
...
10
>>>

5. else and finally
>>> try:
...
print 10/2
... except:
...
print 'Exception'
... else:
...
print 'No Exception'
... finally:
...
print 'Cleanup code always here'
...
5
No Exception
Cleanup code always here
>>>

6. else and finally
>>> try:
...
print 10/0
... except:
...
print 'Exception'
... else:
...
print 'No Exception'
... finally:
...
print 'Cleanup code always here'
...
Exception
Cleanup code always here
>>>

7. >>> try:
...
10/0
... except ZeroDivisionError:
...
print 'Divided by Zero'
...
Divided by Zero
>>>

8. >>> try:
...
10/0
... except Exception as err:
...
print err
...
integer division or modulo by zero
>>> try:
...
print name
... except Exception as err:
...
print err
...
name 'name' is not defined
>>>

9. References
SPSE securitytube training by Vivek Ramachandran
SANS Python for Pentesters (SEC573)
Violent python
Security Power Tools
python-course.eu
----------------------------http://www.python-course.eu/exception_handling.php
http://www.tutorialspoint.com/python/python_exceptions.htm
http://www.wilfred.me.uk/blog/2013/11/03/no-naked-excepts/

10. 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 .