This document discusses exception handling in Python. It explains that exceptions are error conditions that disrupt normal program flow. Python allows exceptions to be handled elegantly using try and except blocks. It demonstrates how to handle specific exception types like ZeroDivisionError, and how else and finally clauses work with exception handling. The goal is to provide a simple introduction to exception handling in Python.

1. Python for Ethical Hackers
Mohammad reza Kamalifard

2. Python Language Essentials
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. 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.