karramsos_exceptions.py

#! /usr/bin/python

# About this snippet: Exception Handling
# Author: Sukhvinder Singh | karramsos@gmail.com | @karramsos

import exceptions

class Dog:
    __secret = 2
    
def makingErrors():
    #Output a list of all the built in exceptions that trigger error
    for i in dir(exceptions):
        print i
    
    # How to raise an exception
    # raise Exception('JustDisagreeble')
    
    # Raise an AttributeError exception
    #Puppy = Dog()
    #print Puppy.__secret
    
    # Raise an IOError exception
    #f = open('studentgrades.txt')
    
    # Raise an IndexError
    #listEx = [1,2,3]
    #print listEx[3]
    
    # Raise a KeyError exception
    #dictEx = ({'Age':35, 'Name':'Sukh'})
    #print dictEx['Age']
    
    # Raise a NameError exception
    #print monkey
    
    # Raise a SyntaxError exception
    #print "Hello'
    
    # Raise a TypeError exception
    #print 'Tomato' % 5
    
    # Raise a ZeroDivisionError exception
    #zeroDivisionErr = 1/0
    
    # Stop a ZeroDivisionError exception
    try:
        zeroDivision = 1/0
    except ZeroDivisionError:
        print "You can't divide by zero"
        
    # Stop multiple exceptions
    try:
        zeroDivision = R/0
    except (ZeroDivisionError, NameError), e:
        print "You can only divide by non-zero numbers"
        print e # Prints out the message for the first exception caught
    
    # Catch every exception
    try:
        zeroDvivsion = R/0
    except:
        print "You messed up"
    
    # What happens if no exception is raised
    try:
        halfDivision = 1.0/2.0
    except (ZeroDivisionError, NameError):
        print "You messed something up"
    else:
        print halfDivision
    
    # Use finally to always perfoem an action error or not
    
    try:
        halfDivision = 1.0/2.0
    except (ZeroDivisionError, NameError):
        print 'You messed something up'
    else:
        print halfDivision
    finally:
        print 'I always get to say something'
    
    #return

def main():
    makingErrors()

if __name__ == '__main__': main()