[Tutor] Consolidate reused code blocks

[David]

Hi Everyone,

I have a simple todo list program with functions to add, delete, edit 
and print out a list of todo's. I need to understand how to remove the 
same blocks of code I use in each function. Should I create a class for 
the same block of code I am including in each function? Here are two of 
the functions;

def main():
     print '\nYour current Todo list is: \n'
     if os.path.exists('todo.dat'):
         try:
             fname = open('todo.dat', 'rb')
             data = cPickle.Unpickler(fname)
             todo = data.load()
             load_todo(todo)
             for k, v in todo.iteritems():
                 print k, v[0], v[1]
         finally:
             fname.close()
             menu()
     else:
         todo = {}
         print "You have 0 todo's"
         menu()

def del_todo():
     if os.path.exists('todo.dat'):
         try:
             fname = open('todo.dat', 'rb')
             data = cPickle.Unpickler(fname)
             todo = data.load()
             load_todo(todo)
         finally:
             fname.close()
     else:
         todo = {}

     try:
         print '\nYour current Todo list is: \n'
         for k, v in todo.iteritems():
             print k
         answer = raw_input('\nWhich Todo do you want to remove? ')
         del todo[answer]
         print '\nDeleted Todo', answer
         print '\nYour current Todo list is: \n'
         for k, v in todo.iteritems():
             print k, v[0],v[1]
         load_todo(todo)
     except KeyError, e:
         print '\nError! Please enter the Todo to be removed.\n'
         print 'Case and spaces are important.'

Here is the whole thing :)
http://linuxcrazy.pastebin.com/f4206de5a

Thanks for your time,
-david

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