Author Dusty Phillips Reviewers

return "".join((str(c) for c in self.characters))
This code uses a generator expression, which we'll discuss in 
Chapter 9
, 
The Iterator 
Pattern
. It's a shortcut to perform a specific action on all the objects in a sequence.
Finally, we also need to check 
Character.character
, instead of just the string 
character we were storing before, in the 
home
and 
end
functions when we're looking 
to see whether it matches a newline character:
def home(self):
while self.document.characters[
self.position-1].character != '\n':
self.position -= 1
if self.position == 0:
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When to Use Object-oriented Programming
[
 152 
]
# Got to beginning of file before newline
break
def end(self):
while self.position < len(
self.document.characters) and \
self.document.characters[
self.position
].character != '\n':
self.position += 1
This completes the formatting of characters. We can test it to see that it works:
>>> d = Document()
>>> d.insert('h')
>>> d.insert('e')
>>> d.insert(Character('l', bold=True))
>>> d.insert(Character('l', bold=True))
>>> d.insert('o')
>>> d.insert('\n')
>>> d.insert(Character('w', italic=True))
>>> d.insert(Character('o', italic=True))
>>> d.insert(Character('r', underline=True))
>>> d.insert('l')
>>> d.insert('d')
>>> print(d.string)
he*l*lo
/w/o_rld
>>> d.cursor.home()
>>> d.delete()
>>> d.insert('W')
>>> print(d.string)
he*l*lo
W/o_rld