learning to program with Python

[Ricardo]

Hi, my name is Ricardo and i'm learning to program in Python with 
version 2.3.3, i'm also using the latest version of PythonWin(163) but 
i'm trying to do it with a book (Written in Portuguese) that covers the 
version 2.1, and of course i'm having a problem. The code in wich i'm 
having problems is as follows:

class Gato:
	"um felino domesticado"
	def __init__(self, sexo, corPelo=None):
		self.sexo = sexo
		if corPelo != None
		  self.corPelo = corPelo
	def miar(self):
		if self.sexo == "m":
			return "MIAU"
		else:
			return "miauuuu"
the book says that it should be done like this, but when i finnish the 
5th line(if corPelo != None) and press ENTER, it gives me the error:

  Traceback (  File "<interactive input>", line 5
     if corPelo != None
                       ^
SyntaxError: invalid syntax

I hope someone can help me?
Thanks in advance anyway.

Ricardo