Initializing with the correct type

[aine_canby at yahoo.com]

Hi all,

I'm new to Python and I'm just wordering if my approch is correct.
Here's an example. I'm making sure that the length and types are
correct. This is in case I use such a class and accidently pass it the
wrong object.

class Funkt:
	'Funkt Class'

	def __init__(self, L):
		'Constructer, accepts a list L of ints, which is 1 or listLength in
length'
		if len(L) not in (1,listLength):
			errorString = "Format Error: L must be 1"
			if listLength != 1:
				errorString += " or "+str(listLength)
			errorString += " in Length"
			raise FormatError,errorString
		for i in L:
			if type(i) is not int:
				raise FormatError, "L must contain ints"


class FunktError(Exception):
	"Exceptions base class for FUnkt class"
	pass

class FormatError(FunktError):
	"Exception raised for wrong list length."

	def __init__(self, message):
	        self.message = message

	def __str__(self):
        	return self.message