Numbers to word converter class

class NumToWord(object):
	"""NumToWord is a class for generating the word representation of a number"""
	def __init__(self, number):
		super(NumToWord, self).__init__()
		self.number = int(number)
		self.placeHolders = {1: " Thousand ", 2: " Million ", 3: " Billion ", 
							4: " Trillion ", 5: " Quadrillion ", 6: " Quintillion "}

def convToWord(self):
		wordrep = ""
		splitSize = 3

chunks = __splitToChunk__(str(self.number)[::-1], splitSize)
		chunksize = len(chunks)
		print chunks
		for i in xrange(chunksize - 1, -1, -1):
			#print i
			threedigno = int(chunks[i])
			hun = threedigno/100
			#print threedigno, i
			if hun > 0:
				#print __getWordRep__(hun)
				wordrep+=(__getWordRep__(hun))
				wordrep+=" Hundred"

ten = threedigno % 100
			#print ten
			if (ten > 0 and i == 0):
				if (hun > 0 or chunksize > 1):
					wordrep+=" and "
			elif (ten > 0 and i > 0 and hun > 0):
				wordrep+=" and "

if (ten > 10 and ten <= 19):
				wordrep+=(" "+__getWordRep__(ten))
				#wordrep+=" "
			else:
				ten = ten/10
				if (ten > 0):
					wordrep+=(__getWordRep__(ten * 10))
					#wordrep+="-"

unit = int((threedigno % 100) % 10)
				#print unit
				if (unit > 0 and ten > 0):
					wordrep+="-"

#print unit
				if(unit > 0):
					#print unit
					wordrep+=__getWordRep__(unit)
					#wordrep+=" "
			#print threedigno
			try:
				if threedigno > 000:
					#print threedigno
					wordrep+=self.placeHolders[i]
			except KeyError, e:
				wordrep+=""
				pass
				#raise e
		return wordrep+"."

def __getWordRep__(number):
	reps = {1: "One", 2: "Two", 3: "Three", 4: "Four", 5: "Five", 6: "Six",
			7: "Seven", 8: "Eight", 9: "Nine", 10: "Ten", 11: "Eleven", 12: "Twelve",
			13: "Thirteen", 14: "Fourteen", 15: "Fifteen", 16: "Sixteen", 17: "Seventeen", 
			18: "Eighteen", 19: "Nineteen", 20: "Twenty", 30: "Thirty", 40: "Forty",
			50: "Fifty", 60: "Sixty", 70: "Seventy", 80: "Eighty", 90: "Ninty"}
	return reps[number]

def __reverserStr__(stri):
	return stri[::-1]

def __splitToChunk__(string, chunksize):
	origstringlen =  len(string)
	chunks = []
	for i in xrange(0, origstringlen, chunksize):
		c = __reverserStr__(string[i:min([origstringlen, (i + chunksize)])])
		chunks.append(c)
		print i, c, min([origstringlen, (i + chunksize)])
	#print chunks
	return chunks

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