Jumble sentences in paragraph(s)

sentence-jumbler

import os
import random
import collections

def jumbleSentences(paragraph):
	sentences = paragraph.split('. ')
	jumbledSentences = collections.OrderedDict()
	jumbleCounter = 0
	while jumbleCounter < len(sentences):
		position = random.randrange(0, len(sentences))
		if jumbledSentences.has_key(position):
			continue
		else:
			jumbledSentences[position] = sentences[position]
			jumbleCounter = jumbleCounter+1
	return jumbledSentences

def formatJumbledSentences(sentencesDict):
	output = ''
	index = 1
	for key, value in sentencesDict.iteritems():
		output = output+str(index)+'. '+value+'\n'
		index = index+1
	return output

def splitParagraphs(input):
	return input.split('\n')

outputFile = open('output.txt', 'wb+')
input = ''
if os.path.isfile('input.txt'):
	inputFile = open('input.txt')
	input = inputFile.read()
else:
	input = raw_input()

paragraphs = splitParagraphs(input)
output = ''
for paragraph in paragraphs:
	try:
		if paragraph[0].isdigit() or paragraph[0] is ' ':
			continue
	except:
		continue
	output = output+formatJumbledSentences(jumbleSentences(paragraph))+'\n\n'

outputFile.write(output)