There is an indentation error that says expected an indented block

[leiel huang]

There 's a indentation error but i don't know what's wrong with it.
the error says

File "./class_question. py", line 12
self.dic = [] #array of hash tables for input data
^
IndentationErro r: expected an indented block

#! /usr/bin/env python

class Question:
	#constructor	
	dic
	questions
	answers
	qANDa
	vspace
	
	def __init__(self):
   	self.dic = []			#array of hash tables for input data
   	self.questions = []	#array for all questions
   	self.answers   = [] 	#array for corresponding answers    
   	self.qANDa		= []	#array of hash tables
   	self.vspace 	= "0.4in "
    
   def getRestrictions(self,filename):
   	print "Processing",filename
   
   def addquestion(self,questionstring):
	   self.questions.append(questionstring)
		
	def addanswer(self,answerstring):
		self.answers.append(answerstring)
		
	def addqANDa(self,questionstring, answerstring):
		dictionary = {}
		dictionary['question'] = questionstring
		dictionary['answer']   = answerstring	   
	   
	   self.qANDa.append(dictionary)
	
		
	def outputdata(filename):
		questionfilename = "files/"+filename +"_questions.tex"
		answerfilename   = "files/"+filename +"_answers.tex"
	
		questionFile  = open(questionfilename, "w")
		answerFile    = open(answerfilename, "w")		
		
		for ques in self.questions:
			questionFile.write(ques+"\n")
			questionFile.write("\\vspace{"+self.vspace+"}")
		
		for answ in self.answers:
			answerFile.write(answ)		

		questionFile.close();
		answerFile.close();

[bvdet]

Your indentation is not consistent. My preference is to use 4 spaces.

Also - you don't need the trailing semi-colons at the end.