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.