indentation - Python 2.7.3 IndentationError: expected an indented block - cant find mistake -

i new python , trying submit hw on coursera data science course. environment there vm running python 2.7.3, file tweet_sentiment.py trying run has following script within it:

import sys import json  def hw():     print 'hello, world!'  def lines(fp):     print str(len(fp.readlines()))  def main():     sent_file = open(sys.argv[1])     tweet_file = open(sys.argv[2])     # hw()     # lines(sent_file)     # lines(tweet_file)      myfile = open(sys.argv[1], 'r')     lines = myfile.readlines()     mydict = {}     line in lines:     key, value = line.split("\t")         mydict[key] = int(value)      twit_file = open(sys.argv[2], 'r')     twit_lines = twit_file.readlines()      mylist = []     line in twit_lines:     mylist.append(json.loads(line))      listik in mylist:     twit_value = 0     twit_text = listik["text"]     twit_words = twit_text.split()     word in twit_words:         if word in mydict:         twit_value =  twit_value + 1     print float(twit_value)   if __name__ == '__main__':     main() 

when running $ python tweet_sentiment.py getting following error:

    file "tweet_sentiment.py", line 25     key, value = line.split("\t")       ^ indentationerror: expected indented block 

thanks hints! sergey

be careful! you're mixing tabs , spaces indenting.

often tab displayed equivalent of 8 spaces. so, when using common practice of 4 spaces looks 2 levels of indentation, one.

when examine code in editor, can see you've got in @ least 2 places. replace tabs 4 spaces.