Raspberry pi 'Response IndentationError'
Question: I have been looking at a tutorial on how to send sms texts through the rasp
pi. Here is the code that I have and I'm not sure why I have an error.

    
    
    #!/usr/bin/python 
    #----------------------------------- 
    # Send SMS Text Message 
    # 
    # Author : Matt Hawkins 
    # Site : http://www.raspberrypi-spy.co.uk/ 
    # Date : 30/08/2012 
    # 
    # Requires account with TxtLocal 
    # http://www.txtlocal.co.uk/?tlrx=114032 
    #  
    #----------------------------------- 
    
    # Import required libraries 
    import urllib # URL functions 
    import urllib2 # URL functions 
    
    # Define your message 
    message = 'Test message sent from my Raspberry Pi' 
    
    # Set your username and sender name. 
    # Sender name must alphanumeric and 
    # between 3 and 11 characters in length. 
    username = 'jonfdom1@aol.com' 
    sender = 'Jonny.D' 
    
    # Your unique hash is available from the docs page 
    # https://control.txtlocal.co.uk/docs/ 
    hash = '8fe5dae7bafdbbfb00c7aebcfb24e005b5cb7be8' 
    
    # Set the phone number you wish to send 
    # message to. 
    # The first 2 digits are the country code. 
    # 44 is the country code for the UK 
    # Multiple numbers can be specified if required 
    # e.g. numbers = ('447xxx123456','447xxx654321') 
    numbers = ('447xxxxxx260') 
    
    # Set flag to 1 to simulate sending 
    # This saves your credits while you are 
    # testing your code. 
    # To send real message set this flag to 0 
    test_flag = 1 
    
    #----------------------------------- 
    # No need to edit anything below this line 
    #----------------------------------- 
    
    values = {'test' : test_flag, 
    'uname' : username, 
    'hash' : hash, 
    'message' : message, 
    'from' : sender, 
    'selectednums' : numbers } 
    
    url = 'http://www.txtlocal.com/sendsmspost.php' 
    
    postdata = urllib.urlencode(values) 
    req = urllib2.Request(url, postdata) 
    
    print 'Attempt to send SMS ...' 
    
    try: 
    response = urllib2.urlopen(req) 
    response_url = response.geturl() 
    if response_url==url: 
    print 'SMS sent!' 
    except urllib2.URLError, e: 
    print 'Send failed!' 
    print e.reason
    

And here is the error message I have popping up on the terminal

    
    
     File "send_sms.py", line 331
        response = urllib2.urlopen(req) 
               ^
    IndentationError: expected an indented block
    


Answer: Python requires proper indentation, like this:

    
    
    try: 
        response = urllib2.urlopen(req) 
        response_url = response.geturl() 
        if response_url==url: 
            print 'SMS sent!' 
    except urllib2.URLError, e: 
        print 'Send failed!' 
        print e.reason
    

Here's [a section on Python indentation from Dive Into Python
3](http://getpython3.com/diveintopython3/your-first-python-
program.html#indentingcode).

