IndentationError: expected an indented block but it's there

Question

Having a problem getting a py script to execute. Got this error:

File "/scripts/blockIPv4.py", line 19
 ip = line.split(';')[0]
 ^
IndentationError: expected an indented block

I'm perplexed because the code that the error refers to *is* indented:

with open('/var/www/html/mydomain.com/banlist.txt','r') as inFile:
 for line in inFile.readlines():
 ip = line.split(';')[0]
 output = os.popen( '/etc/sysconfig/iptables -A INPUT -s ' + ip + ' -j REJECT' )
 logFile.write(ip+' - Has been blockedn')

What am I missing here?

Answer 1

Whenever you get perplexing indentation errors, suspect an inconsistency due to mixed tabs and spaces.

Tabs good. Spaces good. Tabs and spaces together, bad. You can run the tabnanny module over your source code:

python -m tabnanny 

to convert indentation to all spaces.

Answer 2

Indentation has to be consistent. likely the for line is indented with spaces and the next line with a tab. You can use tabs and spaces, but you have to be consistent with how you use them. IE if level 1 is indented with spaces, then level 2 has to be indented with spaces up to level 1 as well. Hope that makes sense.