raw_input() was used in old versions of Python that is 2.x
If you are coding in PC check which version of Python is installed.
If your version in 3.x you can use simply input() in the place of raw_input().
Happy codding..
24th Nov 2016, 5:17 AM
Anil Krishna Raj
+ 1
Certify you're using python 2.7, raw_input() was removed on python 3+.