Problem running a Python program, error: Name 's' is not defined [duplicate]

Answer 1

When you enter data for input() in Python 2, you're entering a Python expression. Whatever you're typing

1. Looks like an expression -- not a literal.

2. Has an S in it (hence the undefined variable.)

Either

• put your strings in quotes or

• stop using input() and use raw_input()

• stop using Python 2.6.

It's not clear what "I have Python 3 installed, but the program is being interpreted by Python 2.6." means. If it's installed, why isn't it being used? What's wrong with your PATH?