Should I learn Python?

[Sam]

Hi, 
I have been developing sites and cms's for the past few years using
PHP and mysql. I've been interested in learning a new language and was
considering Python. I have a pretty decent grasp of OOP concepts (i
know, you're skeptical since I mentioned PHP). I don't have a formal
programming background, just learning as I go.

So, with that being said, here are some dumb questions.

1. What can I do with Python that I can't do with php? 

2. Do you use both PHP and Python in conjunction with each other?

3. In what way could I utilize Python to compliment existing sites or
apps built with PHP?

Thanks for any help.