That's what the name, Python, means, 'deceiver.' It's something inside us.
I don't think it's srictly inside of us. We do inherit a somewhat rebellious nature from Adam. But Jesus telling his decisciples that Satan had asked to sift them like wheat, isn't a reference to his disciples internal desires.
Likewise, in the Revelations to the apostle John, Satan's cast into the lake of fire along with the angels and people who followed him. Again, that doesn't look in any way shape or form to be an allegory of our wrong internal desires being destroyed. That changing of desires is something that happens through a process here on earth and then is completed and perfectedwhen we are changed at either death or the rapture, when we see Jesus as He is. So the casting of Satan and the rebellious angels into the lake of fire appears to be something completely different.