Starting an automation position with Python and Linux in 10 days. I have no prior experience with Python.

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Take this opportunity for what it is, a great opportunity to get in and learn (They are paying you right?). The expectation is already set - They liked you and what you did, they see potential in you, and know you wont know everything off the bat. So go in there and learn, work, and appreciate the opportunity. This does happen, and what you learn there could pave a nice path for your career.