California Kingsnake. Quite harmless.
I'd have invited him to stay as a pet.
If it really was 12" inches long then it is a young snake but unless it hatched way out of season it has probably been out and about on its own for nine months or so (kingsnakes generally hatch late summer/early fall) so you probably don't need to worry about a mom being around (plus, though I don't know for sure that this is true of kingsnakes, parental care is uncommon among snakes). If it was a recent hatchling you should be more concerned about the fact that there were probably another 5-15 eggs (oops, that probably didn't help).
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