Thanks - this was very helpful. The SAGE programming guide could use the exact examples above pasted in, perhaps in a 2.1.1 or 4.3.1.1 "Testing reminders for novice programmers" - it makes it clear that the importing has to happen in the file itself, not the example, and also makes clearer what the difference between the .sage and .py files is, which was previously a little mysterious to me.
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