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1. Its a human readable description of the job that can appear in places like the status bar, jobs list, etc.
2. No idea, that's not from calibre code, is it from a plugin you copied?
3. If it works, dont worry about it. That header appears to imply the file was generated by something called makepy that was itself running on python3, but that may not mean that the generated file actually requires python 3
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