Upload slot allocation and finalize
Review this Python function that allocates a temp upload slot, writes parts, then finalizes.
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1def upload(parts):
2 slot = storage.create_slot() # reserves quota, returns handle
3 for p in parts:
4 if not p.valid():
5 return {"error": "bad part"} # bail out
6 storage.write(slot, p)
7 storage.finalize(slot)
8 return {"ok": True}
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